Table 3 |
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Reactions used to model the precipitation of low temperature iron and silica oxyhydroxides in the system Fe–Si–O–H shown in Fig. 7 |
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Fe (OH)3 (fresh ferric hydroxide) (s) + 2H+ = |
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Fe2+ + 5/2 H2O + 1/4O2 |
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Fe3(OH)8 (fresh ferrosic hydroxide) + 6H+ = |
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3Fe2+ + 7H2O + 1/2O2 |
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3Fe(OH)3 (fresh ferric hydroxide) = |
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Fe3(OH)8 (fresh ferrosic hydroxide) + 1/2H2O + 1/4O2 |
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Fe3(OH)8 (fresh ferrosic hydroxide) = |
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3Fe(OH)2 (fresh ferrous hydroxide) + H2O + 1/2O2 |
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Fe(OH)2 (fresh ferrous hydroxide) + 2H+ = Fe2+ + 2H2O |
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SiO2 (amorphous) + 2H2O = Si(OH)4 |
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FeSiO3 (ferrosilite) + 3H2O = Fe(OH)2 (fresh ferrous hydroxide) + |
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Si (OH)4 |
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FeSiO3 (ferrosilite) + 10H2O + 1/2O2 = |
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Fe3(OH)8 (fresh ferrosic hydroxide) + 3Si(OH)4 |
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FeSiO3 (ferrosilite) + H2O + 2H+ = Fe2+ + Si(OH)4 |
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|
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Boyd and Scott Geochemical Transactions 2001 2:45 doi:10.1186/1467-4866-2-45 |
