Science Fair Project Encyclopedia
Migmatite
Migmatite is a rock in the frontier between igneous and metamorphic rocks. They form on extreme temperature-pressure conditions, where partial melting occurs in pre-existing rocks. On one hand migmatites are not crystallized from a totally molten material, on the other are not the result of solid state reactions as metamorphic rocks. Migmatites are composed of a neossome, new material crystallized from incipient melting, and a paleossome, old material that resisted melting. Commonly, migmatites are extremely deformed rocks that represent the base of eroded, old mountain chains.
See also: igneous rocks, metamorphic rocks, list of rocks
09-23-2007 01:00:40
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details