Geology 101 Volcanoes_2007

Geology 101 Volcanoes_2007 - S Idaho Beginnings of a...

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Igneous Systems: Volcanos
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Extrusive Rock Bodies Form of extrusive bodies influenced by magma properties Composition Silica content Viscosity Volatile content Temperature
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Basaltic Eruptions Low Silica + High T = Low Viscosity Produce Lava Flows - Pahoehoe or Aa Flood basalts Fissure eruptions Spatter cones Shield Volcanoes Pillow lavas
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Aa flow Pahoehoe flow
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Craters of the Moon Nat’l Monument
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Unformatted text preview: S. Idaho Beginnings of a spatter cone Large cinder cone Formation of pillow lavas Intermediate & Silicic Eruptions • Higher Silica + Lower T = Higher Viscosity • Produce – Composite & Stratovolcanos – Lava Domes – Ash Flow Calderas Formation of Volcanic Domes Process of formation of ash flow caldera- e.g., Crater Lake, OR Size comparison of various volcanic features...
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This note was uploaded on 10/26/2009 for the course GLY 123 taught by Professor Vogl during the Spring '09 term at University of Florida.

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Geology 101 Volcanoes_2007 - S Idaho Beginnings of a...

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