GEOL 104 Lecture Notes - Lecture 14: Calcite, Arkose, Plagioclase
18 Apr 2016
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Geol104 lecture 14 sedimentary rocks to diagenesis. The most influential control of soil formation. The soil profile: soil-forming processes operate from the surface downward. Soil is divided into horizontal layers called horizons. A vertical section through all the soil horizons is called a soil profile. A mature soil has a well-developed horizons. An immature soil may lack soil horizons: o soil layer. Organic and mineral matter: e layer. Thick masses of insoluble iron and aluminum oxides; occasional quartz. Quartz and clay minerals present: spodosol. Sedimentary rocks are an important resource: aridosol. Some iron and aluminum oxides precipitated: all soluble materials such as carbonates leached away. Calcium and carbonate pellets and nodules precipitated. The importance of sedimentary rocks: sediments and sedimentary rocks cover approx. 75% of earth: they comprise about 5% of earths outer ten miles, contain evidence of past environments: Resources: relative abundance of rocks at earths surface. Origins of sedimentary rock: are products of mechanical and chemical weathering.
