UNIVERSIDADE FEDERAL DE PERNAMBUCOCENTRO DE TECNOLOGIA EM GEOCIÊNCIAS

DEPARTAMENTO DE GEOLOGIA

DISCIPLINA: GEOLOGIA ESTRUTURAL

Tiago Miranda tiagogeoufpe@gmail.com

www.tiagomiranda.org

Tectônica do Sal

Reologia Geometria Diapirismo Exercício

Halocinese

Hudec and Jackson (2006)

Halocinese

Halos = halita; kinesis = movement [halokinesis]

@Fossen, 2016

Caverna Naica [México]

• Mineração Taquari-Vassouras [Sergipe]

• Silvinita (KCl)

Vale

Reologia do sal

Viscosidade

Propriedades físicas

Reologia do sal

Propriedades mecânicas

Material E (Gpa) v (Razão de Poisson)

Ferro 196 0,29

Borracha 0,01-0,1 0,5

Quartzo 72 0,16

Sal 40 ~0,38

Diamante 1.050 -1.200 0,2

Calcário 80 0,15-,03

Arenito 10-20 0,21-0,38

Folhelho 5-70 0,03-0,4

Fluxo

Deformação:??

Exemplo ideal = amortecedor

Anticlinais e diápiros

Decollements

@Fossen, 2016

Couette flow

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Poiseuille flow

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Fluxo

@Fossen, 2016

Loading (cont. margin setting)

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Geometria

@Fossen, 2016

Diapirism experiment (Nettleton

1934)

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Diápiro [Geometria]

Diapirismo

@Fossen, 2016

Diápiro [Geometria]

Planta Dasht-e Kavir, Iran (Fossen, 2016)

Diápiro [Geometria]

Seção

Hudec and Jackson (2006)

Tipos de Diapirismo

@Fossen, 2016

Diápiro [Estruturas]

@Fossen, 2016

Diapirismo

✓Falhas iniciais✓Salt sheet✓Mini-bacias✓Falhas tardias✓Colapso

@Fossen, 2016

Regime Extensional

Reactive diapirism

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Active diapirism

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Passive diapirism

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Passive diapirism, high

sedimentation rate

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Passive diapirism, low sedimentation

rate

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Diapirism: Rise

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Diapirism: Rise and fall

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Diapirismo

✓Diápiro em forma de gota✓Soldagem (weld)✓Derrames de sal (salt sheets)

Regime Contracional

@Fossen, 2016

Contraction of salt diapir

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Diapir squeezing

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Diapirismo Teardrop

Golfo do México, Canyon do Mississippi (Fossen, 2016)

Diapirismo Salt sheets

Hudec and Jacskon (2006)

@Fossen, 2016

Diapirismo Salt sheets

@Fossen (2016)

Colapso de sal

Karstificação

@Fossen, 2016

Allochthonous salt

Animations made by H. Fossen as a resource to Fossen 2016, Structural Geology, Cambridge Univ. Press. Free for non-commercial use

Salt décollements

@Fossen, 2016

Margem passiva do W africano, Senegal

Salt décollements

@Fossen, 2016

Bacia de Santos

Hudec and Jackson (2006)

Hudec and Jackson (2006)

Exercício

1. Desenhe um bloco diagrama com os diferentes tipos de estruturas geradas pela tectônica do sal.

2. Por que o Diapirismo não inicia apenas como um resultado da inversão de densidade?3. Faça um diagrama esquemático com os principais tipos de Diapirismo de acordo com

os ambientes tectônicos.4. Qual a diferença entre Diapirismo ativo e passivo e como podemos identifica-los?5. Ler e comentar o artigo Hudec and Jackson (2007) – Terra infirma: understanding salt

tectonics.

E-module: Salt tectonics