Igneousrocks - Igneous Rocks Igneous Classification of...

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Igneous Rocks Igneous Rocks
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Classification of Rocks Classification of Rocks IGNEOUS SEDIMENTARY METAMORPHIC
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Igneous Rocks Igneous Rocks Solidified molten rock 1,100°C to 650°C Depends on composition Earth - mostly igneous rock Magma – Subsurface melt Lava – Melt at the surface Magma erupts via volcanoes
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Fig. 6.02 Fig. 6.02 W. W. Norton Plutonic intrusive Volcanic extrusive
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Igneous Rocks Igneous Rocks Formed by crystallization - cooling and consolidation of magma. 1) plutonic rocks — form below surface in crust. a) coarse crystals visible to eye.
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Igneous Rocks Igneous Rocks 2) Volcanic : crystallized on Earth’s surface a) Small (fine) crystals invisible to eye unless magnified.
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Magma Magma Molten rock beneath Earth’s surface hot: 600 - 1200° C contains Si, O, Na, Fe, Ca, K, Al, Mg (elements forming silicate minerals) volatiles: H 2 O, CO 2 , etc. crust and upper mantle
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Partial melting in crust / upper mantle. Melting is from… Pressure release Volatile addition Heat transfer Magma Formation Magma Formation
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Texture of Igneous Rocks Texture of Igneous Rocks Size of mineral crystal Related to depth of crystallization and cooling rate.
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Extrusive igneous rocks form  when magma erupts at the surface. The resulting rock is  fine-grained or has a  glassy texture.
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Igneousrocks - Igneous Rocks Igneous Classification of...

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