Chapter4_Igneous Rocks & Textures

Chapter4_Igneous Rocks & Textures - Igneous Rocks and...

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Unformatted text preview: Igneous Rocks and Textures Chapter 4 Born from Molten Magma Rock Types Igneous Rocks formed from the solidification of a molten liquid when it cools Sedimentary Rocks formed from consolidated sediments, cementation, or precipitated from solutions Metamorphic Rocks sedimentary or igneous rocks changed by heat, pressure, or impact The key factors in determining rock type is texture and composition. Igneous Rocks Igneous is derived from the Latin term ignis meaning fire. Igneous rocks are formed from the solidification and crystallization of a cooling magma. This is a exothermic (cooling) process from liquid to solid-state. Igneous rocks characteristics are controlled by: Rate of cooling; Magma geochemistry (controls mineralology); and Texture (size, shape, and arrangement of mineral grains). Types of Igneous Rocks Intrusive solidification of a magma within the earths crust: Magma derived Cools slowly and forms visible crystals (phaneritic crystals) Can have medium to course-grained crystals Granite is the most common intrusive igneous rock Extrusive solidification of magma (lava) on the earths surface: Cools rapidly and generally forms fine-grained indistinguishable crystals (aphanitic) Basalt is the most common extrusive igneous rock The Rock Cycle...
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This note was uploaded on 04/28/2008 for the course CIVIL CE 200 taught by Professor Unknown during the Fall '07 term at University of Alabama at Birmingham.

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Chapter4_Igneous Rocks & Textures - Igneous Rocks and...

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