Sp10_04 - Igneous Rocks mobot.org 4/20/11 geokem.com The...

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4/20/11 Igneous Rocks geokem.com mobot.org
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4/20/11 Igneou s Sediment ary Metamorp hic Melting Weathering Heat & Pressur e Melting Heat & Pressure The Rock Cycle
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Click to edit Master subtitle style 4/20/11 Igneous Rocks form from cooled molten matter Magma – molten rock inside Earth Lava – molten rock at Earth’s surface Magma Lava
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4/20/11 Magma forms intrusive igneous rocks Lava forms extrusive igneous rocks Volcanic Pluton
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4/20/11 Melting Rock Decompression Melting vs. Volatiles vs. Conduction
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4/20/11 Classifying Igneous Rocks Classified by texture and mineral composition Texture : Size, shape and arrangement of crystal grains Pitt.edu Pitt.edu texture mainly influenced by the rate of cooling Intrusive = Slow = large crystals Extrusive = Fast = small crystals
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4/20/11 Igneous Textures Aphanitic – small, fine grained crystals Extrusive – fast cooling Minerals too small to be seen
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4/20/11 Igneous Textures Phaneritic – large, coarse grained crystals
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This note was uploaded on 04/19/2011 for the course EES 2001 taught by Professor Thornburg during the Spring '11 term at Temple.

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Sp10_04 - Igneous Rocks mobot.org 4/20/11 geokem.com The...

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