PLSC204 Lecture Notes - Lecture 4: Clay Minerals, Parent Material, Illuvium
19 Jan 2019
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Plsc204 notes - weathering & factors of soil. Physical weathering - breaking, grinding, disintegration of consolidated material into smaller particles. Wind , water , temp fluctuations, freezing h2o. Biogeochemical weathering - dissolution or chemical alteration of original material (usually most important) Products of weathering can be inherited (e. g. sediments) Igneous rocks can weather down to clay minerals, and those clay minerals can be eroded away and dropped down elsewhere and then development of new soil. Types of material based on mode of origin. Residual parent materials are an inorganic material formed in place. Other inorganic materials are based on how things are transported. If deposited by streams, alluvial (stratified, occurs adjacent to streams) Colluvial - can be a rock slide. With the execption of organic parent material, the above classification gives no indication of chemical composition. Accumulation of carbonates and soluble salts in lower horizons (dry climates) or their removal (wet climates, due to being soluable)
