sp10_2b_106_Volc2

sp10_2b_106_Volc2 - Volcanic Eruptions Where not to be when...

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Unformatted text preview: Volcanic Eruptions Where not to be when the volcano blows Review: What Variables Control Melting? 1. Temperature *Increase Temp 2. Composition (Melting Temperature) Mafic higher temp than Felsic 3. Pressure *Decrease Pressure 4. Water Content *Increase Water *Causes melting Properties of Silicate Magma Mafic Felsic 1. Composition Low Silica (Mg,Fe,Ca) High Silica (Al, K, Na) 2. Temperature High (1200C) Low (800C) 3. Viscosity Low High 4. Gas Content Low High 5. Formation (Partial) Melting of the Mantle (Partial) Melting of the Crust Where Does Magma Form? In other words - where do these conditions exist? 1. Divergent Plate Boundaries 2. Hot Spots (Due to Decrease Pressure Mafic Magma ) 3. Subduction Plate Boundaries (Due to Increased Water Content Intermediate/Felsic Magma ) Magma Rises and Cools Magma Chamber Surface Intrusive (Plutonic) Extrusive (Volcanic) Volcano Terminology Magma Chamber Volcanic Conduit Crater/ Vent Ash Plume Volcanic Cone Eruption (Ash) Column Volcanic Classification...
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This note was uploaded on 01/11/2012 for the course GEO 106 taught by Professor Robviens during the Spring '10 term at Bellevue College.

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sp10_2b_106_Volc2 - Volcanic Eruptions Where not to be when...

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