Lecture 9 Colloids I

Lecture 9 Colloids I - The Soil Solid Fraction 25% 25% 45%...

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Unformatted text preview: The Soil Solid Fraction 25% 25% 45% 5% Air Water Mineral Organic Solids Pores From where do mineral particles originate? Rocks and Minerals Limestone Calcite Sandstone Quartz Shale Clays Granite Quartz/Feldspars Basalt Quartz/Feldspars Rock Dominant Mineral Weathering Physical: changing the size and shape of Rocks or mineral particles without altering their chemical composition Chemical: altering a mineral particles chemical composition. Weathering Physical: freezing and thawing plants and biota wind, rain, abrasion Chemical: hydration hydrolysis oxidation/reduction acids dissolution Reduce Size } Chemical Alteration } Destruction and Synthesis Minerals: quartz, feldspars, biotite Granite Rocks breakdown (weather) by physical means Primary Minerals Primary minerals (e.g. quartz, feldspars) are dominated by Si, Al, O Primary minerals breakdown (weather) principally by chemical means Secondary Minerals Silicate clay minerals are dominated by Si, Al, O Silicate clays Iron oxides Aluminum oxides Quartz Si O 2 Feldspar K AlSi 3 O 8 Biotite KMg 3 AlSi 3 O 10 (OH) 2 Albite Na AlSi 3 O 8 Primary Minerals Aluminum and Silicon Quartz Si O 2 Feldspar K AlSi 3 O 8 Biotite KMg 3 AlSi 3 O 10 (OH) 2 Albite Na AlSi 3 O 8 Muscovite K Al Si O 10 (OH) 2 Chemical Alteration and Reorganization Primary Minerals Crystalline Aluminosilcate Clays Dominated by Aluminum, Silicon, Oxygen Chemical weathering Secondary Minerals Silicate Clays Silicate Clays Colloidal 1.Small (< 1 micron) 2.Large surface area 3.Highly reactive Constituents of Silicate Clays...
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This note was uploaded on 07/31/2011 for the course SOS 3022 taught by Professor Staff during the Fall '08 term at University of Florida.

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Lecture 9 Colloids I - The Soil Solid Fraction 25% 25% 45%...

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