Earth Sciences 1022A/B Lecture Notes - Lecture 6: Lithification, Weathering, Soil Horizon
27 Apr 2019
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Document Summary
Weathering and erosion break down rocks (all rock types!) which generates or produces sediment. Transportation of sediment, and deposition of sediment in layers (strata) Burial and lithification (hardening) of sediment into sedimentary rock. Sedimentary rocks are formed by the accumulation and hardening (lithification) of sediment. Clastic (or detrital) sediment weathering, erosion, transport and deposition of solid particles (rock fragments and mineral grains) derived from pre-existing rocks (e. g. sand, gravel) Chemical sediment - consisting of mineral matter precipitated from a solution (e. g. salt) Chemical weathering: breakdown or decomposition of minerals due to chemical reactions of minerals with water or gases in the air (e. g. rusting of iron-rich minerals, dissolution (dissolving) of limestone). Resistance to weathering is related to crystalline structure and stability at. Greater resistance to weathering for minerals at base" of bowen"s. Reaction series (more covalent silica bonds, more stable at lower temperatures)
