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T10+Slides - O O Gibbsite General Weathering Pathway of...

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1 Clay Mineralogy Important Properties of Clays Size: <2 micron (<0.002 mm) Surface area 10 to >800 m 2 /g responsible for matric potential Surface charge retain cations and anions Loam: a textural class in which the sand, silt and clay fractions have a similar influence on soil properties. H O Si Al Silicon tetrahedron Aluminum Octahedron O Building Blocks for Clay Minerals Silicon Tetrahedral Sheet Aluminum Octahedral Sheet
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2 1:1 Layer Silicate Clay Hydrogen Bonding OH O 2:1 Layer Silicate Clay No Hydrogen Bonding
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Unformatted text preview: O O Gibbsite General Weathering Pathway of Clay Minerals Oxides/Hydroxide 1:1 Layer Silicates 2:1 Layer Silicates Oxides/Hydroxide 1:1 Layer Silicates 2:1 Layer Silicates Primary Minerals (except quartz) Highest Stability Lowest Stability 3 Incongruent Weathering K-feldspar + HOH H-feldspar + K + + OH-(1:1 layer silicate) Incongruent Weathering Precipitation from Soil Solution Ca 2+ + CO 3 2- CaCO 3 Fe 3+ + H 2 O Fe 2 O 3 2:1 Layer Silicates 2:1 Layer Silicates Shrink - Swell...
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T10+Slides - O O Gibbsite General Weathering Pathway of...

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