Transcript 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
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
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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.