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Metamorphic Rock
Question | Answer |
---|---|
Definition of metamorphic rock | Changed rock in a solid state produced from preexisting igneous and sedimentary and other metamorphic rocks |
Change continues until... | A state of equilibrium with a new environment is reached. |
Parent rock | The original material where rock came from (every metamorphic rock has one) |
Heat/Thermal Metamorphism | Most important agent of change that provides the energy needed to drive chemical reactions. |
Pressure/Dynamic Metamorphism | Increases with depth |
Stress Metamorphism | a) Rocks at great depth behave plasticly b) Rocks at the surface are cooler & have a tendency to shear |
Most common chemically active fluid is... | Water containing ions in solution because it dissolves minerals and aids migration & precipitation of material at other sites |
Textural & Mineralogical Changes | Low to high grade metamorphism a) Reflects the degree of metamorphism b) Low grade metamorphism makes rocks more compact & denser |
Pressure causes... | Recrystallization |
Definition of recrystallization | The enlargement of old minerals The birth of new ones The transformation of low temperature minerals to high temperature ones |