Ch3-part 2

Ch3-part 2 - of sediments 1. Clastic sediments- Particles...

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Chapter 3 - Part II Rock Classification And Rock Cycle Read pp. 62 - 69, 73-75
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Outline I. Classification of rocks A. Igneous rocks Intrusive - plutonic rocks Extrusive - volcanic rocks B. Sedimentary rocks Clastic sediments Chemical and biochemical sediments C. Metamorphic rocks II. Rock cycle
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Rocks are natural aggregate of minerals. For example, granite is made of several minerals.
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Fig. 3.22 Three major rock groups
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Intrusive and Extrusive Igneous Rocks
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A. Igneous rocks – form by crystallization from a magma (molten rock) (ignis- fire) 1. Intrusive igneous rocks (plutonic rocks) Forms by crystallization of magma that intrudes into Earth’s crust Cool slowly Mineral grains are coarse Example: Granite
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2. Extrusive rocks (volcanic rocks) Forms when magma erupts at Earth’s surface Rapid cooling Mineral grains are fine Example: Basalt
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B. Sedimentary rocks Weathering Sediment Erosion Transportati on Deposition Lithification
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Sedimentary rocks form from two kinds
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Unformatted text preview: of sediments 1. Clastic sediments- Particles from decomposition of rocks (sand, silt, clay particles) 2. Chemical and biochemical sediments Chemical precipitated from seawater (gypsum, halite) Shells of organisms (calcite) C. Metamorphic rocks Form from transformation of pre-existing rocks under high temperature and pressure Meta= change, morph= form Rocks can change its mineral composition, chemical composition, and texture due to high temperature and pressure Metamorphic rocks can form from igneous, sedimentary, and metamorphic rocks. Metamorphism in plate tectonic settings Regional metamorphism occurs under high temperature and pressure over a large region where plates collide. Contact metamorphism occurs at the contact with an intrusion. Rock cycle: Each of the three kinds of rocks can be transformed to the other two. Rock cycle in a plate tectonic framework...
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This note was uploaded on 05/04/2008 for the course GEOL 1001 taught by Professor Baksi during the Fall '07 term at LSU.

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Ch3-part 2 - of sediments 1. Clastic sediments- Particles...

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