Chapter+4a+-+Igneous+Rocks

Chapter4a igneousrocks

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Unformatted text preview: Grotzinger • Jordan Understanding Earth Sixth Edition Chapter 4: IGNEOUS ROCKS Solids from Melts © 2011 by W. H. Freeman and Company Chapter 4: Chapter Igneous Rocks: Solids from Melts Melts About Igneous Rocks About • Igneous rocks form from liquid rock Igneous (magma) in several different ways. (magma) • Igneous processes within the Earth Igneous produce intrusive igneous rocks. • Igneous processes on or near Earth’s Igneous surface produce extrusive igneous rocks. surface 1. How Do Igneous Rocks Differ from One Another? from Texture – size of crystals Coarse-grained rocks (phaneritic) Fine-grained rocks (aphanitic) Mixed texture rocks (pophryritic) 1. How Do Igneous Rocks Differ from One Another? from Clues about significance of texture Early studies of volcanic rocks Laboratory crystallization studies Studies of slow cooling in granite Pyroclasts Volcanic ash Extrusive rocks Bomb Pumice Mafic Basalt Felsic Rhyolite Gabbro Granite Porphyry Intrusive rocks Phenocrysts Porphyry Extrusive pyroclasts form in violent eruptions...
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This note was uploaded on 07/12/2011 for the course EAS 2600 taught by Professor Ingalls during the Summer '08 term at Georgia Institute of Technology.

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