111-pp26 - UNIVERSITY OF SOUTH ALABAMA Last Time...

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1 GY 111: Physical Geology GY 111: Physical Geology UNIVERSITY OF SOUTH ALABAMA Lecture 26 Regional Metamorphism Last Time… Metamorphism 1 A) Agents of Metamorphism B) Types of metamorphism C) Hydrothermal fluids (webnotes only) Metamorphism Metamorphism: a solid state change (recrystallization) of a parent rock by physical “agents” using operating deep within the interior of the Earth. Shale (Parent Rock) Slate (Metamorphic Rock) Metamorphism Agents of Metamorphism 1. Heat (25˚C to 800˚C; up to the point of melting) 2. Pressure (1 bar to 12 kbars) 3. Chemically active fluids (AKA hot water) ht p:/ news-service.stanford.edu/news/2005 Types of Metamorphism z Regional (heat and pressure) Associated with convergent plate boundaries ht p:/ www.indiana.edu/~geol105/images/gaia_chapter_5/regmeta.jpg Types of Metamorphism z Contact (heat only) Metamorphic aureoles Metamorphic aureole
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2 Types of Metamorphism z Cataclastic (pressure only) Mylonites Shear zones ht p:/ www.cliffshade.com/colorado/homestake/hsz01.jpg
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This note was uploaded on 02/04/2012 for the course GLY 111 taught by Professor Haywick during the Fall '11 term at S. Alabama.

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111-pp26 - UNIVERSITY OF SOUTH ALABAMA Last Time...

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