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GLG 101 Ch 8
Vocab
| Question | Answer |
|---|---|
| Aureole | a zone or halo of contact metamorphism found in the country rock surrounding and igneous intrusion |
| Burial metamorphism | low-grade metamorphism that occurs in the lowest layers of very thick accumulations of sedimentary strata |
| Confining pressure | an equal, all-sided pressure |
| Contact metamorphism | changes in rock caused by the heat from a nearby magma body |
| Differential stress | forces that are unequal in different directions |
| Foliation | a term for linear arrangement of textural features often exhibited by metamorphic rocks |
| Gneiss | a high-grade foliated metamorphic rock with a banded appearance |
| Gneissic texture | A texture of metamorphic rocks in which dark and light silicate minerals are separated, giving the rock a banded appearance |
| Hydrothermal metamorphism | chemical alterations that occur as hot, ion-rich water circulates through fractures in rock |
| Hydrothermal solution | the hot, watery solution that escapes from a mass of magma during the later stages of crystallization |
| Impact metamorphism | metamorphism that occurs when meteorites strike Earth's surface |
| Index mineral | a mineral that is a good indicator of the metamorphic environment in which it formed |
| Marble | an unfoliated metamorphic rock composed of calcite |
| Metamorphic facies | a group of associated minerals that are used to establish the pressures and temperature at which rocks undergo metamorphism |
| Metamorphism | the changes in mineral composition and texture of a rock subjected to high temperature and pressure with Earth |
| Metasomatism | a metamorphic change in composition by the interaction with fluids around magma body |
| Nonfoliated texture | a texture of metamorphic rocks in which there is no linear arrangement of textural features |
| Parent rock | the rock from which a metamorphic rock formed |
| Phyllite | gradation in the degree of metamorphism between slate and schist, glossy sheen, wavy texture, fine crystals of muscovite, chlorite |
| Quartzite | an unfoliated metamorphic rock composed of quartz |
| Regional metamorphism | metamorphism associated with large-scale mountain building |
| Rock cleavage | the tendency of rocks to split along parallel, closely spaced surfaces |
| Schist | a medium to coarse grained foliated metamorphic rock in which platy minerals are visible |
| Schistosity | a type of floatation characterized by parallel arrangement of platy minerals |
| Shield | a large, relatively flat expanse of ancient igneous and metamorphic rocks with the craton |
| Shock metamorphism | metamorphism caused when high-speed projectiles (meteorites) impact Earth |
| Slate | a low-grade foliated metamorphic rock that is fine-grained and composed of undiscernible platy minerals |
| Slaty cleavage | the type of foliation in which there is parallel arrangement of fine-grained metamorphic minerals |
| Texture | the size, shape, and distribution of the particles that collectively constitute a rock |
| Thermal metamorphism | changes in rock caused by the heat from a nearby magma body |
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