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
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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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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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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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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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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
Meso/Pa-leoproter-ozoic
Meso/Pa-leoproter-ozoic
Paleopro-terozoic/Archean
Paleopro-terozoic/Archean
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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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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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
foliation(280/12)composedby quartz,muscoviteand biotite
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
foliation(137/17)composedby quartz,muscoviteand biotite
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
foliation(142/23)composedby quartz,muscoviteand biotite
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
foliation(133/15)composedby quartz,muscoviteand biotite
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,
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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).
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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,
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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
para-gneiss/bio-tite
1494 572±1
570±1
572±1
571±1
HFT351
para-gneiss/bio-tite
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
para-gneiss/bio-tite
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
H690 schist/bio-tite
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
H109 schist/bio-tite
1488 492±1
490±1
492±1
491±1
H751 schist/bio-tite
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
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Page 14
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
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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.
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Belt Tectonics
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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
0.00113
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
0.00003
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
-0.00016
17.69516
4.00E-14
100.3
496.95
1.57
0919-02G
2.01
17.72873
0.01063
0.00000
-0.00007
17.74815
2.04E-14
100.1
498.25
1.97
0919-02H
2.50
17.78852
0.01322
0.00000
-0.00275
18.60000
2.03E-15
104.6
519.02
11.14
0919-02I
3.01
17.44783
0.00217
0.00000
0.00083
17.20277
9.47E-16
98.6
484.82
17.78
0919-02J
3.50
17.62887
0.01227
0.00000
-0.00630
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
0.00026
17.38562
7.57E-14
99.6
489.33
1.01
0919-03D
1.20
17.34918
0.01123
0.00000
-0.00002
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
0.00003
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
0.00212
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
0.00009
17.69453
7.92E-14
99.9
496.93
1.38
0921-01H
1.80
17.80844
0.01035
0.00000
-0.00014
17.84768
2.80E-14
100.2
500.69
1.29
0921-01I
2.21
17.97489
0.01014
0.00000
-0.00028
18.05573
1.62E-14
100.5
505.78
2.22
0921-01J
2.60
17.74771
0.00950
0.00000
-0.00019
17.80273
1.24E-14
100.3
499.58
2.51
0921-01K
3.01
17.81626
0.01277
0.00171
0.00071
17.60502
1.37E-14
98.8
494.73
3.35
0921-01L
3.61
17.84461
0.01048
0.00000
0.00002
17.83745
2.55E-14
100.0
500.44
2.02
0921-01M
4.21
17.49554
0.01029
0.00000
0.00078
17.26321
1.34E-14
98.7
486.31
3.83
0921-01N
5.00
17.89140
0.01157
0.00000
0.00028
17.80923
2.39E-14
99.5
499.74
1.34
0921-02A
0.40
17.70765
0.01798
0.11941
0.02594
10.05317
4.19E-16
56.8
298.87
44.91
0921-02B
0.70
19.21502
0.01703
0.01860
0.00752
16.99246
2.30E-15
88.4
479.61
8.98
0921-02C
0.90
18.35333
0.01168
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
0.00065
0.00017
18.01197
9.46E-14
99.7
504.71
1.41
0921-02F
1.50
18.07328
0.01156
0.00027
0.00043
17.94419
3.57E-14
99.3
503.05
1.93
0921-02G
1.90
18.53662
0.01059
0.00000
-0.00094
18.81493
1.13E-14
101.5
524.23
15.30
0921-02H
2.60
17.63450
0.01100
0.00120
0.00122
17.27376
9.01E-15
98.0
486.57
2.56
0921-02I
3.61
18.18203
0.01054
0.00000
0.00024
18.10981
2.38E-14
99.6
507.10
2.73
0921-02J
5.01
17.98396
0.01177
0.00163
0.00039
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
0.01117
0.00062
0.00023
17.87054
6.74E-14
99.6
501.25
1.00
0921-03C
0.90
18.07464
0.01090
0.00000
0.00072
17.86156
4.68E-14
98.8
501.03
0.98
0921-03D
1.10
18.81762
0.01015
0.00000
0.00080
18.58007
1.08E-14
98.7
518.54
2.20
0921-03E
1.30
18.23988
0.01287
0.00000
0.00199
17.65114
1.28E-14
96.8
495.86
2.86
0921-03F
1.50
17.87495
0.01087
0.00000
0.00023
17.80673
2.69E-14
99.6
499.68
1.64
0921-03G
1.90
17.84428
0.01129
0.00000
0.00007
17.82189
7.03E-14
99.9
500.05
1.76
0921-03H
2.40
17.84359
0.01062
0.00000
0.00011
17.81164
2.08E-14
99.8
499.80
1.70
0921-03I
3.01
17.95987
0.00989
0.00000
0.00011
17.92682
1.92E-14
99.8
502.62
1.70
0921-03J
3.61
17.75549
0.01115
0.00000
0.00263
16.97666
5.96E-15
95.6
479.22
4.25
0921-03K
4.22
17.90060
0.00745
0.00000
-0.00155
18.35697
3.90E-15
102.6
513.12
5.07
0921-03L
5.00
18.04344
0.01120
0.00000
0.00066
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
-0.00060
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
0.00024
19.09064
1.53E-13
99.6
530.88
3.12
0922-01G
1.50
18.45298
0.01036
0.00000
0.00018
18.40042
7.37E-14
99.7
514.18
1.84
0922-01H
1.80
18.62752
0.01078
0.00000
0.00036
18.52163
3.22E-14
99.4
517.12
1.24
0922-01I
2.21
19.10159
0.01100
0.00000
0.00004
19.08943
2.85E-14
99.9
530.85
1.14
0922-01J
2.60
18.67329
0.00943
0.00000
-0.00047
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
0.00133
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
-0.00155
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
0.01068
0.00000
0.00009
18.83306
1.02E-13
99.9
524.66
1.35
0922-02G
2.50
18.96249
0.01081
0.00000
0.00010
18.93108
1.74E-14
99.8
527.03
2.30
0922-02H
3.41
19.00797
0.00944
0.00000
-0.00067
19.20436
1.00E-14
101.0
533.62
2.89
0922-02I
4.21
19.24305
0.00964
0.00000
-0.00141
19.65936
6.89E-15
102.2
544.53
3.46
0922-02J
5.00
19.51547
0.01069
0.00000
-0.00006
19.53259
7.24E-14
100.1
541.50
1.13
0922-03A
0.35
19.95250
0.00699
0.00000
0.00273
19.14568
2.42E-15
96.0
532.21
9.43
0922-03B
0.50
18.20611
0.01023
0.00000
0.00115
17.86548
4.77E-15
98.1
501.12
4.78
0922-03C
0.70
19.20956
0.01048
0.00000
0.00033
19.10989
5.52E-14
99.5
531.34
3.22
0922-03D
0.90
18.70610
0.01083
0.00000
0.00013
18.66762
9.17E-14
99.8
520.66
1.20
0922-03E
1.20
18.45496
0.01099
0.00029
0.00010
18.42595
1.08E-13
99.8
514.80
1.70
0922-03F
1.50
18.26814
0.01081
0.00000
0.00023
18.19810
3.68E-14
99.6
509.25
1.14
0922-03G
2.01
18.35685
0.01079
0.00000
0.00040
18.23903
1.17E-14
99.4
510.25
2.76
0922-03H
2.90
18.20906
0.01121
0.00000
0.00202
17.61100
6.94E-15
96.7
494.88
4.83
0922-03I
4.01
18.90572
0.01069
0.00000
0.00247
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
-0.00078
17.58519
3.50E-15
101.3
494.24
5.31
0924-01C
0.50
18.30061
0.01054
0.00000
0.00018
18.24538
1.32E-14
99.7
510.40
1.77
0924-01D
0.70
18.07563
0.01141
0.00000
0.00011
18.04107
3.59E-14
99.8
505.42
1.05
0924-01E
0.90
17.80647
0.00993
0.00000
-0.00004
17.81816
6.93E-14
100.1
499.96
1.12
0924-01F
1.10
17.68447
0.01105
0.00000
-0.00037
17.79320
3.73E-14
100.6
499.35
0.92
0924-01G
1.30
17.66318
0.01013
0.00000
-0.00142
18.08351
1.35E-14
102.4
506.45
3.14
0924-01H
1.60
17.64254
0.00949
0.00000
-0.00044
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
0.00044
17.70588
1.58E-14
99.3
497.21
2.54
0924-01L
3.61
17.66063
0.01105
0.00364
0.00016
17.61427
1.14E-14
99.7
494.96
3.33
0924-01M
4.21
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3.64
0924-01N
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4.24
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263.97
23.62
0924-02B
0.35
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15.73293
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95.2
448.12
7.06
0924-02C
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2.31
0924-02D
0.80
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0924-02E
1.00
18.23731
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18.36787
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1.62
0924-02F
1.20
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0924-02G
1.50
17.83868
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1.90
0924-02H
1.90
17.90514
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17.97753
2.94E-14
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2.65
0924-02I
2.60
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18.13416
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101.0
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1.83
0924-02J
3.50
17.69379
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17.72724
3.12E-14
100.2
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1.10
0924-02K
4.21
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17.99975
2.28E-14
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2.08
0924-02L
5.00
17.86297
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0924-03A
0.20
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18.70709
9.11E-16
121.8
521.62
16.76
0924-03B
0.35
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0924-03C
0.60
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0924-03D
0.80
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99.7
508.12
1.20
0924-03E
1.00
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1.63
0924-03F
1.20
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1.51
0924-03G
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99.7
494.58
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0924-03H
2.60
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2.27
0924-03I
3.50
17.79914
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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
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0.00000
0.00030
18.78786
6.40E-14
99.5
523.57
1.28
0927-01E
0.90
19.04198
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0.00000
0.00030
18.95309
1.05E-13
99.5
527.56
1.08
0927-01F
1.20
18.82614
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0.00000
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18.80382
1.06E-13
99.9
523.96
0.95
0927-01G
1.50
18.63888
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18.67874
4.91E-14
100.2
520.93
0.99
0927-01H
1.90
18.70713
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18.89532
2.14E-14
101.0
526.17
1.61
0927-01I
2.40
18.47297
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18.42670
1.76E-14
99.8
514.81
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0927-01J
3.20
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96.8
511.41
5.12
0927-01K
4.21
19.00895
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18.83201
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99.1
524.64
4.76
0927-01L
5.01
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4.40
0927-02A
0.20
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62.5
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0927-02B
0.35
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0927-02C
0.55
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0927-02D
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0927-02E
0.90
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0927-02F
1.30
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0927-02G
1.70
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0927-02H
2.21
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99.9
512.87
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0927-02I
2.70
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0927-02J
3.20
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0927-02K
4.21
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0927-02L
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0927-03A
0.25
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0927-03B
0.45
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0927-03C
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0927-03D
0.90
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99.6
533.53
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0927-03E
1.20
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518.64
5.33
0927-03F
1.60
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0927-03G
2.11
18.58188
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100.1
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0927-03H
2.90
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0927-03I
3.81
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99.0
534.30
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0927-03J
5.00
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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
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0.00000
0.00502
19.40439
7.59E-15
92.9
538.42
3.75
0928-01D
0.70
19.14827
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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
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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
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134.85790
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104.6
2216.74
99.14
0928-02A
0.20
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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
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17.73053
1.35E-14
97.6
497.81
2.53
0928-02D
0.80
18.62442
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3.83E-14
98.3
512.07
2.35
0928-02E
1.10
18.39925
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99.8
513.30
1.01
0928-02F
1.40
18.22649
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100.0
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0928-02G
1.90
18.39205
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100.4
515.55
1.49
0928-02H
2.41
18.61056
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18.83368
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101.2
524.68
3.75
0928-02I
2.90
18.26818
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99.7
509.62
3.02
0928-02J
3.50
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501.92
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0928-02K
4.31
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18.21466
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99.2
509.65
2.68
0928-02L
5.01
18.49197
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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
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0.00002
18.27227
3.05E-14
100.0
511.06
1.67
0928-03H
2.80
18.25043
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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
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0.00000
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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
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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
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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
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19.94757
8.19E-14
100.1
551.41
3.88
0929-02A
0.20
9.40600
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8.87696
5.75E-16
94.4
266.35
18.20
0929-02B
0.35
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96.0
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9.34
0929-02C
0.55
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19.17116
6.39E-15
95.0
532.82
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0929-02D
0.80
19.96727
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19.82741
3.34E-14
99.3
548.54
2.72
0929-02E
1.00
19.70589
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19.64524
1.07E-13
99.7
544.19
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0929-02F
1.30
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19.63451
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0929-02G
1.70
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19.40261
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99.8
538.38
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0929-02H
2.31
18.95207
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18.92776
5.07E-14
99.9
526.95
1.35
0929-02I
3.01
19.28413
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19.39341
1.87E-14
100.6
538.16
3.24
0929-02J
4.41
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19.57243
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99.8
542.45
3.27
0929-02K
5.00
20.03189
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20.03230
7.44E-14
100.0
553.42
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0929-03A
0.25
19.01764
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13.47615
3.66E-15
70.9
390.29
7.49
0929-03B
0.40
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18.42621
6.22E-15
91.7
514.80
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0929-03C
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2.44E-14
93.8
524.13
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0929-03D
0.90
18.86794
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18.77550
1.28E-13
99.5
523.27
1.98
0929-03E
1.20
18.83002
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0.00013
18.79034
7.08E-14
99.8
523.63
1.24
0929-03F
1.60
18.70814
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18.79854
1.94E-14
100.5
523.83
1.52
0929-03G
2.21
18.87299
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18.74010
1.36E-14
99.3
522.42
2.14
0929-03H
3.31
18.70799
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18.59989
6.09E-15
99.4
519.02
4.91
0929-03I
4.51
19.53382
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19.37553
1.99E-14
99.2
537.73
1.53
0929-03J
5.00
19.53593
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19.99101
6.32E-15
102.3
552.44
3.80
FDA
muscovite
0931-01A
0.20
23.65924
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0.54860
0.08147
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1.99E-16
-1.6
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162.09
0931-01B
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2.60E-16
39.5
334.78
122.11
0931-01C
0.50
18.83294
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0.02726
0.02458
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4.33E-16
61.4
339.95
44.56
0931-01D
0.70
20.67170
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0.03366
0.01786
15.39570
1.60E-15
74.5
439.60
14.31
0931-01E
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0.00603
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90.6
482.50
4.46
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0931-01J
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0931-01K
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0931-01L
5.00
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1.68E-14
99.7
494.18
2.46
FDA
muscovite
0931-02A
0.25
31.94170
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2.50E-16
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173.40
0931-02B
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108.8
571.78
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0931-02C
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34.26534
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15.49553
1.82E-15
45.2
442.13
24.12
0931-02D
0.90
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0931-02E
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92.9
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0931-02G
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0931-02H
3.01
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99.1
486.85
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0931-02I
4.22
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100.0
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0931-02J
5.00
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0931-03A
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0931-03G
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0931-03H
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0931-03J
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3.60E-14
99.5
497.53
3.78
FDA
bi-otite
0932-01A
0.20
17.21264
0.01896
0.09790
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5.35E-16
25.4
136.11
41.10
0932-01B
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72.4
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7.28
0932-01C
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95.8
478.43
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0932-01D
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0932-01E
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99.8
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0932-01F
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99.4
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0932-01G
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0932-01H
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0932-01I
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0932-01J
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0932-01K
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7.01
0932-01L
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0932-02A
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80.3
178.90
12.05
0932-02B
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94.7
435.93
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0932-02C
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0932-02D
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501.68
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0932-02E
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0932-02F
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0932-02G
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0932-02H
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323.62
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0932-03B
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0932-03C
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0932-03D
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0932-03E
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0932-03F
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0932-03G
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0932-03H
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0932-03I
3.81
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100.1
501.39
1.14
0932-03J
5.00
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17.81047
7.32E-15
99.7
499.77
2.76
SPA0203-73
H693C
bi-otite
1485-01A
0.40
34.32230
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0.00000
0.01000
31.36175
8.57E-16
91.4
394.05
17.90
1485-01B
0.80
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4.45E-14
99.6
569.97
1.62
1485-01C
1.20
48.56305
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48.57803
9.24E-14
100.0
578.61
2.16
1485-01D
1.60
48.08352
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0.00000
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48.09930
7.01E-14
100.0
573.72
1.24
1485-01E
2.01
48.03500
0.01158
0.00000
0.00047
47.89474
5.58E-14
99.7
571.63
1.96
1485-01F
2.50
48.19335
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0.00014
48.15118
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99.9
574.25
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1485-01G
3.01
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47.95547
4.51E-14
100.0
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1.33
1485-01H
3.81
48.24803
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100.1
575.60
1.32
1485-01I
5.19
48.44019
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0.00010
48.41141
1.36E-13
99.9
576.91
1.88
H693C
bi-otite
1485-02A
0.60
48.57027
0.00913
0.00000
0.00172
48.06062
4.91E-14
99.0
573.33
1.94
1485-02B
1.10
48.65023
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0.00024
48.57764
9.75E-14
99.9
578.60
1.54
1485-02C
1.60
48.42004
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48.44520
6.02E-14
100.1
577.25
1.71
1485-02D
2.21
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48.52657
6.06E-14
99.7
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1485-02E
3.01
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48.65985
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99.8
579.44
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1485-02F
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580.52
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1485-02G
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103.0
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1485-02H
5.19
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1485-03A
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1485-03B
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1485-03C
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1485-03D
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1485-03E
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1485-03F
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1485-03G
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1485-03H
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583.06
1.92
H109
bi-otite
1488-01A
0.40
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0.04266
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72.1
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1488-01B
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96.0
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1488-01D
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1488-01E
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99.6
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1488-01F
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1488-02B
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1488-02C
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1488-03B
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1488-03C
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1488-03D
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1488-03E
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1488-03F
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1488-03G
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1488-03H
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484.65
3.10
H465
bi-otite
1489-01A
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1489-01B
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1489-01C
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1489-01D
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1489-01F
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1489-01G
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1489-01I
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1489-02A
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1489-02B
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H687B
bi-otite
1501-01A
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H687B
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H690
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SPA0104-46
HFT353B
bi-otite
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HFT355
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HFT355
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1.59
1507-03G
5.19
52.33942
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52.36954
8.21E-14
100.1
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
0.01220
0.35655
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49.40664
2.80E-14
99.1
562.18
1.64
1509-01C
1.40
50.17726
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50.08379
1.18E-13
99.8
568.79
1.29
1509-01D
1.90
49.80822
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0.00015
49.77240
6.04E-14
99.9
565.75
1.23
1509-01E
2.50
50.11164
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0.91445
0.00041
50.09216
1.04E-14
99.9
568.87
3.28
1509-01F
3.20
49.83175
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0.00013
49.87853
7.06E-15
100.0
566.79
2.72
1509-01G
4.51
48.98747
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49.09124
3.39E-15
100.0
559.09
8.30
1509-01H
5.19
50.03781
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49.94691
1.46E-14
99.8
567.45
2.48
1509-02A
0.60
45.93545
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42.56454
7.42E-15
92.7
494.02
3.78
1509-02B
1.00
49.97169
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0.00013
49.93957
4.22E-14
99.9
567.38
1.41
1509-02C
1.20
49.70059
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49.62350
6.28E-14
99.8
564.30
1.18
1509-02D
1.40
49.44475
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4.64E-14
100.2
563.66
1.55
1509-02E
1.90
49.59956
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49.48252
5.33E-14
99.8
562.92
2.70
1509-02F
3.81
50.06295
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50.18993
3.67E-14
100.3
569.82
2.08
1509-02G
5.19
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49.89853
2.94E-14
100.3
566.98
1.54
1509-03A
0.60
40.55608
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41.21450
4.89E-15
101.6
480.26
3.82
1509-03B
1.00
50.41168
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50.55576
3.37E-14
100.3
573.38
1.91
1509-03C
1.20
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4.90E-14
100.4
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2.07
1509-03D
1.40
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49.93715
2.44E-14
100.4
567.36
1.46
1509-03E
1.90
49.72871
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49.72150
8.66E-14
100.0
565.25
1.14
1509-03F
3.81
49.84814
0.01127
0.00000
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49.87787
3.21E-14
100.1
566.78
1.64
1509-03G
5.20
50.07793
0.01119
0.00000
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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
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49.93359
7.67E-14
100.1
567.32
1.11
1510-02A
0.50
44.70603
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0.00000
0.00049
44.55893
3.73E-15
99.7
514.15
4.72
1510-02B
0.80
49.95340
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0.00128
49.57369
2.29E-14
99.2
563.81
1.59
1510-02C
1.20
50.04196
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50.11942
4.06E-14
100.2
569.13
1.66
1510-02D
1.60
49.81152
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49.78342
5.09E-14
99.9
565.86
1.39
1510-02E
2.21
50.11614
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50.17690
4.67E-14
100.1
569.69
1.39
1510-02F
2.90
50.04414
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49.87446
3.61E-14
99.6
566.75
1.72
1510-02G
3.71
50.20539
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0.00011
50.17274
3.74E-14
99.9
569.65
1.59
1510-02H
5.20
49.89854
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49.83117
1.02E-13
99.9
566.32
1.08
1510-03A
0.50
46.02721
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44.90551
5.01E-15
97.6
517.63
4.52
1510-03B
0.80
48.27692
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48.48684
2.99E-14
100.4
553.16
1.50
1510-03C
1.20
49.05062
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49.12643
4.64E-14
100.2
559.44
2.37
1510-03D
1.60
48.86395
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0.00027
48.83196
3.76E-14
99.9
556.55
1.82
1510-03E
2.21
48.61477
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48.49635
4.22E-14
99.8
553.26
1.45
1510-03F
2.90
48.66782
0.01241
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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
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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
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53.52518
7.78E-14
100.0
602.00
1.15
1512-01G
2.60
53.64821
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53.59311
9.23E-14
99.9
602.65
1.43
1512-01H
3.81
53.18658
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53.17570
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1512-01J
5.19
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53.28987
8.99E-14
99.9
599.75
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1512-02A
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44.41632
1.91E-14
94.9
512.72
3.66
1512-02B
0.90
52.28705
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52.13563
8.46E-14
99.7
588.66
1.40
1512-02C
1.20
53.15884
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53.03482
9.99E-14
99.8
597.30
2.52
1512-02D
1.60
53.03467
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53.03798
9.91E-14
100.0
597.33
1.04
1512-02E
2.21
53.21001
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53.21040
1.13E-13
100.0
598.99
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1512-02F
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53.11870
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52.91142
8.61E-14
99.6
596.12
1.03
1512-02G
3.51
53.60608
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53.57712
9.83E-14
99.9
602.50
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1512-02H
4.21
53.09559
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53.25413
5.08E-14
100.3
599.41
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1512-02I
5.20
52.92729
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53.01593
8.12E-14
100.2
597.12
1.36
1512-03A
0.60
48.91600
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47.29567
3.41E-14
96.7
541.42
2.63
1512-03B
0.90
52.88945
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0.00005
52.87527
9.43E-14
100.0
595.77
1.49
1512-03C
1.20
53.11889
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0.00004
53.10545
9.01E-14
100.0
597.98
5.68
1512-03D
1.60
53.38681
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53.31776
7.48E-14
99.9
600.01
1.42
1512-03E
2.21
53.20772
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53.26485
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100.1
599.51
1.38
1512-03F
2.80
53.21023
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53.07104
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99.7
597.65
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1512-03G
3.60
52.81300
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52.90967
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100.2
596.10
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1512-03H
5.19
53.17218
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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
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0.00000
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51.25701
3.00E-14
98.8
580.18
1.44
1513-01C
1.11
51.72371
0.01381
0.22965
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51.56535
5.81E-14
99.7
583.16
1.18
1513-01D
1.50
51.99279
0.01290
0.00000
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52.03647
5.00E-14
100.1
587.71
1.26
1513-01E
2.01
52.41931
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52.36968
4.77E-14
99.9
590.92
1.46
1513-01F
2.60
51.93848
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52.00414
4.72E-14
100.1
587.39
1.38
1513-01G
3.71
51.91488
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51.80381
8.72E-14
99.8
585.46
1.41
1513-01H
5.19
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51.94912
4.84E-14
100.1
586.86
1.49
1513-02A
0.60
50.61274
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48.69906
1.89E-14
96.2
555.25
3.03
1513-02B
0.90
51.91611
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51.63257
4.02E-14
99.4
583.81
1.52
1513-02C
1.20
51.60025
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51.41916
3.99E-14
99.6
581.75
2.28
1513-02D
1.60
51.99949
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52.11294
3.91E-14
100.2
588.44
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1513-02E
2.21
51.93187
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4.77E-14
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1513-02F
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587.17
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1513-02G
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1513-02H
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1513-03A
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94.2
441.78
2.49
1513-03B
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52.00092
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99.7
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1513-03C
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52.44431
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1513-03D
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1513-03E
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1513-03H
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99.9
592.17
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HFT363B
bi-otite
1515-01A
0.40
47.60705
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0.00000
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41.27921
7.84E-15
86.7
480.92
4.01
1515-01B
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99.8
536.27
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1515-01C
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99.9
538.06
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1515-01E
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47.01741
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4.64E-14
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540.61
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1515-01F
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1515-01G
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1515-01H
5.19
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2.38E-14
101.0
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1.82
HFT363B
bi-otite
1515-02A
0.60
42.03944
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40.56233
2.76E-14
96.4
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1515-02B
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99.7
536.83
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1515-02C
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99.9
537.27
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1515-02D
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6.85E-14
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1515-02E
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46.80804
8.47E-14
99.8
536.59
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1515-02F
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5.34E-14
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1515-03A
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1515-03B
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1515-03C
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1515-03D
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2.06
1515-03E
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1515-03F
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538.25
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1515-03G
5.19
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5.11E-14
100.1
534.38
1.23
HFT363B
muscovite
1516-01A
0.50
60.73212
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8.88E-16
89.7
610.88
23.79
1516-01B
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102.1
579.79
8.35
1516-01C
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50.52582
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97.5
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1516-01D
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1516-01E
2.31
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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.
Journal of the Virtual Explorer, 2004Volume 17
Paper 2
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
Page 19
Journal of the Virtual Explorer, 2004Volume 17
Paper 2
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
Page 20
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