Metamorphism - a Differential stress i Shear stress 4 Time...

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Metamorphism The old (original) rock is the parent rock The new rock is a metamorphic rock Metamorphic rock characteristics What controls the features of metamorphic rock? 1. Composition of parent rock a. The mineral content is controlled by what is the parent rock 2. Temperature and pressure during metamorphism a. Temperature (heat) b. Pressure (stress) i. From burial (confining pressure) ii. From differential stress during mountain building iii. Pressure acts the same in all directions iv. 3.3 km (2 miles) under rock = 1000 atmospheres of pressure c. Chemically active fluids i. Mainly water and other volatiles ii. Promote recrystallization by enhancing ion migration 3. Tectonic forces (stress on rock)
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Unformatted text preview: a. Differential stress i. Shear stress 4. Time a. Tough to build metamorphic rocks in the laboratory as they grow very slowly in nature Classification of metamorphic rocks Both metamorphic environment and parent rock determine rock classification Types of metamorphism Two most common types: 1. Contact metamorphism a. Has temperature as the dominant factor b. Like making ceramics – heat but no pressure 2. Regional metamorphism a. Usually occurs deep below the earth’s surface (at least 5 km), so pressure can be high b. Rock is usually foliated, indicating differential stress c. Produces the greatest volume of metamorphic rock...
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This note was uploaded on 04/09/2008 for the course GEOL 1030 taught by Professor Abolins during the Fall '08 term at Middle Tennessee State University.

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