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3 Types of Metamorphism Miss Holl Rowland High School October 24, 2006
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Outline Regional metamorphism Contact metamorphism Hydrothermal metamorphism
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Regional Metamorphism Definition Rocks are metamorphosed over large areas that are the size of many states or even several countries
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Regional Metamorphism Caused by tectonic plates smashing into each other!
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Regional Metamorphism Conditions High pressure High temperature Plate tectonics Continents collide (smash into each other) Ocean crust subducts
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Regional Metamorphism Pictures
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Regional Metamorphism Himalayan Mountains - Continent- Continent Collision!
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Contact Metamorphism Definition - Hot magma or lava changes (metamorphoses) rocks Can happen deep underground or at the surface
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Contact Metamorphism Conditions low to moderate pressure (P) –Pressures are generally less than 4 kilobars (Kb) low to high temperature (T) –Temperatures of metamorphism vary widely from 400-1000 Celcius (C)
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Contact Metamorphism Pictures
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Contact Metamorphism Pictures
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Hydrothermal metamorphism
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Hydrothermal Metamorphism Definition Super-heated ocean water changes rocks Minerals are dissolved or mix with ocean water minerals to form new minerals
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Hydrothermal metamorphism Conditions Super-heated ocean water emitted from hydrothermal vents on the ocean floor High heat No pressure
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Hydrothermal metamorphism Pictures
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Hydrothermal metamorphism Pictures
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Summary Different conditions create different types of metamorphic rocks High temp, high Pressure - regional metamorphism High temp, low pressure - contact metamorphism Hot water - hydrothermal metamorphism
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