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3 Types of Metamorphism

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.

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3 Types of Metamorphism

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  1. 3 Types of Metamorphism Miss Holl Rowland High School October 24, 2006

  2. Outline • Regional metamorphism • Contact metamorphism • Hydrothermal metamorphism

  3. Regional Metamorphism Definition • Rocks are metamorphosed over large areas that are the size of many states or even several countries

  4. Regional Metamorphism • Caused by tectonic plates smashing into each other!

  5. Regional Metamorphism Conditions • High pressure • High temperature Plate tectonics • Continents collide (smash into each other) • Ocean crust subducts

  6. Regional Metamorphism • Pictures

  7. Regional Metamorphism • Himalayan Mountains - Continent-Continent Collision!

  8. Batholith aureole Contact Metamorphism Definition - • Hot magma or lava changes (metamorphoses) rocks • Can happen deep underground or at the surface

  9. 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 400-1000Celcius (C)

  10. Contact Metamorphism • Pictures

  11. 20 feet Contact Metamorphism • Pictures

  12. Hydrothermal metamorphism

  13. Hydrothermal Metamorphism Definition • Super-heated ocean water changes rocks • Minerals are dissolved or • mix with ocean water minerals to form new minerals

  14. Hydrothermal metamorphism Conditions • Super-heated ocean water emitted from hydrothermal vents on the ocean floor • High heat • No pressure

  15. Hydrothermal metamorphism • Pictures

  16. Hydrothermal metamorphism • Pictures

  17. 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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