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27 Cards in this Set
- Front
- Back
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This major rock group consists of rocks that have changed from other rocks
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metamorphic
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Which type of metamorphism is associated with convergent plate boundaries?
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regional
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Which type of metamorphism is associated with divergent plate boundaries?
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hydrothermal
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Name the agents or causes of metamorphism |
heat pressure and chemically active fluids |
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What type of pressure is equal in all directions?
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lithostatic
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Fine-grained dense nonfoliated metamorphic rock produced by contact metamorphism
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hornfels
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What condition must always exist for rocks to develop foliation during metamorphism?
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differential/directed stress or pressure
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Foliated metamorphic rock characterized by a satiny sheen
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phyllite
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Which type of metamorphism is due to hot chemically active fluids?
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hydrothermal
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Which type of metamorphism produces mylonites?
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fault-zone
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What is foliation? |
the parallel alignment of minerals in a metamorphic rock due to differential pressure (minerals align perpendicular to the direction of compression) |
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What type of rock is produced if the parent rock is exposed to such high temperatures that it partially melts?
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migmatite
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Foliated metamorphic rock with large visible mica flakes giving it a scaly or glittery appearance
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schist
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parent rock was bituminous coal
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anthracite
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What do we call the minerals that are used as indicators of metamorphic grade or temperature?
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index minerals
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What type of rock is produced if the parent rock is exposed to such high temperatures that it completely melts?
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igneous
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Name 4 changes to the parent rock that could occur during metamorphism. |
more compact/dense recrystallization larger crystals new minerals change in overall composition foliation |
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What causes the marbling or swirling bands in some marble?
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thin inter-beds or layers of shale within the limestone
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Which type of metamorphism produces the largest volume of metamorphic rock?
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regional
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How do fissility and rock cleavage directions differ with respect to the bedding?
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fissility is parallel to the bedding while rock cleavage is often perpendicular to the bedding |
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Low Grade metamorphism |
Parent rock changed little (muscovite ) |
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Intermediate Metamorphism |
Parent rock changed noticeably |
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High Grade |
Extreme heat |
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3 major types / environments of metamorphism |
Contact Hydrothermal regional |
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what causes contact metamorphism / Aureole rocks |
Heat from magma |
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what is the aureole ? |
Zone of metamorphic rocks |
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Hydrothermal Metamorphism and where would you find one? |
Chemical alterations from hot, Iron rich water Found at hydrothermal vents, ridges, hot springs geysers |
