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Lecture 11

Lecture 11 - Metamorphic Rocks

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Earth Sciences
Earth Sciences 1083F/G
Cameron Tsujita

Lecture 11Metamorphic Rocks y Metamorphic Rocks formed by the transformation of preexisting rocks under the influence of high temperatures and pressures and chemically active fluids y 3 types of metamorphism o Contact o Regional o Metasomatism y Contact Metamorphism o Occurs when a preexisting rock is cooked under relatively low pressures o Commonly occurs when rock is heated by igneous intrusion forming a metamorphic halo or aureole in the adjacent rockgenerally local in extent o Mineral organization is random y Regional Metamorphism o Occurs when a preexisting rock is subjected to heat and pressure on a large scale o Commonly associated with mountain building o Foliation platyelongate minerals line up to produce a foliated texture foliumleaf y Common Metamorphic Rocks o Some metamorph
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