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METAMORPHICRX - cd/EM F Gre G Dim gory ijian/Photo Re arche...

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Gregory G. Dim ijian/Photo Researchers cd/EM - F
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Metamorphic Rocks Metamorphism Metamorphism : to change form Metamorphic rock Metamorphic rock : any rock (sedimentary, volcanic, plutonic, metamorphic) that has undergone changes in mineralogical or texture composition in the solid solid state. state.
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No single mode of origin Metamorphic rocks result from the partial or complete recrystallization recrystallization of minerals in rocks over long periods of time. Rocks remain essentially solid solid during metamorphism.
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Metamorphic processes HEAT : stability region of mineral sensitive to T . With increased T , pore fluid decreases. PRESSURE : greater pressure tends to decrease space available; metamorphic minerals tend to be dense. Increased P can come from any stress (burial). Directed stress will bring about a preferred orientation of minerals. FLUIDS (H 2 O): acts as a catalyst during metamorphism; aids the exchange of ions between growing crystals.
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Metamorphic grade Refers to the intensity of metamorphism. High grade : high T (>550 0 C) , P Intermediate grade : T (320- 550 0 C), P Low grade : low T (200-320 0 C) , P
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Metamorphic Metamorphic Grade Grade
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Pressure (depth) and Temperature vs. Rock Type vs. Rock Type
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Types of Metamorphism Regional : Widespread changes in temperature
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