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USGS CMG InfoBank: Composition

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Comment: 11:12 - 12:11 (00:59)
Source: Annenberg/CPB Resources - Earth Revealed - 18. Metamorphic Rocks
Keywords: "John Rosenfeld", "metamorphic rock", geologist, composition, metamorphism, water, temperature, "carbon dioxide"

Our transcription: Yet another factor may be critical in creating metamorphic rocks.
For many years, geologists believed that the overall composition of a rock rarely changes during metamorphism; however, this is no longer assumed to be the case.
The other aspect of metamorphism the result of these metamorphic reactions is that the rocks undergo changes in composition.
And mainly this shows up in the formation of the liberation of H20 and its departure from the rocks, so the rocks dry out in very much the same way that a fired pot dehydrates in a kiln.
The main feature of higher temperatures, for example, is to cause the rock to undergo a loss of certain volatile components, and in most metamorphic rock that means mainly the loss of H20 and C02.

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