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11 Cards in this Set

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