Chapter 6_Metamorphic Rocks & Textures1

Chapter 6_Metamorphic Rocks & Textures1 - Metamorphic...

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Metamorphic Rocks Chapter 6
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Metamorphic Rocks Metamorphic rocks form from preexisting rocks subjected to heat and pressure that changes the original (parent rock) into a completely new rock. The word "metamorphic" comes from Greek and means "To Change Form". The parent rock can be either sedimentary, igneous, or even another metamorphic rock. Metamorphic rocks significantly different textures compared to igneous and sedimentary rocks. Limestone can be changed to marble, sandstone can be changed into quartzite, and shale can be changed to slate.
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Metamorphic Processes Metamorphism of rocks is driven by changes in: Pressure - the weight of overlying rocks Stress - plates colliding from the formation of mountains Impact – meteors Temperature - contact with hot geothermal fluids Chemically - contact with reactive fluids
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Types of Metamorphism Dynamic Metamorphism - Pressure along fault zones causes the crushing and ductile flow of rock. Impact Metamorphism - Occurs associated with the impact of extraterrestrial features with the earth. Contact Metamorphism - Associated with the contact with a heat source such as magma (igneous intrusions that form plutons). Regional Metamorphism - Associated with large geologic processes such as mountain-building or plate tectonics (convergent plate boundaries and continental collision). Also included the response of pressure increase with depth due to the weight of the overlying rocks.
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This note was uploaded on 04/28/2008 for the course CE 200 taught by Professor Unknown during the Fall '07 term at University of Alabama at Birmingham.

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Chapter 6_Metamorphic Rocks & Textures1 - Metamorphic...

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