111-pp9 - UNIVERSITY OF SOUTH ALABAMA Last Time GY 111:...

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1 GY 111: Physical Geology GY 111: Physical Geology UNIVERSITY OF SOUTH ALABAMA Lecture 9: Extrusive Igneous Rocks Lecture 9: Extrusive Igneous Rocks Last Time 1) The chemical composition of the crust 2) Crystallization of molten rock 3) Bowen's Reaction Series 3.3 1.5 All other elements 1.4 2.1 Magnesium 1.8 2.6 Potassium 2.5 2.8 Sodium 1.9 3.6 Calcium 1.9 5.0 Iron 6.2 8.1 Aluminum 20.5 27.7 Silicon 60.5 46.6 Oxygen % of atoms Wt% Element Chemical Composition of the Crust Source http://www.ltcconline.net/julian Bowen’s Reaction Series Igneous Rock Composition high (>65%) Orthoclase, quartz, muscovite, biotite Medium-low Felsic moderate Na-Plagioclase, amphibole, biotite Medium Intermediate low Olivine, pyroxene, Ca-plagioclase High Mafic Very low (<45%) Olivine, pyroxene Very high Ultramafic Silica content Dominant Minerals Formation Temperature Composition Source: http://hyperphysics.phy-astr.gsu.edu Pause Igneous Rock Texture
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2 Today’s Agenda 1) Pyro-what? (air fall volcanic rocks)
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This note was uploaded on 02/04/2012 for the course GLY 111 taught by Professor Haywick during the Fall '11 term at S. Alabama.

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111-pp9 - UNIVERSITY OF SOUTH ALABAMA Last Time GY 111:...

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