Chapter 7 LANGMUIR GEOL 414/514 CHEMICAL WEATHERING

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GENERAL OBSERVATIONS 5. The rate of chemical weathering inc with inc temp 6. Chemical weathering generally involves the attack of H 2O & assoc acidity, & atmos O 2 (oxid'n) on P.M.'s 7. Compared with the parent rock, mineral products of weathering are usually more hydrated (as clays), have lower metal cation conc's relative to Al & Si (clays & qtz), are oxidized (Fe +3 oxyhydroxides), or are chem ppts such as carbonates or evaporites 8. Dissolved products of weathering include major cations & anions in natural waters & dissolved silica GENERAL OBSERVATIONS • Problem in determining detailed weathering reactions • Need chemical analysis at different stages of weathering • Difficult to know if different stages sampled had same original composition • Also need reference mineral or element; one that weathers little • Must make several key assumptions 2
COMMON <strong>WEATHERING</strong> PRODUCTS ROCK <strong>WEATHERING</strong> (from Brownlow) 3
Page 1: GEOL 414/514 CHEMICAL WEATHERING Ch
Page 5 and 6: CHANGES IN ROCK COMPOSITION • Exp
Page 7 and 8: COMPONENT VARIATION UPON WEATHERING
Page 9 and 10: CHEMICAL WEATHERING Types of reacti
Page 11 and 12: THE SOIL Weathering of the Earth’
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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