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Final stages of the Brasiliano Orogenesis in SEBrazil: U-Pb and 40Ar/39Ar evidence for

overprinting of the Brasília Belt by the RibeiraBelt Tectonics

P. C. HackspacherInstituto de Geociências e Ciências Exatas,

Universidade Estadual Paulista, Av. 24 A, 1515, Rio Claro, SP, CEP 13506-900, Brazil

Email: [email protected]

A. H. FetterInstituto de Geociências e Ciências Exatas,

Universidade Estadual Paulista, Av. 24 A, 1515, Rio Claro, SP, CEP 13506-900, Brazil

W. TeixeiraCentro de Pesquisas Geocronológicas, Instituto de Geociências,

Universidade de São Paulo, Rua do Lago, 562, São Paulo, SP, CEP 05508-080, Brazil

E. L. DantasInstituto de Geociências,

Universidade Federal de Brasília, Brasília, DF, CEP 70910-900, Brazil

H. D. EbertInstituto de Geociências e Ciências Exatas,

Universidade Estadual Paulista, Av. 24 A, 1515, Rio Claro, SP, CEP 13506-900, Brazil.

R. A. J. TrouwInstituto de Geociências,

Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, CEP 21949-900, Brazil.

P. VasconcelosDepartment of Earth Sciences,

University of Queensland, Brisbane, Qld 4072 Australia.

Keywords: Brasiliano orogen, U-Pb, Ar-Ar, Ribeira Belt, Tectonics

Journal of the Virtual Explorer, 2004Volume 17

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http://virtualexplorer.com.au/

Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira

Belt Tectonics

Abstract: Around the southern margins of the São Francisco Craton, there is a zone oftectonic interference between the Brasília belt to the west and the younger Ribeira beltto the east. U-Pb monazite and 40Ar/39Ar cooling age determinations carried out in thearea reveal the cooling histories of these belts and the timing of tectonic overprint, un-raveling the final stages of Brasiliano Orogeny in SE Brazil. The U-Pb monazite datafrom migmatized paragneisses and late-stage pegmatites in the Socorro-Guaxupé NappeSystem of the southern Brasília belt show that migmatization peaked between ca. 613±1 and 607±3 Ma. 40Ar/39Ar biotite and muscovite ages of paragneisses and schists inthis area indicate that the northern high-grade core of the Nappe System (Guaxupé Do-main) was uplifted and cooled through the 350°C isotherm between 599±1 and 587±1Ma. In contrast, samples from the southern high-grade core of the Nappe System, theSocorro Domain, south of the Jacutinga shear zone, yields a broader and younger spec-trum of 40Ar/39Ar biotite ages between 571±1 and 562±1 Ma, attributed to a later upliftand cooling of the crust. The cooling ages can be assigned to local resetting of the 40Ar/39Ar system during transpressive tectonic overprint due to reactivation as a result ofcollision of the Ribeira belt. A younger group of 40Ar/39Ar mica ages (537±1 to 521±1Ma) in schists of the Socorro Domain, are associated with transpressional structuresof the Ribeira belt. Rock samples from the Jacutinga and Três Corações shear zones,yield 40Ar/39Ar biotite-muscovite ages around 520 Ma. These are typical cooling agesof the Ribeira belt, and are interpreted to mark the western limit of the Ribeira belttranspressional regime within the Brasília belt. The youngest biotite-muscovite coolingages in schists of the Socorro Domain, between 510±2 and 491±1 Ma, mark the finalcooling and exhumation of that part of the Brasília belt.


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Belt Tectonics


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Table of ContentsIntroduction ............................................................................................................................. 5Geologic Framework ............................................................................................................... 5Geochronology ........................................................................................................................ 8

U-Pb analyses .................................................................................................................... 840Ar/39Ar analyses ............................................................................................................. 9Samples and radiometric results .......................................................................................... 9U-Pb results ...................................................................................................................... 1140Ar/39Ar results ............................................................................................................... 13

Discussion and Conclusions .................................................................................................... 15Acknowledgements ................................................................................................................. 16References ............................................................................................................................. 16A. 40Ar/39Ar analytical data ..................................................................................................... 19


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Belt Tectonics

IntroductionThe Pan-African/Brasiliano Orogeny in South America

comprises a series of late Neoproterozoic to Cambrian mo-bile belts that formed during the assembly of West Gond-wana (e.g., Trompette, 1994). The belts are broadly coevalin their development, and tectonic aspects. Nevertheless,they are not completely simultaneous; hence structural andtectonic interferences related to either thrusting or trans-pression exist where they intersect each other. One well-exposed case of tectonic interaction is in southeasternBrazil where the Ribeira belt transects the Brasília belt, inthe southern margin of the São Francisco Craton. The in-teraction between these two mobile belts during the Brasi-liano Orogeny generated a complex array of structures(e.g., Ribeiro et al., 1995; Ebert and Hasui, 1998; Hack-spacher and Godoy, 1999; Campos Neto and Caby, 1999;Heilbron and Machado, 2003; Valeriano et al., 2004). It isgenerally accepted that the final collision of the Ribeira beltwas later than that of the southern Brasília belt (Hasui etal., 1990; Trouw et al., 2000; Campos Neto and Figueiredo,1995). However, to what degree the transpressional regimeof the Ribeira belt overprinted the Brasília belt rocks re-mains weakly constrained.

Accurate and precise radiometric ages are necessary toreconstruct the Brasiliano Orogeny and to better under-stand the regional geologic framework and major structuralfeatures of each belt. In order to correlate geologic, struc-tural and geochronologic features of the interference zone,we present new U-Pb monazite and 40Ar/39Ar mica datafrom selected granitoids, pegmatites, paragneisses andschists that crop out in the intersection between the Brasíliabelt and central part of the Ribeira belt. These data providethe first detailed age constraints on the late stage of meta-morphism, uplift and cooling of the southern Brasília belt,and reveal the thermal and structural overprint of the Ri-beira belt collision that led to assembly of West Gondwana.

Geologic FrameworkThe Neoproterozoic framework of the eastern part of

the South American Platform comprises mostly older cra-tons surrounded by Brasiliano-Pan-African mobile belts(Fig. 1). Convergence between the São Francisco – Congo,Amazonian and Rio de La Plata Cratons during the assem-bly of West Gondwana generated two major Neoprotero-zoic belts: the Brasília and Ribeira belts (see Cordani et al.,2000; and Heilbron et al., this volume, for a full description

of the geology of the belts). The Brasília belt resulted fromthe closure of the Goianides Ocean (e.g., Pimentel et al.,2000) along the western-southwestern margin of the SãoFrancisco Craton, and merges with the Borborema Prov-ince to the north (Fonseca et al., this volume), whereas theRibeira belt is associated with the closure of the AdamastorOcean to the east-southeast of the craton (e.g., CamposNeto, 2000). During oceanic closure, subduction gave riseto magmatic arc suites that preceded arc-continent andcontinent-continent collisions. A sequence of rocks wereinvolved in the amalgamation of West Gondwana includ-ing: Paleo- and Mesoproterozoic basement rocks and in-tracratonic successions; Neoproterozoic passive marginsuccessions; magmatic arcs of intraoceanic and active con-tinental margin settings with pre- and syn-collisional gran-itoids; late-orogenic sedimentary succession and posttectonic granites and pegmatites (e.g., Heilbron et al.,2004).

The Brasília belt in the region is mainly comprised of aNeoproterozoic passive margin metasedimentary succes-sion (Araxá and Andrelândia Groups), ( Table 1 ). TheAraxá Group comprises quartzite, schist and mafic rocks(Valeriano et al., 2004), whereas the Andrelândia Groupcontains paragneiss with amphibolite, quartzite, schist,gondite and calc-silicate rocks (Ribeiro et al., 1995; Pa-ciullo et al., 2000). Pimentel et al. (2004a, b) summarizedthe evolution of the Brasília belt and its relation to the GoiásMagmatic Arc ( Table 1 ), as follows: a) formation of in-traoceanic island arcs, Goiás Magmatic Arc, characterizedby calc-alkaline volcanic rocks and tonalitic to dioritic plu-tons, between 890-800 Ma; b) intrusion of mafic- ultra-mafic complexes in high metamorphism grade, probablylinked to a continental rift environment at ca. 800 Ma; c)high-grade metamorphism related to collision between thenorthern Goiás Magmatic Arc and the western border ofthe São Francisco proto-craton, between 770-760 Ma (Fer-reira Filho et al., 1994); d) period of igneous quiescencebetween 760-680 Ma; e) intrusion of tonalitic, granodior-itic, granitic and mafic-ultramafic bodies between 670 and600 Ma, considered by Junges et al. (2002) as the secondperiod of generation of tonalites and crustal accretion ofthe arc; f) peak of metamorphism in the Goías MagmaticArc associated with the final closure of the GoianidesOcean between ca. 630 and 600 Ma (Fischel et al., 1998;Pimentel et al., 2000; Piuzana et al., 2002); and g) coolingand regional uplift between 580-560 Ma (K-Ar, Pimentelet al., 2004b).


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Belt Tectonics

In the southern Brasília belt, closer to the Ribeira belt,the final oceanic closure (point f above) was associatedwith the development of significant eastward thrust ofnappes, towards the São Francisco Craton or tangential toit (Fig. 1, Table 1; Valeriano et. al, 2004). This Nappe Sys-tem (subdivided into the Guaxupé and Socorro Domains)represents a thick Neoproterozoic sheet composed of a pileof high grade metamorphic crustal rocks (Campos Neto andCaby, 1999; Campos Neto, 2000). Ages between 611 to604 Ma in the Socorro and Guaxupé Domains were inter-preted by Trouw and Pankhurst (1993) as a thermal peakassociated with the earlier thrusting and stacking of theNappe System. The Socorro-Guaxupé Domains were af-fected by a late- to post-orogenic magmatism between 630– 620 Ma (Töpfner, 1996) and 610 – 590 Ma (Janasi et al.,1993; Ebert et al., 1996; Töpfner, 1996; Wernick, 1998),respectively Numerous NE-trending, dextral, transcurrent-transpressive shear zones of the Ribeira belt (Ebert andHasui, 1998) overprint the Brasília belt thrust sheets, par-ticularly in the southern reworked margin of the São Fran-cisco Craton (Fig. 2, Table 1 ). This has also led to relativevertical displacement of the main Precambrian units of theRibeira along the Atlantic coast (Hackspacher and Godoy,1999; Heilbron et al., 2004).

Figure 2 and Table 1 show the studied area, with di-vision of the regional geology into tectonic units: a) the SãoFrancisco Craton, composed of Archean to Paleoprotero-zoic orthogneisses and migmatitic complexes; b) the Re-worked Cratonic Border, composed mainly of Archean toPaleoproterozoic tonalitic and granodioritic orthogneisses,strongly reworked during the Neoproterozoic; c) the Bra-sília belt and associated Metasedimentary Succession Do-main (Araxá and Andrelândia Groups), the Guaxupé andthe Socorro Domains; and d) the Central Ribeira belt (Heil-bron et al., 2004).

Like the Brasília belt, the Central Ribeira belt ( Figure1 ), across the states of Rio de Janeiro and São Paulo, is aresult of convergence between the São Francisco Cratonand some Neoproterozoic fragments, and the Congo Cra-ton. Collision processes resulted in the docking of distincttectonostratigraphic terranes, such as (see Heilbron et al.,this volume):

a. the Occidental terrane comprised of Paleoproterozoicbasement rocks;

b. Mesoproterozoic volcano-sedimentary successions;

c. Neoproterozoic units associated to: intra-oceanic arcs(Adamastor Ocean) and active continental margin set-tings (790 Ma to 585 Ma), as the Paraíba do Sul,Embu, Costeiro and the Oriental Terrane (Rio NegroMagmatic Arc), passive margin and back-arc litho-logical successions and syn-collisional granitoids re-lated to different collisional episodes; and

d. post-orogenic sedimentary successions and related bi-modal magmatism of the Cabo Frio AllocthonousTerrane (520 Ma; Tupinambá et al., 2000, Heilbron etal., 2004, and this volume).

Geochronological studies in the Central Ribeira belthave shown that the closure of the Adamastor Ocean wasa protracted process. The evolution of the Rio Negro Mag-matic Arc started as early as 790 Ma ago (Heilbron andMachado, 2003). The earliest collisional stages followed,between 640 to 620 Ma, with west-verging thrusting to-wards the São Francisco Craton. Sediments of the SãoRoque Group were deposited 610 Ma in a back-arc basin(Hackspacher et al., 2000). Major collision of the Ribeirabelt with the Sao Francisco Craton was accompanied by animportant tectono-thermal event dated between 590 and565 Ma (Machado et al., 1996), interpreted to be associatedwith thrusting and development of dextral shear zones. Inaddition, the tectonic history of the Ribeira belt includes animportant escape tectonic event, with transpressional char-acter, juxtaposing different crustal levels (amphibolite andgreenschist facies), along NE-trending shear zones. Thisevent took place between 600 and 580 Ma ago, as con-strained by U-Pb age of post-kinematic syenitic rocks(Töpfner, 1996; Hackspacher and Godoy, 1999). Verticalmovement during this event led to the exhumation of theBrasília and Ribeira belt rocks, with erosion and continen-tal sedimentation in small NE-trending basins developedbetween 570-540 Ma (Teixeira et al., 1999; Zanardo andOliveira, 1990).

Subsequent thrusting and development of shear zonesoccurred in the Central Ribeira belt between 535 and 520Ma, during the postulated docking of the Cabo Frio terrane(Schmitt et al., 1999) to the Oriental terrane in the easternpart of the belt. The late-stage magmatism related to thisdocking took place between 503 and 492 Ma (Wiedemann1993, Machado et al., 1996, Schmitt et al., 1999).


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Figure 1. Precambrian framework of Western

Gondwana

Precambrian framework of Western Gondwana with thelocation of the studied area; the southern Brasília belt.(modified from Trompette, 1994): 1- Phanerozoic ba-sins; 2- Neoproterozoic Cratons: SF- São Francisco,LA- Luis Alves, RP- Rio de La Plata, C- Congo, K- Ka-lahari; 3- Neoproterozoic mobile belts: B- Brasília, A-Araçuaí, R- Ribeira. Locality: CF: Cabo Frio.

Figure 2. Geologic map of SE Brazil

Geologic map of SE Brazil (modified after CPRM, 2002)with U-Pb and 40Ar/39Ar sample locations and numbers.


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Belt Tectonics

Table 1. Tectonic units of the southern Brasília belt

(Valeriano et al., 2004) and Ribeira belt, as well as the

regional shear zones.

Geologic

Period

Brasília

Belt

Re-

worked

Craton

Border

Central

Ribeira

Belt

Tectonic

Process

Neopro-terozoic

Jacutinga / Ouro Fino /Três Corações shearzones

Trans-pression520 Ma

Cabo FrioTerrane

Collision520 Ma

Jacutinga / Ouro Fino /Três Corações shearzones

Trans-pression580-520Ma

CosteiroTerrane

Collisionca. 580Ma

Passive Margin Sedi-mentation: Araxa andAndrelania Groups

Granulitic nappes:Guaxupe and Socorrodomains

São Ro-gue GroupEmbuTerraneOcciden-tal Ter-raneOrientalTerrane(Rio Ne-gro Arc)Paraiba doSul

Collisionca. 620Ma

GoiásMagmaticArc

770 Ma

Meso/Pa-leoproter-ozoic



Paleopro-terozoic/Archean



Geochronology

U-Pb analyses

Initial preparation of monazite crystals for isotopic anal-ysis was done at Department of Petrology and MetallogenyState University of São Paulo (UNESP), Brazil. Singlemonazite crystals, spiked with a 205Pb-235U tracer solution,were dissolved in 7 ml Teflon Savillex beakers using a sol-ution of concentrated ultra pure H2SO4 (5 uL), 6M HCl(40 uL) and 7M HNO3 (40 uL). Dissolution of the monazitewas achieved by placing the beakers on a conventional hotplate (at 125-140oC) for 24 hours to ensure complete dis-solution. Samples were then partially dried, as the H2SO4is difficult to evaporate, and conditioned with 3.1M HClprior to microcolumn chromatography, adapted fromKrogh (1973). Isotopic ratios were measured at GeoscienceInstitute, National University of Brasília (UnB), Brazil, us-ing a Finnigan MAT multi-collector mass spectrometerequipped with an ion counting system.

Eleven samples of prismatic monazite were analyzedfor both Pb and U isotopic compositions on single Re fil-aments using silica gel and phosphoric acid. The analyseswere corrected for average mass discrimination of 0.12 ±0.05% per mass unit for multi-collector analyses (based onreplicate analyses of common Pb standard SRM 981). Ura-nium fractionation was monitored by replicate analyses ofSRM U-500. Uncertainties in U-Pb ratios due to uncer-tainties in fractionation and mass spectrometry werearound ± 0.5%, as all signals measured were relativelystrong. Radiogenic Pb isotopes were calculated by correct-ing for modern blank Pb and for original no radiogenicoriginal Pb corresponding to Stacey and Kramers (1975)model Pb for the approximate age of the sample. Uncer-tainties in radiogenic Pb ratios in the studied samples aretypically ± 0.1%. Decay constants and isotopic ratios usedin the age calculations are those listed by Steiger and Jäger(1977). Total procedure blanks over the course of analysesranged from 10 to 46 pg for lead and 0.5 to 2 pg for uranium.The U-Pb monazite data (see Table 3 ) were regressedusing the ISOPLOT/EX program of Ludwig (1999). Forboth samples, forced Model 1 regressions were performedas the analytical points were either concordant or nearlyconcordant with little spread in the data. Uncertainties inconcordia intercept ages are given at the 2s level (Fig. 5).


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40Ar/39Ar analyses

Transmitted- and reflected-light microscopy of polish-ed thin sections were used to determine the mineralogy andtextures of datable samples. Samples were then crushedand suitable minerals (well-formed biotite and muscovitegrains) were concentrated and hand-picked under a binoc-ular microscope. The mineralogical study was conductedat the Geochronology Laboratory of the State Universityof São Paulo (USP) and at the Department of Geology ofthe Federal University of Rio de Janeiro (UFRJ), Brazil.The 40Ar/39Ar geochronology (see Vasconcelos et al.,2002) was carried out at the Geochronological ResearchCenter (CPGeo) at the University of São Paulo, Brazil. Thelaboratory facility comprises two major units: a home builtfully automated noble gas stainless steel ultra-high vacuumgas extraction and purification system, coupled with a con-tinuous laser, and the MAP-215-50 mass spectrometer. Theargon routine is limited to grains smaller than 2.1 mm, sincethis is the maximum diameter of the wells in the samplealuminum disks used for irradiation. Five to ten grains fromeach sample were loaded into these disks along with FishCanyon sanidine standards (28.02 ± 0.28 Ma; Renne et al.,1998). The disks were wrapped in aluminium-foil, sealedin silica glass tubes and irradiated for 30 hours at the IPEN/CNEN IEA-R1 nuclear reactor, São Paulo, Brazil.

The samples were analyzed after cooling by the laserincremental heating, following procedures detailed by Vas-concelos et al. (2002). Argon isotope ratios (40Ar/39Ar,38Ar/39Ar, 37Ar/39Ar, 36Ar/39Ar, 40Ar*/39Ar), the percent-age of radiogenic argon (40Ar*), the age obtained for eachincremental heating step (identified with a letter after thegrain number), J factors, laser beam intensity, 40Ar/36Ardiscrimination, correction factors, and full system blanksare shown in the Appendix 1. The calculation of 40Ar/36Ardiscrimination (McDougall and Harrison, 1999), was ob-tained by the measurement of the 40Ar and 36Ar isotopesfrom the air pipette of the extraction line, in order to ac-count correcting factors for the production of interferingisotopes (36Ar, 37Ar, 38Ar, 39Ar, and 40Ar) from Ca and Ksalts and glasses during sample irradiation. Full systemblanks correspond to the masses of 40Ar, 39Ar, 38Ar, 37Ar,and 36Ar present in the extraction line and mass spectrom-eter. The 40Ar/39Ar incremental heating analyses on threesingle grains from each sample (triplicate analysis) haveprovided plateau, ideogram and integrated ages (see Table4 ). The plateau ages represent continuous steps (more than50%) of the total 39Ar released from a sample and for which

no difference in age can be detected between any two frac-tions at the 95% confidence level (Fleck et al., 1977). Alluncertainties in plateau, integrated, and weighted meanages are given at 2s level. When the plateau ages showedcomparable individual results within error, the resultingage-probability ideogram is taken as a robust estimate ofthe samples’ age (weighted mean age). Figure 3B containssome examples of weighted mean age corresponding toideograms. Contrastingly, when the plateau ages are sig-nificantly different they indicate a complex thermal historyof the sample. In these cases the range between the singlegrain ages has been considered realistic ( Table 4 ; H693Cand HFT361), as additionally supported by the new U-Pbmonazite ages and the regional geochronologic back-ground.

The 40Ar/39Ar ages (Ideogram/Integrated) are plotted inFig. 3B which presents the different domains of the Brasíliaand Ribeira belts, north and south of the Jacutinga shearzone. Figure 6 shows four selected 40Ar/39Ar analyses foreach domain distinguished in the area, whereas Table 4presents the age variation of the ideograms for the selectedgroup of samples. These ideograms display the thermalhistory against time within the selected domains.

Figure 3. Geologic map of SE Brazil

Geologic map of SE Brazil (modified after CPRM, 2002)showing: A) U-Pb monazite ages; B) 40Ar/39Ar biotiteand muscovite ages (bold numbers). Symbols as in Fig-ure 2. Compare with Fig. 2 for sample numbers.

Samples and radiometric results

The timing of late collisional stages of the southernBrasília belt have been derived from U-Pb analyses ofmonazite grains and 40Ar/39Ar analyses of muscovite andbiotite of high-grade paragneisses, schists, migmatites andlate-tectonic pegmatites from the Reworked Cratonic Bor-der, Socorro-Guaxupé Nappe System and the


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Belt Tectonics

Metasedimentary Succession Domains of the Brasília andRibeira belts (Heilbron et al., 2004). Monazite age is usedto date peak metamorphism (De Wit et al., 2001; Foster etal., 2004; Gibson et al., 2004; Guillaume-Seydoux et al.,2002) interpreted to be related to the southern Brasília beltevolution, as supported by petrography and field inferen-ces. Ar-Ar is used to date thermal episodes (Noce et al.,2004).

All samples studied were taken from locations far fromthe recognized late sub-vertical shear zones (Jacutinga,Jundiuvira, Camanducaia, São Bento do Sapucaí, Campodo Meio and Três Corações shear zones; Fig. 2) to avoidlocal tectonic effects. These shear zones are related to theSocorro-Guaxupé Nappe System of the Brasília belt or tothe younger escape tectonic at the Central Ribeira belt.Twenty nine samples were analyzed by the 40Ar/39Ar meth-od whilst eleven of them by U-Pb method as well (samplelocations and descriptions are in Figs 2, 3 and Table 2 ).U-Pb monazite analyses are summarized in Table 3 , andconcordia diagrams are shown in Fig. 5. The 40Ar/39Ar agesare listed in Table 4 , whilst the complete analytical dataare shown in Appendix 1. Four plots of the 40Ar/39Ar datesillustrate the history of uplift and cooling for the studieddomains (Fig. 6A-D).

Figure 4. Field photographs

Field photographs. A) Paragranulite of the Guaxupé Do-main, sample H693; B to D) paragneisses of the SocorroDomain (samples HFT353, HFT349, H704 respective-ly); E) Schist interlayered with quartzites of the Metase-dimentary Succession Domain, sample H687.


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Belt Tectonics

Table 2. Sample Description

Sample Lithology Prove-

nance

Coordi-

nates

Analysis

Guaxupé Domain

HFT359 Banded,biotiteparagneiss

road be-tween Po-ços andMachadoMinasGeraisState- MG

21º 42'0.6"S, 46º22' 56"W

gneissicbanding(122/09)composedof narrowbands ofquartz,plagio-clase, bio-tite , K-feldsparand pris-maticmonazitecrystals

HFT361 Augengneiss

road be-tween Ma-chado andPousoAlegre-MG

21º 42'52"S, 45º55' 35"W

gneissicbanding(80/10)and thrustsense towest com-posed byK-feld-spar por-phyro-blasts in aquartz-feldspath-ic matrix,biotite andwellformedmonaziteas acces-sory min-eral

H693 Paragra-nulite(Fig. 4A)alternat-ing withkinzigiteand meta-basite

road Var-ginha-CarmoCa-choeira-MG, at theSanto An-tônioquarry

21º 33'25"S, 45º22' 07"W

gneissicbanding(232/11)andstretchinglineation(252/8)with trans-port senseto north-east. It iscomposedby K-feld-spar, gar-net, kyan-ite and hy-persthene,biotite andprismaticmonazite

H465 Schist al-ternatingwithquartziteand granu-litic gneiss

road be-tween Par-aguaçuand Vargi-nha-MG

21º 22'51"S, 45º30' 20"W

foliation(172/12)composedby quartz,biotite andK-feld-spar

H559 Schist in-tercalatedwithquartziteand calc-silicate

road 381betweenTrês Cora-ções andCarmo daCa-choeira-MG

21º 33'37"S, 45º08' 16"W

foliation(212/15).It is com-posed byquartz, bi-otite, K-feldsparand mus-covite

H690 Schist ,gneiss andamphibo-lite

road Cam-buquira-Três Cora-ções-MG

21º 45'21"S, 45º14' 18"W

foliation.It is com-posed bybands ofquartz, K-feldspar,plagio-clase andbiotite .Amphibo-lite bou-dins arestretchedalong themainbanding

Socorro Domain

H616 Pegmatitecutting amigmatit-ic para-gneiss

road be-tween Ita-jubá andPedralva-MG

22º23'54''S,45º32'00''W

gneissicbanding(175/10)andstretchinglineation(182/8)with trans-port senseto north,composedby K-feld-spar, pla-gioclase,biotite andprismaticmonazite ;

FCS11B Pegmatitecuttinggranitoid

road be-tweenJundiaíand Itu-SP

23º17'53''S,47º02'60''W

Granitoidwith anequigra-nular tex-ture com-posed byquartz,plagio-clase, bio-tite and K-feldspar,and pris-maticmonazitecrystals

HFT353B Para-gneiss(Fig. 4B)with mig-matiticfeatures

road be-tweenCambuíand PousoAlegre-MG

22º 31'23"S, 46º01' 25"W

gneissicbanding(105/08),composedby bandsof K–feld-spar, pla-gioclase,biotite andgarnetcrosscutby quartz-feldspath-ic pegma-tite. Thesampleshowsprismaticmonaziteprismaticbiotitegrains.

HFT349 Para-gneiss(Fig. 4C)and schist

road be-tween SãoBento doSapucaíand Parai-sópolis-MG

22º 44'29"S, 45º44' 21"W

gneissicbanding(117/11)and asym-metric iso-clinal foldwith axisplunging 5degrees toNNE andfoliationparallel tobanding,composedby narrowbands ofquartz,plagio-clase, bio-tite, K-feldsparand gar-net. Thesampleyieldedsome pris-maticmonaziteand biotitegrains

H751 Schist ,paragneissand mig-matite

road be-tween Sa-pucaí-Mirim andSão Bentodo Sapu-caí-MG

22º 38'34"S, 45º44' 58"W

foliation(147/52)composedby quartz,K-feld-spar, bio-tite andmusco-vite. Thesampleyieldedprismaticbiotitegrains.

HFT704B Pegmatite(Fig. 4D)related tointrusivegraniteand or-thogneiss

road SP 65betweenBom Jesusdos Per-dões andNazaréPaulista-SP

23º10'15''S,46º 23'24''W

gneissicbanding(137/43)withstretchinglineation(135/40)and NWsense ofthrusting.The or-thogneissis com-posed byplagio-clase, K-feldspar,biotite andis intrudedby granitewith K-feldspar,plagio-clase andbiotite.The sam-ple yiel-ded well-formedmonazitegrains.

H355 Augengneiss

road BomRepousoto Bordada Mata-MG

22º 22'06"S, 46º08' 30"W

gneissicbanding(123/13),composedby K-feld-spar pro-phyro-blast in aquartz-feldspath-ic matrix.The sam-ple yiel-ded well-formed bi-otitegrains

H351 Para-gneiss

road be-tween Par-aisópolisand Con-solação-MG

22º 32'34"S, 45º50' 38"W

gneissicbandingcomposedby smallbands ofquartz,plagio-clase, bio-tite and K-feldspar

Reworked Cratonic Border

HFT363B Pegmatit-ic veinscuttingparagneisswith mig-matiticfeatures

Sindicatoquarry atthe roadbetweenBorda daMata andOurofino-MG

22º 16'45"S, 46º10' 55"W

banding(137/05),composedby bandsof quartz,plagio-clase, bio-tite and K-feldsparandquartz-feldspath-ic pegma-tite. Am-phiboliteboudinsarestretchedalong themainbanding.Biotite ,muscoviteand raremonazitecrystalsare wellpreserved

H681 Para-gneisswith mig-matiticportions

road Pou-so Alegre-Silvianóp-olis-MG

22º 05'35"S, 45º53' 32"W

gneissicbanding(225/20)andstretchinglineation(230/70),composedby K-feld-spar, pla-gioclase,biotite andgarnet.The sam-plepresentwellformed bi-otite andmonazitecrystals

HFT358 Granitoid(syn topost-tec-tonic)

road be-tweenBorda daMata andIpuíuna-MG

22º 05'59"S, 46º10' 57"W

equigra-nular tex-ture com-posed byquartz,plagio-clase, bio-tite and K-feldspar.The sam-plepresentwellformed bi-otite crys-tals

HFT356 Schist in-tercalatingwithgneiss andmigmatite

road be-tween Ja-cutingaand Ouro-fino-MG

21º 03'03"S, 46º08' 37"W

foliation( 172/74)composedby quartz,biotite, K-feldsparand mus-covite

Metasedimentary Sucession Domain

H687 Pegmatitecuttingmetasse-diments(Fig. 4E)in am-phibolitefacies

road Cam-buquira-Lambari-MG

21º 53'29"S, 45º15' 46"W

foliation(340/10)andstretchinglineation(64/00),composedby K-feld-spar,quartz,muscoviteand biotitecrystals;The sam-plepresentwellformed bi-otite andmuscovitecrystals

LUME Schist ,quartziteand meta-conglom-erate ofthe Andre-lândiaGroup

road be-tween Lu-mináriasand Lav-ras-MG

21º 33'30"S, 44º57' 15"W

foliation( 272/15)composedby quartz,muscoviteand bio-tite. Thesampleyieldedprismaticmuscovitecrystals

ITMTR Schist ,quartziteand meta-conglom-erate ofthe Andre-lândiaGroup

road be-tween Lu-mináriasand Lav-ras-MG

21º 21'00"S, 44º52' 00"W

foliation(179/13)composedby quartz,muscoviteand bio-tite. Thesampleyieldedprismaticmuscovitecrystals

MN85 Schist ,quartziteand meta-conglom-erate ofthe Andre-lândiaGroup

road be-tweenTrês Cora-ções andSão Bentodo Abade-MG

21º 40'20"S, 44º57' 34"W

foliation(269/10)composedby quartz,muscoviteand biotite

MR72 Schist andquartziteof the An-drelândiaGroup

road be-tween SãoBento doAbade andLuminá-rias-MG

21º 40'20"S, 44º57' 00"W


CAR1 Schist ,quartziteand meta-conglom-erate ofthe Andre-lândiaGroup

road be-tween SãoJoão DelRei andSão Tia-go-MG

21º 27'00"S, 44º34' 00"W

foliation( 315/35)composedby quartz,muscoviteand biotite

DIT Schist andquartziteof the An-drelândiaGroup

road be-tweenLavrasand SãoJoão DelRei-MG

21º 33'00"S, 44º24' 45"W


ANDT Schist ,quartziteand meta-conglom-erate ofthe Andre-lândiaGroup

road be-tween Ma-dre deDeus deMinas eAndrelân-dia-MG

21º 45'00"S, 44º18' 00"W


FDA Schist ,quartziteand meta-conglom-erate ofthe Andre-lândiaGroup

road be-tween Ma-dre deDeus deMinas eAndrelân-dia-MG

21º52'15''S,44º15'35''W


Ribeira belt

H513B Pegmatitecuttingsyntecton-ic granite

at Ibiúna-SP

23º 43'53''S; 47º24' 26''W

equigra-nular tex-ture com-posed byquartz,plagio-clase, bio-tite and K-feldspar,and wellformedmonazitecrystals

H109 Schist ,paragneissand mig-matite

roadBR-116betweenItatiaiaand Re-sende-RJ

21º 33'37"S, 45º08' 16" W

foliation(177/45)composedby quartz,biotite , K-feldsparand mus-covite

U-Pb results

The oldest populations of monazite were found in theGuaxupé Domain. U-Pb age determinations of monazitegrains from a single sample of migmatite (HFT 359, Figs3A, 5A and Table 3) yield a discordant age of around 642±1 Ma. This age represents an early generation of monazitegrowth related to an early metamorphic event. This eventis roughly contemporaneous to that in the Socorro Domain,associated with the pre-collisional granites of Hackspacheret al. (2003).

Figure 5a. U-Pb concordia diagrams

U-Pb concordia diagrams of monazite data from para-gneisses. migmatites and pegmatites in the southernpart of the: Brasília belt, Guaxupé Domain:

a. HFT359

b. HFT361

c. H693A.

d. Socorro Domain: H616,

e. FCS-11B,

f. HFT353B,


Paper 2



Belt Tectonics

Figure 5b. U-Pb concordia diagrams

U-Pb concordia diagrams of monazite data from para-gneisses. migmatites and pegmatites in the southernpart of the: Brasília belt, Guaxupé Domain:

g. HFT349,

h. H704B.

i. Reworked Cratonic Border: HFT363B,

j. H681.

k. Ribeira belt: H513B.

Granulites, migmatites and paragneiss leucosomes ofboth the Guaxupé and Socorro Domains (Brasília belt)yield concordant ages between of 620±2 Ma, sample HFT359, Guaxupé Domain, and 625±1 Ma, sample H616, So-corro Domain (Figs 3A, 5D and Table 3). Nearly concord-ant U-Pb monazite ages between 613 and 607 Ma were alsofound (samples H693A, H361, FCS 11B, HFT 353, H 704,H 681, H513B in Figure 3 a, Figure 4 , Figure 5a andTable 3 ). Geological and textural evidence, such as mon-azite inclusions in garnet, suggest that these old monazitegrains grew during peak metamorphism (e.g., De Wit et al.,2001; Foster et al., 2004; Gibson et al., 2004; Guillaume-Seydoux et al., 2002). In the Brasília belt these early-formed monazite grains were found in high-grade rocksassociated with low angle shear zones, syn-collisional

granites, which may have re-homogenized the monaziteages of older migmatites and paragneisses.

One sample of pegmatite was dated. Pegmatites aremostly undeformed except for local boudinage and are in-terpreted to be late tectonic. They are intrusive into garnet-schists of the Andrelândia Group (MetasedimentarySuccession Domain), in the southern edge of the Brasíliabelt. This monazite sample yielded an almost concordantU-Pb age of 598±2 Ma (Fig. 5I, sample HFT363B).


Paper 2



Belt Tectonics

Table 3. U-Pb monazite data from the southern Brasília

belt

S

a

m

pl

e

P

b

2

0

6

P

b

2

0

7

*

± P

b

2

0

6

*

± C

o

r

r

el

.

P

b

2

0

7

*

± P

b

2

0

6

*

± P

b

2

0

7

*

± P

b

2

0

7

*

±

F

r

a

ct

io

n

W

t.

U P

b

P

b

2

0

4

U

2

3

5

2

σ

U

2

3

8

2

σ

C

o

ef

f.

P

b

2

0

6

*

2

σ

U

2

3

8

2

σ

U

2

3

5

2

σ

P

b

2

0

6

*

2

σ

(

m

g)

p

p

m

p

p

m

(

o

b

s.

)

% % (

r

h

o)

% A

g

e

(

M

a)

A

g

e

(

M

a)

A

g

e

(

M

a)

GuaxupéDomainHFT359

M(0.4A)2

0.018

4643

2459

12496

0.8564

0.28

0.1017

0.27

0.974

0.06108

0.06

624

2 628

2 642

1

M(0.5A)2

0.018

13357

6811

18461

0.8423

0.32

0.1010

0.32

0.994

0.06047

0.03

620

2 620

2 620

1

HFT361

M(0.5A)2

0.014

652

1113

1170

0.8276

0.90

0.0982

0.71

0.785

0.06114

0.55

604

5 612

4 644

12

M(0.5A)4

0.012

688

1449

1471

0.8207

1.19

0.0990

0.55

0.473

0.06010

1.05

609

7 608

3 607

23

H693A

M(0.5A)3

0.030

1962

1722

7371

0.8271

0.54

0.0996

0.53

0.990

0.06021

0.08

612

3 612

3 611

2

M(0.5A)4

0.020

3551

2075

7539

0.8271

0.72

0.0997

0.68

0.938

0.06019

0.25

612

4 612

4 611

5

SocorroDomainH616

M(0.5A)

0.009

2623

1207

20271

0.8502

0.19

0.1020

0.18

0.955

0.06044

0.06

626

1 625

1 620

1

M(0.55A)

0.012

2377

942

16748

0.8506

0.28

0.1020

0.27

0.972

0.06048

0.07

626

2 625

2 621

1

M(0.6A)

0.011

1739

1191

8341

0.8484

0.21

0.1020

0.21

0.960

0.06032

0.06

626

1 624

1 615

1

FCS11B

M(0.3A)"1"

0.008

4482

1571

2554

0.8069

0.76

0.0972

0.75

0.993

0.06021

0.09

598

5 601

5 611

2

M(0.3A)"2"

0.006

7218

2580

2611

0.8098

0.47

0.0977

0.46

0.980

0.06011

0.09

601

3 602

3 608

2

M(0.3A)"3"

0.008

2552

1051

2947

0.8185

0.56

0.0984

0.53

0.951

0.06033

0.17

605

3 607

3 615

4

HFT353B

M(0.4A)1

0.010

1574

1035

2149

0.8176

0.39

0.0984

0.33

0.868

0.06025

0.19

605

2 606

2 612

4

M(0.4A)2

0.024

1235

1184

3561

0.8087

0.37

0.0974

0.3

0.814

0.06020

0.21

599

2 602

2 611

5

M(0.5A)2

0.028

900

977

3400

0.8137

0.25

0.0980

0.2

0.828

0.06020

0.14

603

1 605

1 611

3

HFT349

M(0.4A)2

0.028

2234

1271

3453

0.8036

0.64

0.0970

0.63

0.980

0.06006

0.13

597

4 599

4 606

3

M(0.5A)2

0.026

5061

1564

13390

0.8165

0.46

0.0983

0.45

0.993

0.06027

0.05

604

3 606

3 613

1

H704B

M(0.6A)

0.008

2282

810

13662

0.8197

0.17

0.0989

0.17

0.988

0.06012

0.03

608

1 608

1 608

1

M(0.65A)

0.012

1808

640

22393

0.8215

0.21

0.0992

0.2

0.963

0.06007

0.06

610

1 609

1 606

1

M(0.70A)

0.015

1684

1002

16594

0.8439

0.19

0.1017

0.18

0.957

0.06016

0.06

625

1 621

1 609

1

ReworkedCratonicBorderHFT363B

M(0.4A)2

0.020

16685

3194

5545

0.8022

0.67

0.0971

0.66

0.992

0.05993

0.09

597

4 598

4 601

2

M(0.5A)2

0.026

9919

2109

8026

0.7983

1.28

0.0962

1.27

0.994

0.06017

0.15

592

8 596

8 610

3

H681

M(0.3A)

0.026

1184

491

1657

0.8146

0.50

0.0982

0.49

0.985

0.06016

0.09

604

3 605

3 609

2

M(0.5A)

0.009

1284

452

2074

0.8131

0.79

0.0981

0.57

0.745

0.06010

0.23

603

5 604

5 607

11

RibeiraBeltH513B

M(0.3A)"1"

0.010

989

1214

1645

0.8234

0.17

0.0995

0.16

0.953

0.06004

0.05

611

1 610

1 605

1

M(0.3A)"2"

0.010

1465

702

2737

0.8193

0.21

0.0990

0.21

0.994

0.06002

0.02

609

1 608

1 604

1

M(0.3A)"3"

0.004

1130

978

927

0.8185

0.36

0.0988

0.34

0.947

0.06010

0.12

607

2 607

2 607

3

40Ar/39Ar results

The study of monazite growth ages marking thermalpeak is complemented by the study of Ar-Ar cooling ages.This thermochronometer was used here to identify theoverprinting of the Ribeira belt deformation on the Brasíliabelt. In the northern portion of the Nappe System, north ofthe Jacutinga shear zone, in the Guaxupé Domain, 40Ar/39Ar data from biotite (Group 1 in Table 4 , Figure 3 B),yield a fairly tight cluster of cooling ages (plateau and ide-ogram), between 599±1 and 587±3 Ma (Fig. 6A, sampleHFT465). Muscovite sample (H559: 588±2 Ma) yieldssimilar ages to biotite. This indicates that the northern partof the Nappe System cooled to ~350 oC some 20-30 myrafter peak metamorphism.

In the southern portion of the Nappe System, south ofthe Jacutinga shear zone, 40Ar/39Ar biotite data show avaried cooling history. The oldest ideogram biotite agesyielded a value of 597±1 Ma (sample HFT355), similar tothe northern part of the Nappe System, and interpreted torepresent a relict of that cooling phase. The next oldestsample obtained in this region is younger, ranging between571±1 to 566±1 Ma (Group 2 in Table 4, Figs 3B, 6B sam-ple HFT358), and include muscovite age between 566-562Ma (Group 2 in Table 4 , sample HFT356).

A third group of samples south of the Jacutinga shearzone is associated with transpressional structures of theCentral Ribeira belt, such as the NE-SW trending sub ver-tical strike-slip Jacutinga and Três Corações shear zones,which separate the Guaxupé and Socorro Domains. Theyyield 40Ar/39Ar biotite ideogram ages from 527±1 to 521±1 Ma (Group 3 in Table 4, e.g. samples HFT353 H681and LUME, Figs 3B, 6C). The 40Ar/39Ar systematics in thisarea has been perturbed, as indicated by age spectra of thesample H687B that vary from 557±2 to 527±1 Ma. Theyoungest group of ages south of the Jacutinga shear zoneyield biotite/muscovite ideogram ages from 510±2 to 491±1Ma (group 4 in Table 4, Figs 3B and 6D sample FDA).Six 40Ar/39Ar cooling age determinations in the easternsector, near the boundary to the Ribeira Belt, show an agedistribution between 501±2 and 491±1 Ma (see for exam-ple FDA, ANDT in Table 4).

Thus, the age patterns in the Nappe System south of theJacutinga shear zone (Groups 2, 3 and 4), show that group3 samples from the Jacutinga and Três Corações shearzones are younger than elsewhere (group 2), while group4 probably reflects a new tectonic event. Their geographi-cal distribution, closer to the Ribeira belt boundary,


Paper 2



Belt Tectonics

suggests a possible late overprint. The cooling ages ofgroups 3 and 4 are interpreted to have been reset by motionon vertical shear zones south of the Jacutinga and TrêsCorações shear zones producing a range of younger ages.

Figure 6. Incremental heating analysis of single grains

40Ar/39Ar incremental heating analysis of single grainswith plateau ideogram and integrated graphics.

a. North of Jacutinga shear zone, sample HFT 465.View Figure 6a [fullsize] (above).

b. South of the Jacutinga shear zone, sample HFT358. View Figure 6b [fullsize].

c. South of Jacutinga shear zone, sample HFT 353.View Figure 6c [fullsize].

d. South of Jacutinga shear zone, sample FDA. ViewFigure 6d [fullsize].

See Table 4 for details.

Table 4. 40Ar-39Ar data (single grains; triplicate) from

the southern Brasília belt. See Table 2 for sample

details. Errors are given in 2s.

Sam-

ple

Rock

/Min-

eral

Lab # Pla-

teau 1

Pla-

teau 2

Pla-

teau 3

Ideo-

gram

Inte-

grat-

ed

USP Ages

(Ma)

Ages

(Ma)

Ages

(Ma)

Ages

(Ma)

Ages

(Ma)

Group 1-Northof Ja-cutin-gashearzone:northernpartof theSo-cor-ro-Guaxupédo-mains

HFT359

para-gneiss/bio-tite

1512 601±1

598±1

598±1

599±1

HFT361

augengneiss/bio-tite

1513 588±1

586±1

591±1

584±1

H693C

para-gran-ulite/bio-tite

1485 574±1

578±1

586±1

579±1

H465 schist/bio-tite

1489 586±1

589±1

585±1

587±1

H559 schist/mus-covite

1491 591±1

587±1

587±1

588±2

Group 2-Southof Ja-cutin-gashearzone

HFT355

augengneiss/bio-tite

1507 597±1

599±1

597±1

597±1

HFT349


1494 572±1

570±1

572±1

571±1

HFT351


1495 567±2

575±1

543±1

560±1

HFT356

schist/mus-covite

1509 567±1

566±1

567±1

566±1

HFT358

gran-itoid/bio-tite

1510 568±1

568±1

555±1

568±1

Group 3-Southof Ja-cutin-gashearzone(hy-bridages)

HFT353B


1506 537±1

535±1

540±1

537±1

HFT363B

peg-mat-ite/bi-otite

1515 538±1

537±1

525±1

537±1

HFT363B

peg-mat-ite/mus-covite

1516 562±1

561±1

562±1

562±1

CAR1

schist/mus-covite

927 525±1

536±3

521±2

526±3

H687B

peg-mat-ite/bi-otite

1501 557±2

527±1

541±1

533±1

H687B

peg-mat-ite/mus-covite

1502 528±1

539±1

535±1

533±2


1503 534±1

546±1

544±1

541±1

LUME

schist/mus-covite

922 531±2

526±1

511±2

527±4

MN85

schist/mus-covite

929 553±2

545±2

523±1

537±2

H681 para-gneiss/bio-tite

1499 521±1

522±1

518±1

521±1

Group 4-Southof Ja-cutin-gashearzone


1488 492±1

490±1

492±1

491±1


1492 516±1

514±1

524±1

518±1

MR72

schist/mus-covite

928 badrun

512±1

509±2

510±2

ANDT

schist/mus-covite

921 499±1

504±1

501±1

501±2

DIT schist/bio-tite

919 497±1

497±1

493±1

494±3

DIT schist/mus-covite

918 499±2

494±2

500±1

498±2

FDA schist/bio-tite

932 501±1

501±1

501±1

501±1

FDA schist/mus-covite

931 502±2

496±1

495±1

496±1

ITMTR

schist/mus-covite

924 500±1

506±1

507±2

503±2


Paper 2



Belt Tectonics

Discussion and ConclusionsThe U-Pb and 40Ar/39Ar ages presented above can be

divided into different groups which define the tectonic his-tory of different blocks related to the collision and amal-gamation of the Neoproterozoic around the southern limitof the São Francisco Craton. These final stages occur atdifferent times and overprint differently the Brasília andRibeira belts ( Figure 7 ). The older U-Pb monazite agesbetween 642±1 and 620±1 Ma (H359) from migmatitesand high-grade paragneisses of the Guaxupé Domain in thesouthern Brasília belt, are considered to date the main met-amorphic phase associated with granitic plutonism, colli-sion and a tangential tectonic regime ( Figure 7 ). This issupported by U-Pb data and geologic constraints from theSocorro Domain indicating pre- to syn-collisional process-es between 650 and 628 Ma (Hackspacher et al., 2003;Piuzana et al., 2002; Pimentel et al., 2004).

The U-Pb monazite ages from the Guaxupé and SocorroDomains between 613±1 and 607±3 Ma represent latestage metamorphism of the Brasília belt associated witheastward thrusting and nappe stacking. Pegmatites intrud-ing upper crustal level have concordant monazite ages ofaround 598 Ma (Fig. 5I). They were associated with thefinal magmatic evolution, popossibly the same event re-ported by Janasi et al. (2001) in the Guaxupé Domain,between ca. 610 and 580 Ma. This late magmatism is in-terpreted to represent the post-orogenic uplift of the Bra-sília belt (Wernick, 1998) and marks the final closure ofthe Goianides Ocean (Fischel et al., 1998; Pimentel et al.,2000; Piuzana et al., 2002). Magmatic ages between 595and 560 Ma record the main period of tectonic activity inthe Ribeira belt (Machado et al., 1996) suggesting thatmagmatism in the easternmost part of the Brasília beltcould be a response to tectonic and possibly magmatic ac-tivity in the Central Ribeira belt. Biotite 40Ar/39Ar coolingages of 599±1 and 587±1 Ma from the paragneisses of theGuaxupé Domain indicate that the nappe system cooledfrom the 700 oC closure temperature of monazite to 350oC over 10-20 myr, possibly as a result of exhumation ofthe southern Brasília belt.

Figure 7. Biotite and muscovite age-histogram

U-Pb monazite and 40Ar/39Ar biotite and muscovite age-histogram of the Southern Brasília and Central Ribeirabelts. See text for details.

The 40Ar/39Ar ages in the range between 580 – 520 Ma,defining groups 2 and 3, include rocks south of the Jacu-tinga shear zone (Socorro Domain) and reflect a complexhistory of exhumation of the Nappe System. Transpres-sional structures in the Brasília belt characterize deforma-tion during this time and are interpreted to be related to thetectonic evolution of the Central Ribeira belt ( Figure 7 )as described in the regional geology. At that time the maintectonic activity in the Ribeira belt changed from a com-pressive to an extensional regime where ductile shear zonesevolved to brittle systems.

In the Socorro Domain, the 40Ar/39Ar ages from 571±1and 560±1 Ma down to 537±1 and 521±1 Ma, are signifi-cantly younger than those north of the shear zone. Thisdelayed cooling reflects either different times of exhuma-tion, or partial resetting due to reheating during transpres-sional tectonics related to the Ribeira belt. Supported by acomponent of vertical displacement along the strike-slipshear zones, and contrasting metamorphic conditions oneither side of Jacutinga shear zone (greenschist and am-phibolite facies), we favour a later exhumation for thisdomain, but further interpret the variability of apparentages of single samples as representing overprinting by tec-tonic activity related to the Ribeira belt. The apparentcooling ages around 520 Ma from samples located alongthe NE-SW trending sub-vertical strike-slip Jacutinga andTrês Corações shear zones between the Guaxupé and So-corro Domains (Fig. 3) define both the latest time and thewesternmost limit of the effects of the Ribeira belt tectonicon the Brasília belt. The youngest group of 40Ar/39Ar ages,between 505 and 490 Ma, is limited to the Metasedimen-tary Succession Domain (see Fig. 3A-B), south of theJacutinga shear zone, are identical to typical cooling ages


Paper 2



Belt Tectonics

in the Ribeira belt along the Atlantic coast further to theeast. Thus, we interpret these ages to reflect final uplift.

The 40Ar/39Ar cooling ages of samples ANDT, DIT,FDA, ITM TR and TI45 (Group 4, Table 4 ) are the young-est and suggest a trend ageing to the NW within theMetasedimentary Succession Domain. Although more datais required to establish this trend, the data suggest progres-sive partial reheating related to exhumation of the CentralRibeira belt.

In summary, integration of U-Pb and 40Ar/39Ar ages,supported by geologic documentation, indicates that thesouthern Brasília belt was reactivated by the younger Cen-tral Ribeira belt. Such interaction took place from the endof the Neoproterozoic to early Phanerozoic, during the as-sembly of West Gondwana. The southern margins of theBrasília belt reached the main collision phase with the SãoFrancisco Craton at 620 Ma ( Table 1 ) and peak metamor-phism at 610-590 Ma as indicated by monazite ages. Thiswas followed by exhumation and cooling before a lateoverprinting as a result of collision with the Central Ribeira

belt and subsequent transpression. This late event causedthe resetting of cooling ages to between 580 and 520 Ma.Late cooling ages recorded by samples from the Jacutingashear zone marks the northwestern limit of a progressiveregional cooling, associated to the Ribeira belt transpres-sional tectonics.

AcknowledgementsThe authors are grateful for support provided by FA-

PESP (grant numbers 96/4403-5, 97/06544-8, 97/1397-7,93/4550-0, 01/04420 –7, 99/00358-3 and 00/03960-5) andCNPq (grant numbers 52.2388/95-7, 400490/94-3,522386/95-4) to make this research possible, and to ArturTakashi Onoe of the Institute of Geosciences at USP foranalyzing the 40Ar/39Ar samples for this study and to Dan-iel Godoy and Marli C. Ribeiro of the Institute of Geo-sciences at UNESP for drafting the figures. We thankRobert Ancskiewicz, Bruce Schaefer and Roberto Wein-berg for detailed and careful review.


Paper 2



Belt Tectonics

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Paper 2



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A. 40Ar/39Ar analytical data

Table A.1. 40Ar/39Ar analytical data (single grains;

triplicate) from the southern Brasília belt

Sa

m

ple

M

ate

ria

l

La

b#

La

ser

40/

39

38/

39

37/

39

36/

39

40

*/

39

Ar

40

%

Ra

d

Ag

e

±

(

W)

(

mo

ls)

(

M

a)

(

M

a)

SPA0104-46

DIT

muscovite

0918-01A

0.20

34.99554

0.03762

0.00000

0.05417

18.98691

3.73E-16

54.3

528.38

99.59

0918-01B

0.35

22.02483

0.06764

0.13530

0.06565

2.63582

3.57E-16

12.0

83.27

78.50

0918-01C

0.50

21.07184

0.01166

0.00000

0.00250

20.33110

6.75E-16

96.5

560.52

27.11

0918-01D

0.70

19.36441

0.01606

0.00000

0.00677

17.36386

2.28E-15

89.7

488.79

9.80

0918-01E

0.90

20.62366

0.01391

0.00000

0.00878

18.02889

7.72E-15

87.4

505.12

3.90

0918-01F

1.20

18.13211

0.00925

0.00000

0.00123

17.76869

5.43E-14

98.0

498.75

3.28

0918-01G

1.50

17.88917

0.01015

0.00000

0.00037

17.77886

1.75E-13

99.4

499.00

1.48

0918-01H

1.80

17.58880

0.01107

0.00000

0.00004

17.57570

8.51E-14

99.9

494.01

2.70

0918-01I

2.21

17.35954

0.01000

0.00348

0.00063

17.17410

1.21E-14

98.9

484.11

3.42

0918-01J

2.60

17.49722

0.01005

0.00484

-0.00104

17.80396

7.16E-15

101.8

499.61

3.80

0918-01K

3.00

17.89628

0.00953

0.00000

0.00015

17.85264

4.63E-15

99.8

500.81

5.30

0918-01L

3.50

17.71013

0.01107

0.00000

0.00079

17.47606

1.04E-14

98.7

491.56

3.45

0918-01M

4.01

17.56516

0.00843

0.00000

-0.00168

18.06222

6.55E-15

102.8

505.93

6.42

0918-01N

5.00

17.71979

0.01036

0.00098

0.00032

17.62365

2.97E-14

99.5

495.19

6.91

0918-02A

0.40

31.01904

0.04078

0.00000

0.04669

17.22230

4.07E-16

55.5

485.30

76.90

0918-02B

0.70

19.74241

0.01766

0.02285

0.01476

15.38225

9.67E-16

77.9

439.26

21.47

0918-02C

1.00

23.14369

0.01551

0.00000

0.02461

15.86980

6.84E-15

68.6

451.57

10.42

0918-02D

1.30

18.11691

0.01038

0.00000

0.00073

17.89974

8.25E-14

98.8

501.96

5.66

0918-02E

1.30

17.69018

0.01142

0.00000

0.00019

17.63213

8.68E-14

99.7

495.40

1.77

0918-02F

1.50

17.74161

0.01111

0.00000

0.00104

17.43366

4.23E-14

98.3

490.52

1.32

0918-02G

1.80

17.66632

0.01087

0.00051

0.00016

17.61735

1.17E-13

99.7

495.03

1.15

0918-02H

2.40

17.45740

0.01170

0.00017

0.00086

17.20333

7.49E-15

98.5

484.83

3.11

0918-02I

3.50

17.52780

0.01052

0.00418

-0.00067

17.72552

9.39E-15

101.1

497.69

3.41

0918-02J

4.21

17.68867

0.00926

0.00000

-0.00051

17.83776

1.19E-14

100.8

500.44

2.47

0918-02K

5.00

17.90383

0.01049

0.00000

0.00001

17.89964

4.18E-14

100.0

501.96

1.22

0918-03A

0.40

28.69800

0.02584

0.00000

-0.01692

33.69763

2.36E-16

117.4

852.35

85.68

0918-03B

0.70

19.08914

0.01142

0.00000

-0.00240

19.79727

4.70E-16

103.7

547.82

34.96

0918-03C

1.00

18.75248

0.00816

0.00000

-0.00145

19.17980

1.90E-15

102.3

533.03

10.75

0918-03D

1.30

18.39155

0.00975

0.00000

0.00161

17.91525

2.74E-14

97.4

502.34

5.00

0918-03E

1.50

17.82795

0.01049

0.00090

0.00009

17.80051

1.93E-13

99.8

499.53

1.02

0918-03F

1.80

17.44432

0.01043

0.06087

0.00061

17.26994

1.42E-14

99.0

486.48

2.76

0918-03G

2.39

17.71740

0.01139

0.02568

-0.00058

17.88946

7.38E-15

101.0

501.71

2.75

0918-03H

3.00

17.96870

0.00454

0.04115

-0.00280

18.80010

1.58E-15

104.6

523.87

11.37

0918-03I

4.01

17.98773

0.01066

0.00000

-0.00006

18.00455

1.06E-14

100.1

504.52

2.40

0918-03J

5.00

17.83576

0.01035

0.00000

-0.00024

17.90450

2.54E-14

100.4

502.08

1.12

DIT

bi-otite

0919-01A

0.20

9.06844

0.01152

0.12938

0.01930

3.37537

3.37E-16

37.2

105.96

33.18

0919-01B

0.32

17.50870

0.01024

0.00000

-0.00138

17.91605

3.61E-15

102.3

502.36

5.62

0919-01C

0.50

17.40207

0.01262

0.00312

0.00082

17.15837

2.28E-14

98.6

483.72

1.77

0919-01D

0.70

17.47020

0.01079

0.00149

0.00031

17.37714

3.55E-14

99.5

489.12

2.83

0919-01E

0.90

17.43010

0.01052

0.00056

0.00009

17.40245

3.20E-14

99.8

489.75

2.04

0919-01F

1.10

17.50693

0.00984

0.00043

-0.00007

17.52696

3.56E-14

100.1

492.81

3.34

0919-01G

1.40

17.60194

0.01090

0.00050

-0.00018

17.65514

6.43E-14

100.3

495.96

0.95

0919-01H

1.70

17.70686

0.01084

0.00000

-0.00036

17.81386

4.00E-14

100.6

499.86

1.05

0919-01I

2.01

17.62447

0.01076

0.00000

-0.00034

17.72461

2.57E-14

100.6

497.67

1.14

0919-01J

2.31

17.36753

0.00927

0.00000

-0.00058

17.53675

1.80E-14

101.0

493.05

2.66

0919-01K

2.80

17.52129

0.01027

0.00000

-0.00021

17.58152

1.78E-14

100.3

494.15

2.32

0919-01L

3.50

17.67417

0.01252

0.00000

0.00022

17.60986

3.92E-15

99.6

494.85

5.37

0919-01M

4.21

17.13693

0.00844

0.01569

-0.00898

19.79088

8.50E-16

115.5

547.67

19.60

0919-01N

5.00

17.55173

0.01049

0.00000

-0.00016

17.59920

9.55E-15

100.3

494.59

3.02

0919-02A

0.30

17.44960

0.01226

0.00372

0.00748

15.23778

3.58E-15

87.3

435.59

5.19

0919-02B

0.50

17.62771

0.01016

0.00000

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17.29436

2.22E-14

98.1

487.08

2.26

0919-02C

0.70

17.73416

0.01186

0.00014

0.00060

17.55576

2.52E-14

99.0

493.52

1.78

0919-02D

1.00

17.76376

0.01074

0.00000

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17.75348

4.47E-14

99.9

498.38

1.64

0919-02E

1.30

17.72868

0.01086

0.00089

0.00013

17.68824

6.69E-14

99.8

496.78

0.87

0919-02F

1.60

17.64869

0.00989

0.00000

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17.69516

4.00E-14

100.3

496.95

1.57

0919-02G

2.01

17.72873

0.01063

0.00000

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17.74815

2.04E-14

100.1

498.25

1.97

0919-02H

2.50

17.78852

0.01322

0.00000

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18.60000

2.03E-15

104.6

519.02

11.14

0919-02I

3.01

17.44783

0.00217

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17.20277

9.47E-16

98.6

484.82

17.78

0919-02J

3.50

17.62887

0.01227

0.00000

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19.49104

7.12E-16

110.6

540.50

22.45

0919-02K

4.21

17.40586

0.03533

0.09733

0.02712

9.39986

6.64E-16

54.0

280.88

24.52

0919-02L

5.00

18.06929

0.01256

0.00000

0.00193

17.49836

8.05E-15

96.8

492.11

3.65

DIT

bi-otite

0919-03A

0.30

16.12108

0.00672

0.00000

0.00105

15.81036

1.55E-15

98.1

450.07

10.98

0919-03B

0.50

17.26611

0.01104

0.00130

0.00094

16.98855

2.27E-14

98.4

479.52

1.90

0919-03C

0.90

17.46213

0.01091

0.00000

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17.38562

7.57E-14

99.6

489.33

1.01

0919-03D

1.20

17.34918

0.01123

0.00000

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17.35388

7.02E-14

100.0

488.55

1.83

0919-03E

1.40

17.52362

0.01133

0.00036

0.00002

17.51663

5.76E-14

100.0

492.56

0.97

0919-03F

1.80

17.60367

0.01065

0.00000

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17.59285

6.81E-14

99.9

494.43

3.35

0919-03G

2.50

17.59910

0.01147

0.00135

0.00012

17.56400

5.73E-14

99.8

493.72

0.90

0919-03H

3.00

17.30607

0.01103

0.01716

0.00117

16.95984

5.88E-15

98.0

478.80

4.15

0919-03I

4.21

17.47794

0.01387

0.01519

0.00102

17.17807

3.90E-15

98.3

484.21

5.32

0919-03J

5.00

17.56509

0.01122

0.03365

0.00011

17.53589

1.79E-14

99.8

493.03

1.92

ANDT

muscovite

0921-01A

0.20

19.37179

0.01136

0.00000

0.00214

18.73976

4.22E-16

96.7

522.41

45.05

0921-01B

0.35

18.71908

0.00023

0.02898

0.00197

18.13824

1.13E-15

96.9

507.79

17.60

0921-01C

0.50

22.17860

0.01388

0.00308

0.01765

16.96134

3.00E-15

76.5

478.84

9.36

0921-01D

0.70

18.19530

0.01033

0.00000

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17.56919

2.40E-14

96.6

493.85

3.90

0921-01E

0.90

17.85187

0.01136

0.00000

0.00023

17.78387

9.11E-14

99.6

499.12

1.62

0921-01F

1.20

17.85643

0.01062

0.00189

0.00009

17.82789

1.54E-13

99.8

500.20

0.97

0921-01G

1.50

17.72120

0.01042

0.00000

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17.69453

7.92E-14

99.9

496.93

1.38

0921-01H

1.80

17.80844

0.01035

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17.84768

2.80E-14

100.2

500.69

1.29

0921-01I

2.21

17.97489

0.01014

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18.05573

1.62E-14

100.5

505.78

2.22

0921-01J

2.60

17.74771

0.00950

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17.80273

1.24E-14

100.3

499.58

2.51

0921-01K

3.01

17.81626

0.01277

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17.60502

1.37E-14

98.8

494.73

3.35

0921-01L

3.61

17.84461

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17.83745

2.55E-14

100.0

500.44

2.02

0921-01M

4.21

17.49554

0.01029

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17.26321

1.34E-14

98.7

486.31

3.83

0921-01N

5.00

17.89140

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17.80923

2.39E-14

99.5

499.74

1.34

0921-02A

0.40

17.70765

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0.02594

10.05317

4.19E-16

56.8

298.87

44.91

0921-02B

0.70

19.21502

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0.01860

0.00752

16.99246

2.30E-15

88.4

479.61

8.98

0921-02C

0.90

18.35333

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0.00337

0.00182

17.81480

1.37E-14

97.1

499.88

2.38

0921-02D

1.11

18.01447

0.01096

0.00024

0.00007

17.99353

6.01E-14

99.9

504.26

1.47

0921-02E

1.30

18.06155

0.01101

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0.00017

18.01197

9.46E-14

99.7

504.71

1.41

0921-02F

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18.07328

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17.94419

3.57E-14

99.3

503.05

1.93

0921-02G

1.90

18.53662

0.01059

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18.81493

1.13E-14

101.5

524.23

15.30

0921-02H

2.60

17.63450

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17.27376

9.01E-15

98.0

486.57

2.56

0921-02I

3.61

18.18203

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18.10981

2.38E-14

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507.10

2.73

0921-02J

5.01

17.98396

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17.86924

3.33E-14

99.4

501.21

1.08

0921-03A

0.40

19.77370

0.02079

0.01007

0.01653

14.89021

1.89E-15

75.3

426.74

11.97

0921-03B

0.70

17.93937

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17.87054

6.74E-14

99.6

501.25

1.00

0921-03C

0.90

18.07464

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17.86156

4.68E-14

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501.03

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0921-03D

1.10

18.81762

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18.58007

1.08E-14

98.7

518.54

2.20

0921-03E

1.30

18.23988

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17.65114

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495.86

2.86

0921-03F

1.50

17.87495

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17.80673

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499.68

1.64

0921-03G

1.90

17.84428

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17.82189

7.03E-14

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500.05

1.76

0921-03H

2.40

17.84359

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17.81164

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499.80

1.70

0921-03I

3.01

17.95987

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17.92682

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99.8

502.62

1.70

0921-03J

3.61

17.75549

0.01115

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16.97666

5.96E-15

95.6

479.22

4.25

0921-03K

4.22

17.90060

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0.00000

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18.35697

3.90E-15

102.6

513.12

5.07

0921-03L

5.00

18.04344

0.01120

0.00000

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17.84830

1.95E-14

98.9

500.70

1.51

LUME

muscovite

0922-01A

0.20

22.62650

0.00881

0.00000

0.02817

14.30016

6.02E-16

63.2

411.62

35.39

0922-01B

0.35

19.07252

0.01304

0.03012

0.00833

16.61356

2.42E-15

87.1

470.20

8.32

0922-01C

0.50

18.62385

0.01042

0.00000

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18.80107

8.13E-15

101.0

523.89

2.70

0922-01D

0.70

19.38744

0.01077

0.00054

0.00050

19.23809

4.68E-14

99.2

534.43

2.08

0922-01E

0.90

19.05813

0.01154

0.00014

0.00018

19.00461

1.33E-13

99.7

528.81

1.50

0922-01F

1.20

19.16220

0.01017

0.00000

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19.09064

1.53E-13

99.6

530.88

3.12

0922-01G

1.50

18.45298

0.01036

0.00000

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18.40042

7.37E-14

99.7

514.18

1.84

0922-01H

1.80

18.62752

0.01078

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18.52163

3.22E-14

99.4

517.12

1.24

0922-01I

2.21

19.10159

0.01100

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19.08943

2.85E-14

99.9

530.85

1.14

0922-01J

2.60

18.67329

0.00943

0.00000

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18.81073

9.17E-15

100.7

524.12

4.60

0922-01K

3.01

19.07078

0.01258

0.01388

0.00134

18.67509

7.31E-15

97.9

520.84

4.16

0922-01L

3.50

19.13904

0.01055

0.00000

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18.74410

5.77E-15

97.9

522.51

4.12

0922-01M

4.21

19.15313

0.01088

0.00010

0.00313

18.22852

4.86E-15

95.2

509.99

4.83

0922-01N

5.00

19.43567

0.01026

0.00000

0.00015

19.39136

8.36E-14

99.8

538.11

3.16

LUME

muscovite

0922-02A

0.35

20.80401

0.00760

0.00000

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21.26196

3.13E-15

102.2

582.44

7.30

0922-02B

0.50

18.68900

0.01073

0.00000

0.00110

18.36407

7.93E-15

98.3

513.29

3.95

0922-02C

0.70

19.69015

0.01098

0.00000

0.00033

19.59296

8.09E-14

99.5

542.94

1.07

0922-02D

0.90

19.26433

0.01120

0.00085

0.00015

19.21980

1.23E-13

99.8

533.99

1.30

0922-02E

1.11

18.94264

0.01101

0.00000

0.00004

18.93089

8.57E-14

99.9

527.03

1.11

0922-02F

1.60

18.86180

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18.83306

1.02E-13

99.9

524.66

1.35

0922-02G

2.50

18.96249

0.01081

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18.93108

1.74E-14

99.8

527.03

2.30

0922-02H

3.41

19.00797

0.00944

0.00000

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19.20436

1.00E-14

101.0

533.62

2.89

0922-02I

4.21

19.24305

0.00964

0.00000

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19.65936

6.89E-15

102.2

544.53

3.46

0922-02J

5.00

19.51547

0.01069

0.00000

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19.53259

7.24E-14

100.1

541.50

1.13

0922-03A

0.35

19.95250

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0.00000

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19.14568

2.42E-15

96.0

532.21

9.43

0922-03B

0.50

18.20611

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17.86548

4.77E-15

98.1

501.12

4.78

0922-03C

0.70

19.20956

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19.10989

5.52E-14

99.5

531.34

3.22

0922-03D

0.90

18.70610

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0.00000

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18.66762

9.17E-14

99.8

520.66

1.20

0922-03E

1.20

18.45496

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0.00010

18.42595

1.08E-13

99.8

514.80

1.70

0922-03F

1.50

18.26814

0.01081

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0.00023

18.19810

3.68E-14

99.6

509.25

1.14

0922-03G

2.01

18.35685

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18.23903

1.17E-14

99.4

510.25

2.76

0922-03H

2.90

18.20906

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0.00000

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17.61100

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96.7

494.88

4.83

0922-03I

4.01

18.90572

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0.00000

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18.17606

4.74E-15

96.1

508.71

4.91

0922-03J

5.00

19.01014

0.01101

0.00000

0.00004

18.99851

5.41E-14

99.9

528.66

1.16

ITMTR

muscovite

0924-01A

0.20

15.21740

0.00909

0.00015

0.00234

14.52607

1.05E-15

95.5

417.42

13.44

0924-01B

0.32

17.35644

0.00957

0.00000

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17.58519

3.50E-15

101.3

494.24

5.31

0924-01C

0.50

18.30061

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0.00000

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18.24538

1.32E-14

99.7

510.40

1.77

0924-01D

0.70

18.07563

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18.04107

3.59E-14

99.8

505.42

1.05

0924-01E

0.90

17.80647

0.00993

0.00000

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17.81816

6.93E-14

100.1

499.96

1.12

0924-01F

1.10

17.68447

0.01105

0.00000

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17.79320

3.73E-14

100.6

499.35

0.92

0924-01G

1.30

17.66318

0.01013

0.00000

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18.08351

1.35E-14

102.4

506.45

3.14

0924-01H

1.60

17.64254

0.00949

0.00000

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17.77231

9.64E-15

100.7

498.84

2.34

0924-01I

1.90

17.73239

0.01147

0.01032

0.00228

17.05825

8.82E-15

96.2

481.24

2.66

0924-01J

2.40

17.69701

0.01021

0.00153

0.00021

17.63416

1.39E-14

99.6

495.45

2.95

0924-01K

3.00

17.83663

0.01099

0.00000

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17.70588

1.58E-14

99.3

497.21

2.54

0924-01L

3.61

17.66063

0.01105

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17.61427

1.14E-14

99.7

494.96

3.33

0924-01M

4.21

18.04271

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17.78268

6.59E-15

98.6

499.09

3.64

0924-01N

5.01

18.50874

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18.17456

9.70E-15

98.2

508.68

4.24

0924-02A

0.20

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8.79155

5.18E-16

87.8

263.97

23.62

0924-02B

0.35

16.52072

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15.73293

2.50E-15

95.2

448.12

7.06

0924-02C

0.60

17.84425

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17.72978

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99.4

497.80

2.31

0924-02D

0.80

18.03443

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18.07001

2.03E-14

100.2

506.12

1.43

0924-02E

1.00

18.23731

0.00926

0.00000

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18.36787

3.58E-14

100.7

513.38

1.62

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1.20

18.07355

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18.06817

6.85E-14

100.0

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17.86998

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501.23

1.90

0924-02H

1.90

17.90514

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503.86

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101.0

507.69

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3.50

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100.2

497.73

1.10

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504.41

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0924-02L

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121.8

521.62

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495.11

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18.51858

2.04E-14

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517.05

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0924-03D

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18.15191

5.55E-14

99.7

508.12

1.20

0924-03E

1.00

17.97449

0.00952

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18.04434

3.58E-14

100.4

505.50

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0924-03F

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2.23E-14

99.2

491.33

1.51

0924-03G

1.80

17.64568

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17.59898

1.76E-14

99.7

494.58

1.98

0924-03H

2.60

17.82511

0.01067

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17.88402

2.10E-14

100.3

501.58

2.27

0924-03I

3.50

17.79914

0.01017

0.00000

-0.00013

17.83636

2.51E-14

100.2

500.41

2.04

0924-03J

5.00

18.12931

0.01135

0.00087

0.00027

18.05032

2.25E-14

99.6

505.64

1.30

CAR1

muscovite

0927-01A

0.20

37.82159

0.00971

0.00000

0.06185

19.54532

8.44E-16

51.7

541.80

46.84

0927-01B

0.32

31.87494

0.02098

0.01456

0.04787

17.72863

1.98E-15

55.6

497.77

20.35

0927-01C

0.50

19.75926

0.01081

0.00000

0.00352

18.71976

1.03E-14

94.7

521.92

3.47

0927-01D

0.70

18.87772

0.01045

0.00000

0.00030

18.78786

6.40E-14

99.5

523.57

1.28

0927-01E

0.90

19.04198

0.01115

0.00000

0.00030

18.95309

1.05E-13

99.5

527.56

1.08

0927-01F

1.20

18.82614

0.01066

0.00000

0.00007

18.80382

1.06E-13

99.9

523.96

0.95

0927-01G

1.50

18.63888

0.01047

0.00000

-0.00014

18.67874

4.91E-14

100.2

520.93

0.99

0927-01H

1.90

18.70713

0.00921

0.00000

-0.00064

18.89532

2.14E-14

101.0

526.17

1.61

0927-01I

2.40

18.47297

0.01066

0.00000

0.00015

18.42670

1.76E-14

99.8

514.81

2.23

0927-01J

3.20

18.88837

0.01249

0.00000

0.00203

18.28670

7.53E-15

96.8

511.41

5.12

0927-01K

4.21

19.00895

0.01172

0.00000

0.00060

18.83201

4.93E-15

99.1

524.64

4.76

0927-01L

5.01

19.33690

0.00936

0.00000

-0.00012

19.37255

2.03E-14

100.2

537.66

4.40

0927-02A

0.20

19.68752

0.02649

0.00000

0.02501

12.29671

2.15E-16

62.5

359.31

89.94

0927-02B

0.35

19.22689

0.02090

0.00000

0.01129

15.89009

6.99E-16

82.6

452.08

25.11

0927-02C

0.55

19.11724

0.00858

0.00000

-0.00023

19.18374

6.69E-15

100.4

533.12

4.61

0927-02D

0.70

19.54736

0.01001

0.00000

-0.00001

19.55016

2.98E-14

100.0

541.92

4.41

0927-02E

0.90

19.21360

0.01138

0.00000

-0.00005

19.22641

1.05E-13

100.1

534.15

2.68

0927-02F

1.30

19.41506

0.01030

0.00000

-0.00001

19.41805

2.23E-13

100.0

538.75

4.36

0927-02G

1.70

18.88501

0.01115

0.00000

0.00000

18.88398

6.40E-14

100.0

525.90

1.30

0927-02H

2.21

18.36925

0.01089

0.00000

0.00007

18.34672

2.19E-14

99.9

512.87

1.28

0927-02I

2.70

18.76426

0.01262

0.00000

0.00114

18.42759

8.28E-15

98.2

514.84

3.16

0927-02J

3.20

19.24012

0.00911

0.00000

-0.00193

19.80998

6.09E-15

103.0

548.13

3.73

0927-02K

4.21

19.44152

0.00992

0.00000

-0.00105

19.75188

1.68E-14

101.6

546.74

1.68

0927-02L

5.00

19.45008

0.00934

0.00000

-0.00059

19.62322

2.33E-14

100.9

543.67

2.44

0927-03A

0.25

19.92119

-0.00210

0.00000

0.00386

18.77929

5.14E-16

94.3

523.36

36.24

0927-03B

0.45

19.59501

0.00126

0.00000

-0.00043

19.72110

2.31E-15

100.6

546.01

8.58

0927-03C

0.70

19.85020

0.00962

0.00000

0.00043

19.72280

1.43E-14

99.4

546.05

2.05

0927-03D

0.90

19.27898

0.00981

0.00000

0.00026

19.20067

7.42E-14

99.6

533.53

4.38

0927-03E

1.20

18.59703

0.01098

0.00000

0.00004

18.58421

1.50E-13

99.9

518.64

5.33

0927-03F

1.60

18.79766

0.01106

0.00000

0.00000

18.79742

7.30E-14

100.0

523.80

1.59

0927-03G

2.11

18.58188

0.01062

0.00000

-0.00007

18.60332

2.91E-14

100.1

519.10

1.32

0927-03H

2.90

18.77201

0.01047

0.00000

0.00084

18.52361

9.07E-15

98.7

517.17

2.92

0927-03I

3.81

19.42098

0.00910

0.00000

0.00063

19.23277

3.99E-15

99.0

534.30

5.57

0927-03J

5.00

19.49111

0.01015

0.00000

0.00017

19.43968

1.68E-14

99.7

539.27

2.20

MR72

muscovite

0928-01A

0.20

81.49034

0.02990

0.11449

0.04344

68.66753

5.58E-15

84.3

1447.41

17.29

0928-01B

0.32

30.68523

0.01606

0.01040

0.02157

24.31080

4.78E-15

79.2

652.45

8.35

0928-01C

0.50

20.88922

0.01098

0.00000

0.00502

19.40439

7.59E-15

92.9

538.42

3.75

0928-01D

0.70

19.14827

0.01055

0.00131

0.00149

18.70793

1.04E-14

97.7

521.64

4.96

0928-01E

0.90

18.88132

0.01142

0.01093

0.00374

17.77659

1.36E-14

94.2

498.94

3.39

0928-01F

1.11

22.28664

0.01065

0.00440

0.00134

21.89010

3.75E-14

98.2

597.09

5.15

0928-01G

1.40

17.93627

0.01008

0.00712

0.00064

17.74656

5.06E-14

98.9

498.21

1.67

0928-01H

1.90

18.50156

0.00910

0.00412

0.00025

18.42659

4.88E-14

99.6

514.81

3.09

0928-01I

2.50

19.19785

0.01090

0.01076

0.00118

18.84965

2.39E-14

98.2

525.07

2.49

0928-01J

3.20

19.73034

0.01071

0.01241

0.00166

19.24112

6.45E-15

97.5

534.50

3.73

0928-01K

4.22

25.97722

0.01137

0.06321

0.00253

25.23545

1.22E-14

97.1

673.15

4.96

0928-01L

5.00

47.25016

0.01113

0.05884

0.00201

46.66314

9.32E-15

98.8

1096.43

7.69

0928-01M

3.00

128.89640

-0.04515

0.00000

-0.02018

134.85790

7.95E-16

104.6

2216.74

99.14

0928-02A

0.20

10.99442

-0.00085

0.00000

0.00836

8.52469

6.32E-16

77.5

256.50

19.75

0928-02B

0.35

16.31712

0.01099

0.03702

0.00544

14.71248

3.41E-15

90.2

422.20

6.11

0928-02C

0.55

18.16058

0.01107

0.00444

0.00145

17.73053

1.35E-14

97.6

497.81

2.53

0928-02D

0.80

18.62442

0.01042

0.00297

0.00105

18.31388

3.83E-14

98.3

512.07

2.35

0928-02E

1.10

18.39925

0.01066

0.00146

0.00012

18.36431

2.37E-13

99.8

513.30

1.01

0928-02F

1.40

18.22649

0.01110

0.00132

0.00000

18.22623

1.73E-13

100.0

509.94

0.95

0928-02G

1.90

18.39205

0.01001

0.00000

-0.00022

18.45686

2.12E-14

100.4

515.55

1.49

0928-02H

2.41

18.61056

0.01001

0.00000

-0.00076

18.83368

1.59E-14

101.2

524.68

3.75

0928-02I

2.90

18.26818

0.01118

0.00000

0.00018

18.21312

1.62E-14

99.7

509.62

3.02

0928-02J

3.50

18.18483

0.01073

0.00000

0.00097

17.89790

8.26E-15

98.4

501.92

3.16

0928-02K

4.31

18.35975

0.01049

0.00105

0.00049

18.21466

9.48E-15

99.2

509.65

2.68

0928-02L

5.01

18.49197

0.00973

0.00000

-0.00023

18.55870

1.70E-14

100.4

518.02

3.21

MR72

muscovite

0928-03A

0.20

14.76931

0.01595

0.05851

0.01778

9.51916

2.71E-15

64.5

284.18

7.95

0928-03B

0.35

19.40326

0.01449

0.03619

0.00659

17.45986

7.75E-15

90.0

491.16

4.10

0928-03C

0.60

19.65725

0.01124

0.01930

0.00366

18.57597

2.35E-14

94.5

518.44

1.52

0928-03D

0.90

18.39405

0.01029

0.00324

0.00035

18.28929

1.85E-13

99.4

511.47

3.72

0928-03E

1.20

18.05239

0.00973

0.00332

-0.00004

18.06520

1.33E-13

100.1

506.01

2.50

0928-03F

1.50

18.28696

0.01191

0.00373

-0.00005

18.30153

6.24E-14

100.1

511.77

2.33

0928-03G

2.01

18.27894

0.01017

0.00661

0.00002

18.27227

3.05E-14

100.0

511.06

1.67

0928-03H

2.80

18.25043

0.01147

0.02673

0.00038

18.13929

1.10E-14

99.4

507.82

2.06

0928-03I

3.50

17.87783

0.01207

0.00185

0.00018

17.82363

6.85E-15

99.7

500.10

4.06

0928-03J

5.01

18.45609

0.01213

0.02035

0.00046

18.32042

3.13E-14

99.3

512.23

1.17

MN85

muscovite

0929-01A

0.20

12.31532

-0.00680

0.00212

-0.01736

17.44373

2.23E-16

141.6

490.76

50.09

0929-01B

0.32

12.16912

0.00633

0.00000

-0.00807

14.55239

3.67E-16

119.6

418.10

31.67

0929-01C

0.50

17.47219

0.01438

0.00000

0.00867

14.91026

1.44E-15

85.3

427.25

11.49

0929-01D

0.70

20.00684

0.01406

0.00204

0.00417

18.77343

3.90E-15

93.8

523.22

5.96

0929-01E

0.90

20.98805

0.01094

0.00000

0.00228

20.31473

1.39E-14

96.8

560.13

4.05

0929-01F

1.20

20.20350

0.01082

0.00084

0.00030

20.11401

1.00E-13

99.6

555.37

1.53

0929-01G

1.60

19.95981

0.01054

0.00033

0.00005

19.94475

2.13E-13

99.9

551.34

1.11

0929-01H

2.01

19.45877

0.01083

0.00326

0.00017

19.40887

3.33E-14

99.7

538.53

1.36

0929-01I

2.50

18.91342

0.01066

0.00072

0.00026

18.83548

2.65E-14

99.6

524.72

3.82

0929-01J

3.00

19.37273

0.01207

0.00000

-0.00046

19.50716

9.59E-15

100.7

540.89

3.80

0929-01K

4.21

19.83555

0.01108

0.00074

0.00129

19.45472

8.25E-15

98.1

539.63

3.70

0929-01L

5.00

19.93276

0.00966

0.00000

-0.00005

19.94757

8.19E-14

100.1

551.41

3.88

0929-02A

0.20

9.40600

0.00849

0.00000

0.00179

8.87696

5.75E-16

94.4

266.35

18.20

0929-02B

0.35

16.50137

0.01024

0.00000

0.00223

15.84295

2.06E-15

96.0

450.90

9.34

0929-02C

0.55

20.17666

0.01271

0.00000

0.00340

19.17116

6.39E-15

95.0

532.82

4.38

0929-02D

0.80

19.96727

0.01056

0.00137

0.00047

19.82741

3.34E-14

99.3

548.54

2.72

0929-02E

1.00

19.70589

0.01115

0.00000

0.00020

19.64524

1.07E-13

99.7

544.19

1.92

0929-02F

1.30

19.63612

0.01101

0.00000

0.00000

19.63451

1.20E-13

100.0

543.94

1.33

0929-02G

1.70

19.43583

0.01087

0.00000

0.00011

19.40261

5.83E-14

99.8

538.38

1.25

0929-02H

2.31

18.95207

0.01100

0.00037

0.00008

18.92776

5.07E-14

99.9

526.95

1.35

0929-02I

3.01

19.28413

0.01021

0.02226

-0.00037

19.39341

1.87E-14

100.6

538.16

3.24

0929-02J

4.41

19.60365

0.01147

0.00000

0.00010

19.57243

9.99E-15

99.8

542.45

3.27

0929-02K

5.00

20.03189

0.01109

0.04408

0.00001

20.03230

7.44E-14

100.0

553.42

2.12

0929-03A

0.25

19.01764

0.01605

0.10404

0.01878

13.47615

3.66E-15

70.9

390.29

7.49

0929-03B

0.40

20.08900

0.01256

0.01126

0.00563

18.42621

6.22E-15

91.7

514.80

4.79

0929-03C

0.60

20.05961

0.01107

0.01086

0.00423

18.81081

2.44E-14

93.8

524.13

2.20

0929-03D

0.90

18.86794

0.00961

0.00298

0.00031

18.77550

1.28E-13

99.5

523.27

1.98

0929-03E

1.20

18.83002

0.01050

0.00285

0.00013

18.79034

7.08E-14

99.8

523.63

1.24

0929-03F

1.60

18.70814

0.01054

0.00000

-0.00031

18.79854

1.94E-14

100.5

523.83

1.52

0929-03G

2.21

18.87299

0.01134

0.00000

0.00045

18.74010

1.36E-14

99.3

522.42

2.14

0929-03H

3.31

18.70799

0.01089

0.00000

0.00036

18.59989

6.09E-15

99.4

519.02

4.91

0929-03I

4.51

19.53382

0.01187

0.00328

0.00053

19.37553

1.99E-14

99.2

537.73

1.53

0929-03J

5.00

19.53593

0.00960

0.00000

-0.00154

19.99101

6.32E-15

102.3

552.44

3.80

FDA

muscovite

0931-01A

0.20

23.65924

0.05739

0.54860

0.08147

-0.37283

1.99E-16

-1.6

-12.10

162.09

0931-01B

0.32

28.77184

0.07122

0.00000

0.05886

11.37724

2.60E-16

39.5

334.78

122.11

0931-01C

0.50

18.83294

0.03224

0.02726

0.02458

11.56998

4.33E-16

61.4

339.95

44.56

0931-01D

0.70

20.67170

0.01998

0.03366

0.01786

15.39570

1.60E-15

74.5

439.60

14.31

0931-01E

0.90

18.89058

0.01420

0.00000

0.00603

17.10916

4.75E-15

90.6

482.50

4.46

0931-01F

1.11

18.19770

0.01117

0.00000

0.00228

17.52368

1.37E-14

96.3

492.73

2.28

0931-01G

1.40

17.71200

0.01101

0.00000

0.00012

17.67558

5.46E-14

99.8

496.47

1.57

0931-01H

1.80

17.66513

0.01089

0.00000

0.00006

17.64694

1.60E-13

99.9

495.76

3.65

0931-01I

2.40

17.89642

0.01075

0.00000

-0.00021

17.95733

3.24E-14

100.3

503.37

1.15

0931-01J

3.01

17.59064

0.01015

0.00000

-0.00030

17.67750

1.36E-14

100.5

496.51

2.57

0931-01K

4.31

17.51273

0.01098

0.00000

0.00036

17.40461

1.20E-14

99.4

489.80

4.00

0931-01L

5.00

17.63974

0.01034

0.00000

0.00019

17.58264

1.68E-14

99.7

494.18

2.46

FDA

muscovite

0931-02A

0.25

31.94170

0.08672

0.43721

0.11102

-0.83227

2.50E-16

-2.6

-27.11

173.40

0931-02B

0.40

19.11625

-0.01046

0.15393

-0.00568

20.80779

2.54E-16

108.8

571.78

62.47

0931-02C

0.65

34.26534

0.02865

1.55309

0.06399

15.49553

1.82E-15

45.2

442.13

24.12

0931-02D

0.90

20.61940

0.01255

0.10279

0.01122

17.31156

4.59E-15

84.0

487.50

6.71

0931-02E

1.20

19.00588

0.01176

0.00000

0.00455

17.65995

1.76E-14

92.9

496.08

2.21

0931-02F

1.60

17.76406

0.01118

0.00033

0.00042

17.64010

1.24E-13

99.3

495.59

1.54

0931-02G

2.21

17.64548

0.01048

0.00015

0.00014

17.60236

3.39E-13

99.8

494.67

1.17

0931-02H

3.01

17.44478

0.01079

0.00249

0.00054

17.28509

2.78E-14

99.1

486.85

1.93

0931-02I

4.22

17.68380

0.01009

0.00000

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526.68

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1501-02C

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527.73

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1501-02D

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99.5

530.86

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1501-02E

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43.73469

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525.14

1.48

1501-02F

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43.48668

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525.66

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1501-02G

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527.08

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1501-03A

0.40

49.71546

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40.68083

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496.29

3.50

1501-03B

0.70

45.54454

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538.18

1.50

1501-03C

1.10

44.96016

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44.78094

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539.49

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1501-03D

1.60

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542.61

1.25

1501-03E

2.40

44.75018

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540.10

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1501-03F

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44.80575

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543.45

1.64

1501-03G

5.19

45.16229

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44.96653

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99.5

541.43

2.48

H687B

muscovite

1502-01A

0.50

32.71007

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22.51637

0.14205

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3.25E-16

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56.49

1502-01B

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43.06990

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39.42696

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482.86

7.93

1502-01C

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44.34916

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529.60

1.07

1502-01D

1.90

43.71209

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43.66151

3.68E-13

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527.80

1.08

1502-01E

2.31

43.61043

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43.63622

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100.1

527.53

1.29

1502-01F

2.70

43.34575

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43.47060

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525.80

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1502-01G

3.71

43.87056

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43.95580

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100.2

530.88

1.60

1502-01H

5.19

44.34393

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44.39589

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535.48

1.16

1502-02A

0.80

44.01542

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27.83550

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62.6

353.81

19.14

1502-02B

1.20

53.01745

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2.28692

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44.06779

4.01E-15

83.0

532.05

6.03

1502-02C

1.60

45.11845

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44.85006

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540.21

0.99

1502-02D

1.80

44.51852

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44.50293

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536.60

1.50

1502-02E

2.21

44.61020

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44.55627

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537.15

2.22

1502-02F

3.71

44.20672

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44.07863

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99.6

532.17

1.77

1502-02G

5.20

44.21500

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44.30513

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534.53

1.21

1502-03A

0.80

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111.4

557.87

13.47

1502-03B

1.20

45.21876

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44.32400

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534.73

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1502-03C

1.60

44.39129

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533.94

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1502-03D

1.80

44.26934

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534.56

1.26

1502-03E

2.21

44.17466

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44.30316

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534.51

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1502-03F

3.71

44.04881

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44.25080

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100.5

533.97

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1502-03G

5.19

44.33687

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537.24

1.84

H690

bi-otite

1503-01A

0.40

42.70671

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43.56001

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102.0

526.74

6.03

1503-01B

0.70

43.59361

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101.0

531.46

1.27

1503-01C

1.11

44.02705

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44.11468

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532.54

1.24

1503-01D

1.50

44.17124

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44.27734

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100.2

534.24

1.23

1503-01E

1.90

44.43256

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44.50468

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100.2

536.62

1.05

1503-01F

2.31

44.26485

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44.33780

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534.87

1.01

1503-01G

2.80

43.95959

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44.07736

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532.15

1.71

1503-01H

3.71

44.37996

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44.19326

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533.36

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1503-01I

5.20

44.50377

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535.20

1.78

1503-02A

0.50

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537.38

2.83

1503-02B

0.80

45.19052

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543.42

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1503-02C

1.20

45.55349

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547.55

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1503-02D

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45.58481

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547.84

1.65

1503-02E

1.90

45.61210

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45.39796

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99.5

545.91

2.75

1503-02F

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45.58174

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45.49286

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99.8

546.89

1.35

1503-02G

3.50

45.51620

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545.43

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1503-02H

5.20

45.91010

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547.94

2.05

1503-03A

0.50

43.63484

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41.55552

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505.59

5.84

1503-03B

0.80

44.96603

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44.05383

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531.91

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1503-03C

1.20

45.19154

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544.05

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1503-03D

1.50

44.96495

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542.08

1.26

1503-03E

1.90

45.41829

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45.56853

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100.3

547.68

1.68

1503-03F

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45.11734

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45.31219

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545.02

1.62

1503-03G

3.50

45.13086

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45.28649

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544.75

1.45

1503-03H

5.19

44.93170

0.01147

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44.76689

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99.6

539.35

1.61

SPA0104-46

HFT353B

bi-otite

1506-01A

0.40

39.21003

0.01282

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39.57541

3.03E-15

100.9

463.41

5.41

1506-01B

0.70

46.98209

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46.81061

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99.6

536.62

1.07

1506-01C

1.10

46.90099

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537.26

1.06

1506-01D

1.60

47.14795

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46.93433

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99.5

537.84

1.59

1506-01E

2.21

46.54792

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6.20E-14

99.8

533.20

1.59

1506-01F

2.80

46.84637

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46.80405

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99.9

536.55

1.06

1506-01G

3.71

46.77353

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46.78700

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100.0

536.38

1.37

1506-01H

5.20

46.44695

0.01887

0.22456

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45.76108

8.49E-15

98.5

526.18

3.62

1506-02A

0.50

45.12548

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0.00739

43.03385

9.50E-15

95.3

498.77

2.93

1506-02B

0.80

46.96305

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0.12483

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46.49582

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99.0

533.49

1.70

1506-02C

1.20

46.81939

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46.90743

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100.2

537.58

1.53

1506-02D

1.80

46.51523

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46.37064

3.56E-14

99.7

532.25

1.31

1506-02E

2.50

46.67097

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46.73799

3.75E-14

100.1

535.90

1.53

1506-02F

3.41

46.54531

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46.64124

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100.2

534.94

1.12

1506-02G

5.20

46.67373

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46.78171

4.19E-14

100.2

536.33

1.05

1506-03A

0.50

45.65427

0.01860

0.91606

0.01616

40.97615

7.85E-15

89.7

477.82

2.95

1506-03B

0.80

47.25201

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46.95558

3.42E-14

99.4

538.05

1.31

1506-03C

1.20

47.35618

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47.33385

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541.80

1.10

1506-03D

1.70

46.99253

0.01542

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47.03349

3.71E-14

100.1

538.83

1.19

1506-03E

2.31

47.07903

0.01494

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47.20400

2.96E-14

100.3

540.51

2.03

1506-03F

3.00

46.74651

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46.94955

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100.4

537.99

1.46

1506-03G

5.19

47.07618

0.01526

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47.16471

5.23E-14

100.2

540.13

1.77

HFT355

bi-otite

1507-01A

0.40

47.40622

0.01301

0.00000

0.01261

43.68059

7.86E-15

92.1

505.31

3.80

1507-01B

0.70

52.50301

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0.13886

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51.62112

3.60E-14

98.3

583.70

1.44

1507-01C

1.10

53.16156

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53.09687

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99.9

597.90

1.33

1507-01D

1.50

53.05352

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53.02554

5.02E-14

99.9

597.21

1.33

1507-01E

1.90

53.35112

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0.31180

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52.99944

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99.3

596.96

1.54

1507-01F

2.50

53.02633

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52.94938

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99.9

596.48

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1507-01G

3.71

52.99853

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52.88624

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99.8

595.88

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1507-01H

5.20

52.88415

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52.62540

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99.5

593.37

2.00

HFT355

bi-otite

1507-02A

0.50

29.32819

0.01517

0.00523

0.00702

27.25398

6.47E-15

92.9

331.46

2.27

1507-02B

0.80

50.06055

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50.09039

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568.85

1.48

1507-02C

1.20

52.58038

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52.63664

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593.48

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1507-02D

1.50

53.33438

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53.43917

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601.18

1.38

1507-02E

2.01

53.14080

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53.18063

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100.1

598.70

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1507-02F

2.70

52.94841

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53.04233

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100.2

597.38

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1507-02G

3.50

52.84824

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53.04327

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597.38

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1507-02H

5.20

53.02240

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53.15423

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100.2

598.45

1.21

1507-03A

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38.08110

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37.51183

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441.97

2.21

1507-03B

0.80

51.27345

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51.25660

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100.0

580.17

1.58

1507-03C

1.20

52.79128

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52.94731

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596.46

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1507-03D

1.60

53.13282

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53.28058

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599.66

2.06

1507-03E

2.21

53.07658

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53.11919

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100.1

598.11

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1507-03F

3.01

52.68217

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593.99

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1507-03G

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52.33942

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52.36954

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590.91

1.60

HFT356

muscovite

1509-01A

0.50

47.11239

0.02747

3.00217

0.02534

39.94068

1.78E-15

84.6

467.18

10.46

1509-01B

0.90

49.86709

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49.40664

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99.1

562.18

1.64

1509-01C

1.40

50.17726

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568.79

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1509-01D

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49.80822

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49.77240

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565.75

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1509-01E

2.50

50.11164

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50.09216

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568.87

3.28

1509-01F

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49.83175

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49.87853

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566.79

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1509-01G

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48.98747

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49.09124

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559.09

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1509-01H

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567.45

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494.02

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49.93957

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567.38

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1509-02C

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564.30

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1509-02D

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49.55825

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563.66

1.55

1509-02E

1.90

49.59956

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49.48252

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562.92

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1509-02F

3.81

50.06295

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50.18993

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569.82

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49.89853

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566.98

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1509-03A

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40.55608

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41.21450

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101.6

480.26

3.82

1509-03B

1.00

50.41168

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50.55576

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573.38

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1509-03C

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49.82858

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50.04476

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568.41

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1509-03D

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49.93715

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567.36

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1509-03E

1.90

49.72871

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8.66E-14

100.0

565.25

1.14

1509-03F

3.81

49.84814

0.01127

0.00000

-0.00010

49.87787

3.21E-14

100.1

566.78

1.64

1509-03G

5.20

50.07793

0.01119

0.00000

-0.00018

50.12997

1.35E-14

100.1

569.24

2.67

HFT358

bi-otite

1510-01A

0.40

40.80375

0.01538

2.37810

0.01188

37.53794

3.24E-15

91.9

442.25

5.48

1510-01B

0.70

50.37870

0.01326

0.35988

0.00131

50.03102

1.92E-14

99.3

568.27

1.96

1510-01C

1.10

50.27137

0.01318

0.19472

0.00094

50.01531

4.26E-14

99.5

568.12

1.56

1510-01D

1.50

50.11753

0.01273

0.02023

0.00010

50.09004

4.54E-14

99.9

568.85

1.18

1510-01E

2.01

50.20944

0.01325

0.37191

0.00025

50.17573

4.67E-14

99.9

569.68

1.49

1510-01F

2.60

49.90469

0.01268

0.14100

0.00006

49.90192

5.41E-14

100.0

567.01

1.22

1510-01G

3.71

50.00982

0.01277

0.06099

0.00010

49.98585

9.47E-14

99.9

567.83

1.01

1510-01H

5.19

49.90046

0.01228

0.15377

-0.00006

49.93359

7.67E-14

100.1

567.32

1.11

1510-02A

0.50

44.70603

0.00596

0.00000

0.00049

44.55893

3.73E-15

99.7

514.15

4.72

1510-02B

0.80

49.95340

0.01277

0.00000

0.00128

49.57369

2.29E-14

99.2

563.81

1.59

1510-02C

1.20

50.04196

0.01242

0.00000

-0.00026

50.11942

4.06E-14

100.2

569.13

1.66

1510-02D

1.60

49.81152

0.01302

0.00000

0.00009

49.78342

5.09E-14

99.9

565.86

1.39

1510-02E

2.21

50.11614

0.01253

0.00000

-0.00021

50.17690

4.67E-14

100.1

569.69

1.39

1510-02F

2.90

50.04414

0.01336

0.26169

0.00067

49.87446

3.61E-14

99.6

566.75

1.72

1510-02G

3.71

50.20539

0.01387

0.00000

0.00011

50.17274

3.74E-14

99.9

569.65

1.59

1510-02H

5.20

49.89854

0.01304

0.00824

0.00023

49.83117

1.02E-13

99.9

566.32

1.08

1510-03A

0.50

46.02721

0.01127

0.00000

0.00379

44.90551

5.01E-15

97.6

517.63

4.52

1510-03B

0.80

48.27692

0.01263

0.00000

-0.00071

48.48684

2.99E-14

100.4

553.16

1.50

1510-03C

1.20

49.05062

0.01263

0.00000

-0.00026

49.12643

4.64E-14

100.2

559.44

2.37

1510-03D

1.60

48.86395

0.01311

0.43636

0.00027

48.83196

3.76E-14

99.9

556.55

1.82

1510-03E

2.21

48.61477

0.01346

0.10206

0.00044

48.49635

4.22E-14

99.8

553.26

1.45

1510-03F

2.90

48.66782

0.01241

0.00000

-0.00005

48.68360

4.64E-14

100.0

555.10

1.42

1510-03G

3.71

48.63205

0.01330

0.10480

0.00033

48.54728

5.76E-14

99.8

553.76

1.22

1510-03H

5.19

48.66589

0.01338

0.16287

0.00026

48.60697

3.78E-14

99.9

554.34

1.41

HFT359

bi-otite

1512-01A

0.30

15.07256

0.01393

0.00000

0.01514

10.59829

8.97E-16

70.3

136.22

9.37

1512-01B

0.60

51.66537

0.01638

0.05517

0.00845

49.17328

2.76E-14

95.2

559.89

2.23

1512-01C

0.90

51.95019

0.01523

0.00000

0.00043

51.82215

8.85E-14

99.8

585.64

1.51

1512-01D

1.20

53.30515

0.01644

0.00000

-0.00011

53.33916

1.09E-13

100.1

600.22

1.24

1512-01E

1.60

53.51907

0.01606

0.00000

0.00014

53.47643

9.19E-14

99.9

601.53

1.18

1512-01F

2.01

53.51363

0.01528

0.00000

-0.00004

53.52518

7.78E-14

100.0

602.00

1.15

1512-01G

2.60

53.64821

0.01586

0.00000

0.00019

53.59311

9.23E-14

99.9

602.65

1.43

1512-01H

3.81

53.18658

0.01585

0.00000

0.00004

53.17570

1.34E-13

100.0

598.65

0.99

1512-01J

5.19

53.33733

0.01578

0.00000

0.00016

53.28987

8.99E-14

99.9

599.75

1.79

1512-02A

0.60

46.80206

0.01827

0.04537

0.00809

44.41632

1.91E-14

94.9

512.72

3.66

1512-02B

0.90

52.28705

0.01438

0.00000

0.00051

52.13563

8.46E-14

99.7

588.66

1.40

1512-02C

1.20

53.15884

0.01619

0.00000

0.00042

53.03482

9.99E-14

99.8

597.30

2.52

1512-02D

1.60

53.03467

0.01653

0.07369

0.00002

53.03798

9.91E-14

100.0

597.33

1.04

1512-02E

2.21

53.21001

0.01652

0.00000

0.00000

53.21040

1.13E-13

100.0

598.99

1.03

1512-02F

2.80

53.11870

0.01780

0.01624

0.00071

52.91142

8.61E-14

99.6

596.12

1.03

1512-02G

3.51

53.60608

0.01751

0.00000

0.00010

53.57712

9.83E-14

99.9

602.50

5.36

1512-02H

4.21

53.09559

0.01372

0.00000

-0.00054

53.25413

5.08E-14

100.3

599.41

1.73

1512-02I

5.20

52.92729

0.01539

0.00000

-0.00030

53.01593

8.12E-14

100.2

597.12

1.36

1512-03A

0.60

48.91600

0.01470

0.00000

0.00548

47.29567

3.41E-14

96.7

541.42

2.63

1512-03B

0.90

52.88945

0.01535

0.00000

0.00005

52.87527

9.43E-14

100.0

595.77

1.49

1512-03C

1.20

53.11889

0.01435

0.00000

0.00004

53.10545

9.01E-14

100.0

597.98

5.68

1512-03D

1.60

53.38681

0.01463

0.00000

0.00023

53.31776

7.48E-14

99.9

600.01

1.42

1512-03E

2.21

53.20772

0.01413

0.00000

-0.00019

53.26485

9.15E-14

100.1

599.51

1.38

1512-03F

2.80

53.21023

0.01533

0.00000

0.00047

53.07104

8.64E-14

99.7

597.65

1.96

1512-03G

3.60

52.81300

0.01423

0.00000

-0.00033

52.90967

7.29E-14

100.2

596.10

1.22

1512-03H

5.19

53.17218

0.01454

0.00000

-0.00017

53.22240

6.27E-14

100.1

599.10

2.08

HFT361

bi-otite

1513-01A

0.40

33.57077

0.01787

1.67280

0.01086

30.52820

4.36E-15

90.8

367.48

4.02

1513-01B

0.70

51.89371

0.01388

0.00000

0.00215

51.25701

3.00E-14

98.8

580.18

1.44

1513-01C

1.11

51.72371

0.01381

0.22965

0.00062

51.56535

5.81E-14

99.7

583.16

1.18

1513-01D

1.50

51.99279

0.01290

0.00000

-0.00015

52.03647

5.00E-14

100.1

587.71

1.26

1513-01E

2.01

52.41931

0.01279

0.16044

0.00023

52.36968

4.77E-14

99.9

590.92

1.46

1513-01F

2.60

51.93848

0.01221

0.00000

-0.00022

52.00414

4.72E-14

100.1

587.39

1.38

1513-01G

3.71

51.91488

0.01340

0.16372

0.00044

51.80381

8.72E-14

99.8

585.46

1.41

1513-01H

5.19

51.91198

0.01243

0.23949

-0.00004

51.94912

4.84E-14

100.1

586.86

1.49

1513-02A

0.60

50.61274

0.01676

0.41658

0.00663

48.69906

1.89E-14

96.2

555.25

3.03

1513-02B

0.90

51.91611

0.01475

0.15075

0.00102

51.63257

4.02E-14

99.4

583.81

1.52

1513-02C

1.20

51.60025

0.01463

0.32049

0.00073

51.41916

3.99E-14

99.6

581.75

2.28

1513-02D

1.60

51.99949

0.01361

0.00000

-0.00038

52.11294

3.91E-14

100.2

588.44

1.50

1513-02E

2.21

51.93187

0.01377

0.00000

-0.00020

51.99039

4.77E-14

100.1

587.26

2.53

1513-02F

2.90

51.90506

0.01392

0.00000

-0.00026

51.98079

6.12E-14

100.1

587.17

1.10

1513-02G

3.71

51.69879

0.01344

0.00000

-0.00028

51.78256

5.99E-14

100.2

585.26

1.29

1513-02H

5.19

51.93068

0.01383

0.05790

0.00059

51.76337

2.41E-14

99.7

585.07

1.89

1513-03A

0.60

39.77662

0.01673

0.71093

0.00798

37.49299

1.07E-14

94.2

441.78

2.49

1513-03B

0.90

52.00092

0.01336

0.00000

0.00045

51.86767

4.26E-14

99.7

586.08

1.46

1513-03C

1.20

52.44431

0.01337

0.00000

0.00001

52.44073

5.23E-14

100.0

591.60

1.29

1513-03D

1.60

52.34148

0.01373

0.21195

0.00059

52.19020

5.36E-14

99.7

589.19

1.44

1513-03E

2.21

52.52465

0.01398

0.25242

0.00049

52.40926

5.74E-14

99.8

591.30

1.40

1513-03F

2.90

52.45826

0.01361

0.11253

0.00040

52.35314

5.54E-14

99.8

590.76

1.14

1513-03G

3.71

52.38438

0.01328

0.00639

-0.00008

52.40813

6.96E-14

100.0

591.29

1.30

1513-03H

5.19

52.53130

0.01405

0.02114

0.00011

52.50059

1.05E-13

99.9

592.17

0.93

HFT363B

bi-otite

1515-01A

0.40

47.60705

0.01806

0.00000

0.02141

41.27921

7.84E-15

86.7

480.92

4.01

1515-01B

0.70

46.88261

0.01242

0.00000

0.00036

46.77543

6.94E-14

99.8

536.27

1.23

1515-01C

1.10

47.02590

0.01271

0.00000

0.00024

46.95566

6.72E-14

99.9

538.06

1.29

1515-01D

1.60

46.85513

0.01152

0.00000

-0.00034

46.95503

7.12E-14

100.2

538.05

1.22

1515-01E

2.11

47.01741

0.01212

0.00000

-0.00067

47.21397

4.64E-14

100.4

540.61

1.33

1515-01F

2.80

46.84125

0.01164

0.00000

-0.00072

47.05258

2.91E-14

100.5

539.02

1.47

1515-01G

3.71

46.93276

0.01365

0.00000

0.00094

46.65418

1.75E-14

99.4

535.07

2.40

1515-01H

5.19

46.54282

0.01119

0.00000

-0.00153

46.99397

2.38E-14

101.0

538.43

1.82

HFT363B

bi-otite

1515-02A

0.60

42.03944

0.01534

0.62579

0.00522

40.56233

2.76E-14

96.4

473.57

1.47

1515-02B

0.80

46.98914

0.01308

0.00000

0.00053

46.83252

6.08E-14

99.7

536.83

1.13

1515-02C

1.10

46.93868

0.01286

0.00000

0.00021

46.87678

6.94E-14

99.9

537.27

1.43

1515-02D

1.60

46.85553

0.01250

0.00535

0.00031

46.76344

6.85E-14

99.8

536.15

1.04

1515-02E

2.11

46.87492

0.01260

0.22372

0.00031

46.80804

8.47E-14

99.8

536.59

1.50

1515-02F

3.20

46.83759

0.01266

0.27768

0.00027

46.78840

5.34E-14

99.9

536.40

1.50

1515-02G

5.19

46.81844

0.01298

0.42724

0.00033

46.76838

6.14E-14

99.9

536.20

1.76

1515-03A

0.60

39.04447

0.02235

1.71692

0.03690

28.30908

1.20E-14

72.4

343.15

2.91

1515-03B

0.80

45.42085

0.01495

0.70216

0.00246

44.76962

3.13E-14

98.5

516.27

1.38

1515-03C

1.10

46.64748

0.01293

0.44235

0.00022

46.62974

5.16E-14

99.9

534.82

1.87

1515-03D

1.60

47.01982

0.01231

0.61377

-0.00007

47.10602

3.67E-14

100.1

539.54

2.06

1515-03E

2.11

47.21703

0.01239

0.26841

-0.00035

47.34941

3.81E-14

100.3

541.95

1.49

1515-03F

3.20

47.04982

0.01284

0.56869

0.00046

46.97570

4.60E-14

99.8

538.25

1.46

1515-03G

5.19

46.52022

0.01206

0.40055

-0.00007

46.58493

5.11E-14

100.1

534.38

1.23

HFT363B

muscovite

1516-01A

0.50

60.73212

-0.02158

0.00000

0.02121

54.45636

8.88E-16

89.7

610.88

23.79

1516-01B

0.90

50.02766

0.00910

4.11460

-0.00246

51.21706

2.70E-15

102.1

579.79

8.35

1516-01C

1.40

50.52582

0.01348

0.34005

0.00429

49.29679

2.77E-14

97.5

561.10

2.96

1516-01D

1.90

49.75712

0.01207

0.00000

0.00083

49.51051

1.33E-13

99.5

563.19

1.11

1516-01E

2.31

49.21465

0.01163

0.00000

0.00003

49.20570

1.32E-13

100.0

560.21

1.01

1516-01F

2.80

49.14761

0.01159

0.00000

0.00037

49.03839

3.04E-14

99.8

558.57

2.37

1516-01G

3.71

49.43048

0.01296

0.48050

0.00116

49.13992

2.67E-14

99.4

559.57

1.45

1516-01H

5.19

49.50817

0.01194

0.02230

0.00008

49.48716

1.45E-13

100.0

562.96

1.04

1516-02A

0.90

71.84866

0.04580

0.00000

0.07599

49.39658

1.18E-15

68.8

562.08

24.44

1516-02B

1.40

49.63865

0.01127

0.00000

0.00195

49.06317

3.66E-15

98.8

558.82

5.72

1516-02C

1.70

49.65842

0.01138

0.13537

0.00098

49.38448

4.20E-14

99.4

561.96

1.43

1516-02D

2.01

49.75945

0.01288

0.23468

0.00131

49.39885

3.89E-14

99.3

562.10

1.47

1516-02E

2.40

49.28247

0.01159

0.00000

0.00010

49.25203

1.21E-13

99.9

560.67

0.99

1516-02F

3.71

49.37744

0.01217

0.26165

0.00009

49.37906

2.49E-14

100.0

561.91

1.64

1516-02G

5.19

49.92584

0.01180

0.05221

0.00044

49.79980

8.42E-14

99.7

566.02

1.52

1516-03A

0.90

50.21016

0.02051

1.06109

0.01552

45.74092

4.66E-15

91.0

525.98

5.53

1516-03B

1.40

50.97860

0.01420

0.35140

0.00762

48.76622

2.79E-14

95.6

555.91

2.08

1516-03C

1.70

49.44413

0.01182

0.00000

0.00101

49.14619

6.35E-14

99.4

559.63

1.50

1516-03D

2.01

49.49751

0.01180

0.00000

0.00010

49.46622

1.39E-13

99.9

562.76

1.03

1516-03E

2.40

49.57447

0.01164

0.00000

0.00019

49.51899

8.80E-14

99.9

563.28

1.08

1516-03F

3.71

49.46852

0.01163

0.01378

0.00007

49.44758

9.55E-14

100.0

562.58

1.36

1516-03G

5.20

49.44102

0.01168

0.01347

0.00012

49.40529

2.18E-13

99.9

562.16

1.77

Note

Data from the southern Brasília belt. See text

for details of sample location and description.


Paper 2



Belt Tectonics


Paper 2



Belt Tectonics

virtualexplorer.com.au · Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and...

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