Chapter 7 LANGMUIR GEOL 414/514 CHEMICAL WEATHERING
Chapter 7 LANGMUIR GEOL 414/514 CHEMICAL WEATHERING
Chapter 7 LANGMUIR GEOL 414/514 CHEMICAL WEATHERING
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<strong>CHEMICAL</strong> <strong>WEATHERING</strong><br />
Types of reactions, cont:<br />
• Carbonate weathering<br />
key is CO 3 -2 + H + HCO 3 -2 (stable)<br />
• Oxidation<br />
• Fe and Mn compounds<br />
• Other sulfides<br />
• most decomposition reactions<br />
occur in steps - many not yet<br />
clearly understood<br />
<strong>CHEMICAL</strong> <strong>WEATHERING</strong> -2<br />
Oxidation of pyrite:<br />
Oxidation of S:<br />
2FeS 2 + 7O 2 + 2H 2O → 2FeSO 4 + 2H 2SO 4<br />
Oxidation of Fe:<br />
4FeSO 4 + O 2 + 2H 2SO 4 → 2Fe(SO 4) 3 + 2H 2O<br />
Hydrolysis of Fe +3 :<br />
Fe(SO 4) 3 + 6H 2O → 2Fe(OH) 3(s) + 3H 2SO 4<br />
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