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9 Cards in this Set
- Front
- Back
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How do metamorphic rocks form? Why is the theory of plate tectonics so useful in understanding how metamorphic rocks form and what they mean?
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a rock that changed from one form to another as the result of a change in temperature and/or pressure.
no melting or weathering solid state recrystallization |
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What is the difference between foliated and non-foliate rocks?
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Foliated - have sheet-like or elongate minerals that have grown roughly parallel to each other. Directed pressure.
Nonfoliated - lack minerals to foliate |
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What are the protoliths of marble and quartzite? (starting rock)
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limestone and quartz respectively
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Difference between lithostatic and directed pressure?
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Litho - same in all directions
directed - extra squeezing from the sides due to tectonic compression |
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What 2 types of meamorphism occur along subduction zones?
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Contact and Bluechist
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What is contact metamorphism?
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an intrusive blob of magma bakes the rocks it comes in contact with.
small zone |
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Where does bluechist metamorphism occur?
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forms under high pressure and remarkably low temperatures.
Subduction zones, partial melting causes low temperatures |
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What is regional metamorphism, what causes it, and why does it affect a large area?
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continents collide and rocks at the surface are pushed under overriding plate. These rocks heat up as Earth continues to lose heat from its interior + directed pressure. Erosion exposes the vast areas
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Metamorphic grade of shale, schist,gneiss,migmatite?
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Low-Very High
Slate, schist, gneiss, migmatite Any further and it would be igneous. |
