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20 Cards in this Set
- Front
- Back
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Metamorphic rocks form through _______-________ _______ of ________ rock by ________ and ________ .
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solid-state alteration, preexisting, heat, stress
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Metamorphic changes include:
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- production of new minerals
- changes in texture |
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Protolith
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preexisting rock
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Protolith may be ________, ________, or ________ rock.
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igneous, sedimentary, metamorphic
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Stress may be:
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- tension (pulling)
- compression (squeezing) - shear (wrenching) |
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At depth, rocks typically experience _________ _________ ________ .
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uniform compressive stress
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Differential stress
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greater compression in direction of collision
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At the base of a mountain range caused by collision, rocks experience _________ _________ .
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differential stress
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In a fault zone, rocks experience _________ _________ .
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shear stress
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Foliation
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preferred alignment of grains resulting from differential stress
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Foliation produces __________ __________ .
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planar fabric
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Requirements for foliation
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- platy or elongate grains present
- differential stress |
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Where does regional metamorphism occur?
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at depth beneath collision mountain range
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Regional metamorphism involves ________ ________ _______ in the direction of the ________ .
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strong compressive stress, collision
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Regional metamorphism can create _______ and _______ metamorphic rocks.
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foliated nonfoliated
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Where does contact metamorphism occur?
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near the surface
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Contact metamorphism is due to ________ with ________ _________ .
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contact, hot intrusion
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Contact metamorphism create _________ metamorphic rocks only.
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nonfoliated
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Where does hydrothermal metamorphism occur?
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mid-ocean ridges
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Hydrothermal metamorphism is due to _________ that has been _________ _________ by _________ _________ ________ .
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basalt, chemically altered, circulating hot water
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