chap06 - Chapter 6 Sedimentary Rocks Geology 11 Principles...

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Chapter 6 Sedimentary Rocks Geology 11 – Principles of Geology A. M. P. Tengonciang National Institute of Geological Sciences University of the Philippines, Diliman
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6.1 Weathering … is the chemical and physical breakdown of rock exposed to air, moisture and organic matter. ± Agents of weathering: wind, water, ice ± Types of weathering 1. Mechanical a. Frost wedging – expansion of water as it freezes within fractures in rocks b. Crystal growth – growth of minerals along fractures c. Exfoliation or unloading – large, curved slabs of rock break off from the surface of igneous rocks due to release of pressure d. Thermal expansion – outer shells of rocks are heated faster and break away as spalls e. Root wedging – fractures in rocks are penetrated by plant roots 2. Chemical a. Dissolution – minerals dissolve into soluble species (e.g. ions in solution) b. Oxidation – involves electron transfer from one element to another (change of valance) c. Hydrolysis – H + substitute for an cation in a silicate mineral (key process in silicate weathering)
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6.1 Weathering
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chap06 - Chapter 6 Sedimentary Rocks Geology 11 Principles...

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