Lecture 7 Feb 4 2008 Extrusive igneous rocks

Lecture 7 Feb 4 2008 Extrusive igneous rocks - Bowen’s...

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Bowen’s Reaction Series Bowen’s Reaction Series The order for partial melting is the inverse of the order for crystallization.
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Factors that influence melting Temperature Rocks of different composition have different melting temperatures. Felsic minerals melt at lower temperatures than mafic minerals. Pressure The higher pressure, the higher the temperature required to melt the same rock. Water content The presence of water vapor lowers the melting temperature. Water is common in sedimentary rocks and in oceanic crust drawn down into subduction zones.
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Andesite is an intermediate composition between viscous, silca-rich, light-colored rhyolite and fluid, iron-rich, dark-colored basalt. Type of tectonic setting determines the composition of the magma which in turn establishes the type of volcanic eruption and the type of extrusive igneous rock formed.
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Basalt (mafic, low-viscosity lava) Rhyolite (felsic, highly viscous lava) Extrusive rock types Andesite (intermediate, viscous lava)
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Convergent boundaries (plate subduction)
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Mt. Rainier, Cascade Range, Washington
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This note was uploaded on 04/11/2008 for the course EVSC 280 taught by Professor Herman during the Spring '08 term at UVA.

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Lecture 7 Feb 4 2008 Extrusive igneous rocks - Bowen’s...

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