3 Types of Metamorphism

Miss Holl

Rowland High School

October 24, 2006

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!

Regional Metamorphism

Conditions• High pressure• High temperaturePlate tectonics• Continents collide (smash into each

other)• Ocean crust subducts

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

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

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Contact Metamorphism

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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

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Hydrothermal metamorphism

• Pictures

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