METAMORPHIC ROCKS abbrev

METAMORPHIC ROCKS abbrev - – Shale => Slate –...

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Metamorphism and Metamorphic Rocks 1. Metamorphism is a subsurface process occurs at depths greater than several kms 1. Requires high T and P both T and P increase with increasing depth 2. Results in textural changes due to new crystal formation foliation : layering of crystals; common feature of metamorphic rocks
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Metamorphic Facies
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Increase in Pressure with Depth
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Foliation
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Foliation
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Foliation
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Foliation Processes
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Grades of Metamorphism
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Fine grained; low grade metamorphism
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Schist Elongated mineral grains; some foliation
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High grade metamorphism; layering of light and dark minerals (foliation)
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Metamorphosed limestone
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Types of Metamorphism 1. Shock Metamorphism - impact of extraterrestrial body (meteorite) 2. Contact Metamorphism - thermal metamorphism; local or small scale 3. Regional Metamorphism - high pressure; broad scale; often associated with mountain buildiing
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Shock Metamorphism
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Lunar Craters
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Types of Metamorphism Contact Metamorphism (thermal metamorphism; temperature is key factor; pressure is secondary) Narrow zone of contact
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Unformatted text preview: – Shale => Slate – Limestone => Marble – Sandstone => Quartzite Metamorphic Facies Contact Metamorphism Contact Metamorphism Gneiss Schist Shale Slate Limestone - Marble Types of Metamorphism • Regional Metamorphism – Takes place at considerable depth where T and P are high – Common in regions of mountain building – Basalt => schist => amphibole – Rhyolite => schist => gneiss Regional Metamorphism Deformation of bedding 3.7 billion years old Metamorphism and Plate Tectonics Foliation of Metamorphic Rock Lakes in arid regions in which evaporites are deposited are referred to as a. alluvial fans b. playas c. fluvial basins The large rock fragments in breccias a. have undergone significant long term erosion b. are recently weathered c. are typical of a low energy environment The End The most common biologically produced non-clastic sedimentary rock is a. gypsum b. pyrite c. limestone Black Smoker Hydrothermal Systems Rock Cycle...
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This note was uploaded on 06/06/2011 for the course GEOL 101 taught by Professor Knapp during the Spring '08 term at South Carolina.

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METAMORPHIC ROCKS abbrev - – Shale => Slate –...

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