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Unformatted text preview: Chapter 6 1. The process of changing an existing rock to another rock type through heat, pressure, and chemically active fluids. The changes to the rock are both chemical and physical. (Metapmorphism) 2. Average temperature gradient in the surface of the Earth is -- degrees Celsius per kilometer of depth (30) 3. ---- provides the energy to drive chemical and physical changes in the rock.------ causes the rock and its minerals to reorganize into new minerals and take on a form that is more stable at that pressure. Two types of pressure: ------- pressure and --------- pressure. (Heat, Pressure, Confining,differential) 4. --------- - hydrothermal fluids rich in dissolved ions, provide the materials for altering existing minerals and creating new ones. (chemically active fluids) 5. ------- - widespread over a vast area. It is high temperature and high pressure (regional) 6. -------- - Localized area of occurrence. May or may not have high pressure. It is the result of magma intrusions and bakes the surrounding country rock. (contact) 7. -------- - seawater infiltrates hot basalts on the sea floor and chemical reactions alter the basalts (hydrothermal) 8. ------- - the process of diagenesis can grade over into low grade metamorphism. Moderate pressures and moderate heat. (Low grade burial)pressures and moderate heat....
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This document was uploaded on 10/27/2011 for the course GEOL 1001 at LSU.
- Spring '07