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Transcript
3 Types of Metamorphism Miss Holl Rowland High School October 24, 2006 Outline • Regional metamorphism • Contact metamorphism • Hydrothermal metamorphism Regional Metamorphism Definition • Rocks are metamorphosed over large areas that are the size of many states or even several countries Regional Metamorphism • Caused by tectonic plates smashing into each other! Regional Metamorphism Conditions • High pressure • High temperature Plate tectonics • Continents collide (smash into each other) • Ocean crust subducts Regional Metamorphism • Pictures Regional Metamorphism • Himalayan Mountains ContinentContinent Collision! Contact Metamorphism Definition • Hot magma or lava changes (metamorphoses) rocks • Can happen deep underground or at the surface 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) Contact Metamorphism • Pictures Contact Metamorphism • Pictures QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. Hydrothermal metamorphism Hydrothermal Metamorphism Definition • Super-heated ocean water changes rocks • Minerals are dissolved or • mix with ocean water minerals to form new minerals Hydrothermal metamorphism Conditions • Super-heated ocean water emitted from hydrothermal vents on the ocean floor • High heat • No pressure Hydrothermal metamorphism • Pictures Hydrothermal metamorphism • Pictures 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 QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture.