Lecture 11 - Rocks Weathering

Lecture 11 - Rocks Weathering - Rocks Continued Olivine...

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Rocks Continued
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Olivine Video
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Metamorphic Rocks "Changed form" rocks Produced from preexisting Igneous rocks Sedimentary rocks Other metamorphic rocks
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Metamorphic Rocks Metamorphism Takes place where preexisting rock is subjected to temperatures and pressures unlike those in which it formed Degrees of metamorphism Exhibited by rock texture and mineralogy Low-grade (e.g., shale becomes slate) High-grade (obliteration of original features)
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Metamorphic Rocks Metamorphic settings Contact, or thermal, metamorphism Occurs near a body of magma Changes are driven by a rise in temperature Regional metamorphism Directed pressures and high temperatures during mountain building Produces the greatest volume of metamorphic rock
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Metamorphic rocks Metamorphic agents Heat Pressure (stress) From burial (confining pressure) From differential stress during mountain building Chemically active fluids Mainly water and other volatiles Promote recrystallization by enhancing ion migration
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Metamorphism and Pressure
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Metamorphic Rock Textures Foliated texture Minerals are in a parallel alignment Minerals are perpendicular to the compressional force Nonfoliated texture Contain equidimensional crystals Resembles a coarse-grained igneous rock
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Development of Foliation
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Common Metamorphic Rocks Foliated rocks Slate Fine-grained, splits easily Schist Strongly foliated (“platy”) Types based on composition (e.g., mica schist) Gneiss Strong segregation of silicate minerals "Banded" texture
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Nice Gneiss Video
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Common Metamorphic Rocks Nonfoliated rocks Marble Parent rock is limestone Large, interlocking calcite crystals Quartzite Parent rock – quartz sandstone Quartz grains are fused
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Metamorphic Grade
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Resources from Rocks and Minerals Metallic mineral resources Gold, silver, copper, mercury, lead, etc. Concentrations of desirable materials are produced by Igneous processes Metamorphic processes
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Resources from Rocks and Minerals Nonmetallic mineral resources Make use of the material’s Nonmetallic elements
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This note was uploaded on 01/26/2012 for the course EAS 2600 taught by Professor Ingalls during the Fall '08 term at Georgia Institute of Technology.

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Lecture 11 - Rocks Weathering - Rocks Continued Olivine...

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