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 - Continent- Continent 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 Celcius (C)
Contact Metamorphism Pictures
Contact Metamorphism Pictures
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