Chapter 7 LANGMUIR GEOL 414/514 CHEMICAL WEATHERING

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CHEMICAL WEATHERING - 3 • Hydrolysis (of silicates) • Most silicates weather by hydrolysis • Mg 2SiO 4 + H 2CO 3 → 2Mg +2 + 4HCO 3 -2 + H4SiO 4 • Silicic acid is weaker than carbonic acid and is very weakly ionized • Weathering scheme is very complex due to the presence of several different cations in silicates CHEMICAL WEATHERING - 4 • Alumino-silicates weathering clay minerals • Hydrolysis of silicates increases basicity of system - OH - or HCO 3 - ions produced • Constraint of pH: (keeps pH 9.0) • H 2O + SiO 2 (qtz) + OH - → H 3SiO 4 - K=10 0.4 • H 4SiO 4 (aq) + OH - → H 3SiO 4 - + H2O K=10 4.2 10
THE SOIL Weathering of the Earth’s crust: raw materials for soil formation Igneous rocks Sedimentary rocks Metamorphic rocks Soil has three (four) components: Mineral (inorganic) Organic matter Pore spaces (air & water) THE SOIL 11
Page 1 and 2: GEOL 414/514 CHEMICAL WEATHERING Ch
Page 3 and 4: COMMON WEATHERING PRODUCTS ROCK WEA
Page 5 and 6: CHANGES IN ROCK COMPOSITION • Exp
Page 7 and 8: COMPONENT VARIATION UPON WEATHERING
Page 9: CHEMICAL WEATHERING Types of reacti
Page 13 and 14: SOIL COMPOSITION Organic Component:
Page 15 and 16: The major soil textural classes are
Page 17 and 18: A Horizon Organic rich Highest orga
Page 19 and 20: SOIL CLASSIFICATION USDA Soil Class
Page 21 and 22: QUARTZ SOLUBILITY • Silica and th
Page 23 and 24: QUARTZ SOLUBILITY - 5 KAOLINITE SOL
Page 25: KAOLINITE SOLUBILITY - 4 It is not

Chapter 7 LANGMUIR GEOL 414/514 CHEMICAL WEATHERING

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