EES-1000 Lecture Notes - Lecture 23: Desert Varnish, Spheroidal Weathering, Silicic Acid
21 Oct 2016
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Chemical weathering: occurs when minerals react with air and water, hydration (h2o), addition of co2, oxidation (o2)! Carbonic acid is formed from co2, that we have in our air, that gets dissolved in water so co2+h2o=h2co3: arkose- indicates physical weathering> chemical weathering! Oxidation:: reaction requires water, feric iron (aka rust) is insoluble! Desert varnish: dark brown coating on desert rocks that consists of clay + fe-oxides! Ex: indian drawings on rocks! (stability of minerals and rate of weathering table on moodle)! Soils: residues of weathering: losses:, leaching, minerals may move through the soil, additions, organic matter and minerals from bedrock ( ex: fsp to clay), other minerals precipitate from uids! You need to know! that it starts with ! organic and ends w/! bedrock and you ! need to know the ! letter order. Laterite-: soils rich in fe and al!
