L4_ExIgRcks

L4_ExIgRcks - READ CHAPTER 5 Weathering and Soil This...

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Unformatted text preview: READ CHAPTER 5 Weathering and Soil This material will be on the first test. Pay Close Attention To: Mechanical vs. Chemical Weathering Processes - Pressure Release, Frost Action, Oxidation, Solution Weathering 5 factors of Soil Formation Parent Material, Slope, Biota, Climate, Time Temperature Minerals melt at different temps Geothermal Gradient (2.5 C/100 km) SOURCE: http://www.geol.umd.edu/~jmerck/geol100/lectures/10.html COMPLICATIONS CASE 1: Decompression Melting SOURCE: http://www.geol.umd.edu/~jmerck/geol100/lectures/10.html COMPLICATIONS CASE 2: Water Other Volatiles SOURCE: http://www.geol.umd.edu/~jmerck/geol100/lectures/10.html Location of Formation MOR, Mantle Plumes, Subduction Zones SOURCE: http://www.geol.umd.edu/~jmerck/geol100/lectures/10.html Crystallization Differentiation Partial-Melting Assimilation Mixing of Magma Composition and Texture Composition is ALL ABOUT THE SILICA Ultramafic: less than 45% Mafic: approx. 50% silica Intermediate: between 50% and 65% Felsic: 65% or more silica Composition and Texture Texture is related to how it cools Aphanitic: sugar cookie Porphyritic: chocolate chip cookie Phaneritic: oatmeal raisin cookie Glassy, vesicular, pegmatite...
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L4_ExIgRcks - READ CHAPTER 5 Weathering and Soil This...

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