Geol111_Igneous Rocks 2007

Geol111_Igneous Rocks 2007 - Igneous Rocks "The beer I...

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Igneous Rocks
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“The beer I had for breakfast wasn’t bad so I had one more for desert.” - Sunday Morning Coming Down by Kris Kristofferson
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What is a rock ? [Yes, you really do care.]
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General characteristics of magma Igneous rocks form as molten rock cools and solidifies g General characteristics of magma g Parent material of igneous rocks g Forms from partial melting of rocks g Magma at surface is called lava
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General characteristics of magma General characteristic of magma g Rocks formed from lava = extrusive, or volcanic rocks g Rocks formed from magma at depth = intrusive, or plutonic rocks
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General characteristics of magma The nature of magma g Consists of three components: g Liquid portion = melt g Solids, if any, are silicate minerals g Volatiles = dissolved gases in the melt, including water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2)
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Igneous textures Texture - the size, shape, and arrangement of interlocking minerals g Factors affecting crystal size g Rate of cooling g Slow rate = fewer but larger crystals g Fast rate = many small crystals g Very fast rate forms glass
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Igneous textures Types of igneous textures
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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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Geol111_Igneous Rocks 2007 - Igneous Rocks "The beer I...

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