Lecture4 - Igneous rocks Sedimentary rocks Metamorphic...

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Igneous rocks
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Sedimentary rocks
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Metamorphic rocks
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lava
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magma
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Cooling Magma texture : sizes, shapes, and arrangement of mineral grains (crystals) What does texture tell us about cooling history?
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obsidian Volcanic glass- obsidian disorganized atomic structure Fig. 5-4
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Basalt Green mineral is OLIVINE Holes created by VOLATILES- escaping gases
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Basalt
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Silicate tetrahedron- (SiO 4 )4-
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Fig. 6.1
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Igneous Rock Classification (simplified) felsic mafic TEXTURE gabbro BASALT GRANITE large crystals (intrusive) rhyolite small crystals (extrusive) MINERAL COMPOSITION
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GABBRO-BASALT
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GRANITE-RHYOLITE
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pahoehoe lava Pahoehoe lava Smooth and ropy basalt
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Aa lava- rocky and blocky basalt
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Pillow lava- Basalt that Crystallizes Under water
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1. Shield volcano 2. Flood basalt 3. Stratovolcano 4. Cinder cone 5. Caldera
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1. Shield volcano
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This note was uploaded on 07/07/2010 for the course GEO geo taught by Professor Long during the Spring '10 term at University of Texas.

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Lecture4 - Igneous rocks Sedimentary rocks Metamorphic...

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