Geol 101 Weathering and Soils

Geol 101 Weathering and Soils - Geol 101 Continued...

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Geol 101 Continued Weathering and Soils 23/10/2007 12:44:00 Oxidation Loss of electron(s) o Often color change o Fe-oxide (rust color) o Mn-Oxide (Black color) o Cu-Oxide (Green( Chemical Weathering of Iron Oxidation Hydration – Ferric hydroxide Dehydrate – Geothite Dehydrate – Hematite Combined Reactions Almost all instances of chemical weathering involve more than one reaction  pathway o Dissolution – hydrolysis – leaching o Some minerals (silica) left unaltered (very slow to weather) o It takes millions of years to weather 1mm crystal of quartz! Chemical Weathering A surface process - contact Works fastest on edges – creates round boulders Spheroidal Weathering
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Concentric shells of rock spall from the outside of an outcrop or a boulder  (exfoliations) Differential chemical weathering – density changes Chemical weathering promotes mechanical weathering Factors Influencing Weathering Mineralogy o Silicate minerals resist weathering
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Geol 101 Weathering and Soils - Geol 101 Continued...

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