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111-pp10 - UNIVERSITY OF SOUTH ALABAMA Quiz Five(9:30-9:35...

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1 Quiz Five (9:30-9:35 AM) GY 111: Physical Geology GY 111: Physical Geology UNIVERSITY OF SOUTH ALABAMA Lecture 10: Intrusive Igneous Rocks Lecture 10: Intrusive Igneous Rocks Last Time 1) Pyro-what? (air fall volcanic rocks) 2) Felsic and Intermediate Extrusive Rocks 3) Mafic Extrusive Rocks Pyroclastic Igneous Rocks Volcanic ash Pumice Other “pyroclastic” rocks Tuff Rhyolite Volcanic Bombs Chalk board Felsic/Intermediate Extrusive Igneous Rocks Felsic and intermediate rocks are classified by the amount of SiO 2 in their bulk chemistry. We can distinguish them on the basis of mineral composition and color. Mt. St. Helens Lava dome Rhyolite Andesite
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2 Mafic Extrusive Igneous Rocks Mafic extrusive igneous rocks have relatively low SiO 2 contents in their bulk chemistry. No ultramafic extrusive igneous rocks occur today. Basalt Insert photo of scoria Today’s Agenda 1) Intrusive igneous rocks and the bodies they form 2) Summary diagram of all igneous rock types 3) Igneous rocks that suck Web notes 10
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