MetRocks - Chapter 7 Metamorphic Rocks Metamorphism...

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Chapter 7 Metamorphic Rocks Metamorphism – literally “change form,” is the set of process in which a pre-existing rock undergoes changes from exposure to heat, pressure, and/or chemical fluids. Parent rock – the pre-existing rock that is metamorphosed. Can be igneous, sedimentary, or metamorphic. Three agents of metamorphism – heat, pressure, and chemically active fluids. Heat, from one of two sources Proximity to a magma body The geothermal gradient Pressure Confining pressure – same in all directions, found in deep earth from burial Differential stress (aka directed pressure) – comes from a specific direction. Usually tectonic in nature Chemically active fluids Usually have some relationship to magma. May be magmatic fluids (volatiles escaping from a pluton) May also be fluids that circulate close to magma body. In this case, magma heats fluids, fluids dissolve minerals Fluid with dissolved minerals is chemically active.
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This note was uploaded on 01/17/2012 for the course GEOL 1054 taught by Professor Dr.bethrinard during the Fall '09 term at Tarleton.

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MetRocks - Chapter 7 Metamorphic Rocks Metamorphism...

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