Geol 101 Metamorphic Rocks

Geol 101 Metamorphic Rocks - Geol 101 Metamorphic Rocks...

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Geol 101 Metamorphic Rocks 09/10/2007 12:42:00  Temperature increases with depth o geothermal gradient (20-30 degrees c/km) Nearby igneous intrusion Fig 2.7 What is Metamorphism? Change in form (composition and texture) o Heat  o Pressure  o Chemical Fluids Why? o Rocks adjust to become more stable Metamorphism does NOT occur by melting!!! Pressure Burial Plate Motion You can create enough pressure with piling sediment on top of sediment and  creates depression Burial Metamorphism As sediment accumulates, the first-deposited layers are buried deeper into  Earth, raising the temperature of the rocks Have to get to a certain depth to start metamorphism  Fig 6.3 Temperature and Pressure Low-Grade Metamorphism  o 100-350 degrees Celsius and low pressure High-Grade Metamorphism
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o Greater than 600 degrees Celsius and High pressure
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This note was uploaded on 04/28/2008 for the course GEOL 101 taught by Professor Olinsky during the Fall '08 term at Texas A&M.

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Geol 101 Metamorphic Rocks - Geol 101 Metamorphic Rocks...

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