4-Igneous rocks - Igneous Rocks (Chapter 4) Click to edit...

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Click to edit Master subtitle style 3/1/11 Igneous Rocks (Chapter 4)
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3/1/11 The rock cycle Uta h Scotla nd New Mexico
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3/1/11 - Igneous rocks form by crystallization from a magma (molten rock). - Two types of igneous rocks: 1) Intrusive (plutonic) : Crystallize beneath the Earth’s surface. Cooled slowly. Large crystals (coarse-grained). 2) Extrusive (volcanic): Crystallize at the Earth’s Igneous Rocks Intrusive rocks Extrusive rocks n
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3/1/11 We classify igneous rocks by texture and composition .
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3/1/11 Texture Primarily determined by cooling
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3/1/11 Intrusive rocks Pyroclasts Extrusive rocks Volcanic ash Extrusive igneous  rocks cool rapidly and  are fine-grained. Intrusive igneous rocks  cool slowly, allowing  large, coarse crystals  to  form. Some intrusive  porphyritic crystals  grow large, but the remaining melt cools  faster, forming smaller  crystals.
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3/1/11 Intrusive (Coarse- grained)
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3/1/11 Extrusive (fine-grained) ) Extrusive rocks form from lava (molten rock that extrudes onto the surface of the earth). 1100 °C
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3/1/11 Pyroclastic Materia l Result from explosive volcanic ejecta, typically travel through air. Obsidi an As h Pumi ce Bom bs
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3/1/11 Tuff Lithified volcanic ash.
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3/1/11 Porphyry p Two stages of cooling. 1- Slow cooling. 2- Rapid cooling. phenocrysts
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3/1/11 Composition Extrusi ve Intrusiv e Mafic- Low Si (darker) Felsic- High Si (lighter)
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3/1/11 viscosity crust mantle
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3/1/11 Felsic Intrusive Granite Rich in Si (~70%) Poor in Fe and Mg, Quartz, K-feldspar, Na- plagioclase
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3/1/11 Felsic Extrusive Rhyolite Rich in Si (~70%) Poor in Fe and Mg, Quartz, K-feldspar, Na-
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4-Igneous rocks - Igneous Rocks (Chapter 4) Click to edit...

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