fig. ta 7.1
DESCRIPTION
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 PresentationTRANSCRIPT
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Fig. Ta 7.1
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Metamorphism- Changing one kind of rock into
another below the zone of weathering and without complete melting of the rock.
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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
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Metasomatism- involves a substantial, simultaneous addition and removal of ions from the rock by hydrothermal solutions.
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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
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Fig. 7.19
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2. Regional (dynamothermal)-
caused by a. Heat b. Differential (directed pressure (shear stress) resulting in foliation.
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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
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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
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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
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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
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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