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13 Cards in this Set
- Front
- Back
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metamorphism
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change that occurs in rocks involving a recrystallization of minerals and crystallization of new minerals
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primary agents that drive metamorphism
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temperature and pressure
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3 types of metamorphism
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regional metamorphism
contact metamorphism blueschist metamorphism |
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regional metamorphism
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rocks that have been deformed and metamorphosed at great depth in crust
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contact metamorphism
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rocks heated by intruding magma
increase in their temperature causes them to metamorphose magmas often rise to very shallow level in crust, carrying heat to low pressure environments heat is conducted into rocks the magma intrude HIGH TEMPERATURE, LOW PRESSURE |
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blueschist metamorphism
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LOW TEMPERATURE, HIGH PRESSURE
at convergent plate boundaries, cold and dense plates are subducted into hot and less dense mantle silicate rocks conduct heat slowly so subducting plates reach great depths before warming up |
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foliation
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textural fabrics that develop as rocks are being deformed
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3 types of foliation
compositional banding |
alternating bands of different minerals
light color bands rich in feldspars and quartz dark color bands rich in biotite and amphiboles GNEISS ROCKS |
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3 types of foliation
parallel alignment of flat minerals |
planes are perpendicular to principal compressional stress during deformation
SCHIST ROCKS |
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3 types of foliation
incipient plane of weaknesses along which a rock easily breaks |
yields a flat, smooth surface
planes in which microscopic mica grains crystallize during metamorphism forms perpendicular to the principle of compressional stress SLATE ROCKS |
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metamorphic rocks with 3 types of foliation form during
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regional and blueschist metamorphism
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common metamorphic rocks that form during regional metamorphism (unfoliated or foliation is weak)
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quartzite
marble amphibolite |
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index minerals
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characterize various grades of metamorphism
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