Comment: 12:11 - 12:46 (00:35)
Source: Annenberg/CPB Resources - Earth Revealed - 18. Metamorphic Rocks
Keywords: "metamorphic rock", temperature, magma, orogeny, crust, intrusion, "migrating fluid", "chemical reaction", protolith, pressure
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Our transcription: Fluids are released not only by metamorphic rocks at high temperatures, but from magmas intruding the metamorphic rocks as well.
During mountain building, the crust in many places is saturated with migrating fluids.
These accelerate some chemical reactions, and may stop others.
So the spectacular diversity of metamorphic rock is created by the numerous protoliths, the presence of fluid, and the wide range of temperatures and pressures possible within the Earth.
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Geology School Keywords
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