Igneous_Lectures3&4 - Today: Mineral (Ch. 3); Igneous Rocks...

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Unformatted text preview: Today: Mineral (Ch. 3); Igneous Rocks (Ch. 5) Next Time: Igneous Rocks (Ch. 5) • The Rock Cycle • Melting Rock • Solidifying Magma • Composition of Magma- mafic vs felsic- igneous differentiation • Extrusive Igneous Rocks- eruptive style- volcanic landforms • Intrusive Igneous Rocks- types of intrusions • Why Should We Care? Igneous Rocks The Rock Cycle 3 Types of Rocks Each rock type can be transformed into another rock type. 1) Igneous Rocks 2) Sedimentary Rocks 3) Metamorphic Rocks The Rock Cycle (Figure 4-1) igneous rocks : produced when melted rock solidifies… “Born of Fire” • The Rock Cycle • Melting Rock • Solidifying Magma • Composition of Magma- mafic vs felsic- igneous differentiation • Extrusive Igneous Rocks- eruptive style- volcanic landforms • Intrusive Igneous Rocks- types of intrusions • Why Should We Care? Igneous Rocks Melting Rock magma : melted rock below surface (crystals + melted rock + dissolved water) lava : magma erupted at the earth’s surface vs Where does the magma that feeds volcanoes come from? (A) isolated chambers of magma in the crust and mantle; (B) a universal pool of magma in the completely molten mantle; (C) the liquid core of the earth; (D) all of the above. Question Melting Rock Melting Rock • Where: at great depths in the earth’s crust • How: 1) increase temperature 2) decrease pressure 3) add water Melting Rock increase temperature decrease pressure add water (See Figure 5-20) Today: Igneous Rocks (Ch. 5) Next Time: Sedimentary (Ch. 7) • The Rock Cycle • Melting Rock • Solidifying Magma • Composition of Magma- mafic vs felsic- igneous differentiation • Extrusive Igneous Rocks- eruptive style- volcanic landforms • Intrusive Igneous Rocks- types of intrusions • Why Should We Care?...
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This note was uploaded on 10/02/2008 for the course GEO 303 taught by Professor Leon during the Spring '08 term at University of Texas at Austin.

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Igneous_Lectures3&4 - Today: Mineral (Ch. 3); Igneous Rocks...

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