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EASC 101 (3)
Lecture 5

Lecture 5.odt

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Simon Fraser University
Earth Sciences
EASC 101
Glyn Williams- Jones

Ch.7: weathering & Ch.8: Sedimentary Rocks Weathering: the breakdown of minerals and rocks by mechanical (physical), biological, or chemical processes Erosion: the transport of weathered material Types of Weathering Physical weathering: mechanical breakdown of minerals and rocks w/o a change to its chemical composition. (Fig. 7.6) i) Abrasion: grain to grain contact Freeze-thaw: water in cracks freezes overnight and expands the next day. Repeated expansions widen fractures (Fig. 7.7) iii) Hydraulic action: The energetic force of moving water can break down rock and minerals Pressure release: Tectonic uplift and erosion over time removes overburden. Expansion of once deeply buried rock results in joints (fractures). (Fig. 7.4) -Pressure release also occurs with plutonic rocks, forming sheet joints (curved joints). (Fig. 7.5) Biological weathering: disintegration of rock physically or chemically by loving organisms. Chemical weathering: the chemical decomposition of minerals in rock. -New sedimentary minerals may form as a weathering product and some compounds will be dissolved in water. Hydrolysis: The chemical weathering silicate minerals by weakly acidic waters.(Fig. 7.10) Oxidation: The chemical weat
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