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11 Cards in this Set
- Front
- Back
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Metamorphism in 3 settings
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1. Rock intruded by magma
2. Hydrothermal metamorphism 3. Regional metamorphism |
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Agents of Metamorphism
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1. Heat
2. Pressure/Stress 3. Chemically active fluid |
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Most important agent of metamorphism
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Heat
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Sources of heat
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1. Radioactive decay
2. Earth's interior |
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Temps increase with depth
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Geothermal gradient
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Cool rocks that magma intruded at shallow depths
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Baked
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Pressure equal in all directions because of overlying rock
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Confining Pressure
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Pressure unequal
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Differential Stress
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Any planar, nearly flat, arrangement of mineral grains or structural features
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Preferred orientation- Foliation
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Altered rock zones. Contact/thermal metamorphism
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Aureole
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Very hard fine grained metamorphic rock
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Hornfel
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