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Geology Notes for Test #2 Chapter 7

Geology Notes for Test #2 Chapter 7 - Geology Notes for...

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Geology Notes for Test #2 Chapter 7 1. Metamorphism- “change form.” The changes in mineral composition and texture of a rock subjected to high temperature and pressure within earth. 2. Why is heat considered the most important agent of metamorphism? It provides the energy to drive chemicals reactions that result in the re-crystallization of existing minerals and/or the formation of new minerals. 3. How is confining pressure different that differential stress? At confining pressure, rocks may be subjected to directed pressure, at differential stress the forces that deform rock are unequal in different directions. 4. What role do chemically active fluids play in metamorphism? Fluids surround mineral grains act as catalysts to promote re-crystallization by enhancing Ion migration. 5. In what two ways can the parent rock affect the metamorphic process? The rock from which a metamorphic rock formed. 6. What is foliation? Distinguish between slaty cleavage, schistosity, and gneissic textures? Foliation- a term for a linear arrangement of textural features often exbihited by metamorphic rocks. Slaty cleavage- the type of foliation
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