Ch12(07)- lecture

Ch12(07)- lecture - Chapter 12 Volcanism Assignment this...

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Chapter 12 Volcanism Assignment this week: read chapter 12
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Outline I. Products of volcanism A. Gases B. Liquids 1. Basaltic lava 2. Andesitic lava 3. Rhyolitic lava C. Solids II. Major forms of eruption A. Central eruption 1. Shield volcano 2. Volcanic dome
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3. Cinder cone 4. Composite volcano (stratovolcano) 5. Caldera 6. Diatreme B. Fissure eruption III. Global pattern of volcanism A. Divergent boundary B. Convergent boundary C. Mid-plate - hot spots
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Volcanism The process by which magma rises through the crust, emerges onto Earth’s surface as lava and cools to form volcanic rock. Volcanic plumbing system- volcanism transports magma from the interior and inject gases to the atmosphere
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Products of volcanic eruption A. Volcanic gases- degassing of Earth’s interior The main constituent is water vapor Other volcanic gases are CO2, SO2, N2,H2, CO, and Cl2 Volcanic gases gave us the oceans and the atmosphere They may also affect today’s climate
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B. Liquid - 3 kinds of lava 1. Basaltic Lava (mafic) 1. Low silica, high temperature (1000-1200 degrees Celsius), low viscosity 2. Example: pillow basalt, aa, pahoehoe 2. Andesitic lava (intermediate) 3. Rhyolitic lava (felsic) 1. High silica, low temperature (800 degrees Celsius), thick and viscous
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Two types of basaltic lava (Hawaii) aa and pahoehoe.
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Pillow basalts from underwater on mid- ocean ridges
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C. Solids- pyroclastics
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This note was uploaded on 05/04/2008 for the course GEOL 1001 taught by Professor Baksi during the Fall '07 term at LSU.

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Ch12(07)- lecture - Chapter 12 Volcanism Assignment this...

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