fig. ta 7.1

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Fig. Ta 7.1

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Fig. Ta 7.1. Fig. 7.2. Fig. 7.3. Fig. 7.5. Fig. 7.4. Fig. 7.19. Fig. 7.6. Fig. 7.10a. Fig. 7.10b. Fig. 7.11. Fig. 7.12. Fig. 7.13. Fig. 7.1. Fig. 7.9. Fig. 7.8. Factors Affecting Metamorphism. Metamorphic Sequence Sedimentary Metamorphic Igneous. Fig. 7.14. Fig. 7.15. Fig. 7.16. - PowerPoint PPT Presentation

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Page 1: Fig. Ta  7.1

Fig. Ta 7.1

Page 2: Fig. Ta  7.1

Metamorphism- Changing one kind of rock into

another below the zone of weathering and without complete melting of the rock.

Page 3: Fig. Ta  7.1

Causes of metamorphism- 1. Heat 2. Pressure 3. Chemically active fluids

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1. Heat a. accelerates chemical

reactions b. activates fluids in

the rocks

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2. Pressure a. lithostatic b. differential (shear

stress)

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Fig. 7.2

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Fig. 7.3

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Fig. 7.5

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Fig. 7.4

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3. chemically active fluids, esp. water

a. solvent b. catalys c. transfers heat

Page 11: Fig. Ta  7.1

Metasomatism- involves a substantial, simultaneous addition and removal of ions from the rock by hydrothermal solutions.

Page 12: Fig. Ta  7.1

basalt + hydrothermal solution silicon, potassium, sodium “granite” + hydrothermal solution iron, magnesium

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Types of metamorphism

1. Contact – caused by a. heat b. chemically

active fluids

Page 14: Fig. Ta  7.1

Fig. 7.19

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2. Regional (dynamothermal)-

caused by a. Heat b. Differential (directed pressure (shear stress) resulting in foliation.

Page 16: Fig. Ta  7.1

Changes caused by metamorphism 1. Increase in grain size 2. Formation of new

minerals – talc, chlorite, garnet and staurolite

3. Textural rearrangement i.e., foliation

Page 17: Fig. Ta  7.1

Classification 1. Foliated

a. Slate (shale) b. Phyllite c. Schist

ii. d. Gneiss

2. Non-foliated Calcite a. Marble Dolomite b. metaquartzite

L A Y E R E D

BANDED

Page 18: Fig. Ta  7.1

Fig. 7.6

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Classification 1. Foliated

a. Slate (shale) b. Phyllite c. Schist

ii. d. Gneiss

L A Y E R E D

BANDED

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Fig. 7.10a

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Fig. 7.10b

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Fig. 7.11

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Fig. 7.12

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Fig. 7.13

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Fig. 7.1

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Fig. 7.9

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1. Non-foliated Calcite

a. Marble Dolomite

b. metaquartzite Limestone Marble

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Fig. 7.8

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Quartzite metaquartzite

Page 30: Fig. Ta  7.1

Classification 1. Foliated

a. Slate (shale) b. Phyllite c. Schist

ii. d. Gneiss

2. Non-foliated Calcite a. Marble Dolomite b. metaquartzite

L A Y E R E D

BANDED

Page 31: Fig. Ta  7.1

Lowest temperature of formation most susceptible.

Solubility also important.

Factors Affecting Metamorphism

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Metamorphic Sequence

SedimentaryMetamorphic

Igneous

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Within Rock Types

Rock Type Kind Sedimentary Limestone* Igneous Granite Metamorphic Slate

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Fig. 7.14

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Fig. 7.15

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Fig. 7.16

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Fig. 7.18

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Fig. 7.21

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Box 7.1.1

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Box 7.2.1

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Box 7.3.1

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Box 7.3.2