6_Weathering[1]

6_Weathering[1] - 7 hydrolysis 8 oxidation 9 Differential...

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1 Weathering the rock cycle
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2 Weathering • Physical and chemical breakdown of rock – Mechanical (frost wedging, thermal expansion expansion) – Chemical (hydrolysis, oxidation) • Erosion involves transport • Weathering can also occur in place (e.g., soil formation, laterite, saprolite)
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3 mechanical weathering frost wedging
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4 change in reactive surface area?? mechanical weathering pressure release sheet joints exfoliation dome
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5 thermal expansion Joints Rocks broken along joints
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6 mechanical weathering (organisms) chemical weathering (reactions) • Water, oxygen, and carbon dioxide are main players • Can have complete dissolution (e.g., NaCl) but many minerals are insoluble in water unless acid is added unless –CO 2 in water = carbonic acid; causes pH to drop – organisms release acids • Hydrolysis (water split, incorporated in mineral structure) • Oxidation (electron transfer; oxygen is electron acceptor) Dissolution
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Unformatted text preview: 7 hydrolysis 8 oxidation 9 Differential weathering and erosion 10 Soil Formation Soil = weathered rock (45%), organic matter/humus, air, water Residual = formed in place Transported Typical soil profile (O A B C Horizons Typical soil profile (O, A, B, C Horizons) Soil types dep. on parent rock BUT different soil types can result from same parent rock; climate is the impt factor 11 Compositional Change from Chemical Weathering ID this rock? Weathering Rind SiO2 (wt %) 46.8 20.4 Al2O3 14 7 31 5 14.7 31.5 FeO 10.6 35.0 MgO 15.0 4.0 CaO 10.2 0.6 Na2O + K2O 1.7 0.8 99.2 92.3 igneous 12 Rank the following minerals in order of stability from slow weathering (most stable) to fast weathering (least stable): quartz, halite, pyroxene, calcite, olivine, mica, iron oxide, aluminum hydroxides, clays...
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This note was uploaded on 05/15/2008 for the course GEOL 101 taught by Professor Kendall during the Spring '07 term at Clemson.

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6_Weathering[1] - 7 hydrolysis 8 oxidation 9 Differential...

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