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- W2043029640 abstract "A method of estimating an aqueous-solution composition from that of solid-solutions believed to be in equilibrium with it is derived. The low-temperature ternary Ca-Fe-Mg phase relations of the rhombohedral carbonates are investigated using this method, and their phase diagrams at 25 and 150°C are calculated. Algebraic manipulations of equilibrium constant equations representing dissolution of the carbonates yield equations for the phase boundaries separating calcite from an ankerite-dolomite solid-solution and an ankerite-dolomite solid-solution from a siderite-magnesite solid-solution. A value for the free energy of formation of ankerite is estimated (−1818.0 ± 0.8 kJ/mol, 25°C) from compositions of natural coexisting carbonates. Necessary compositional information for the carbonates was derived from the relatively unmetamorphosed Early Proterozoic Marra Mamba Banded Iron-Formation of the Hamersley Basin of Western Australia. The method yielded information on the aFe2+aca2+ and aMg2+aca2+ ratios of the solutions that deposited the carbonates of the Marra Mamba. The method suggests a depositing solution for the carbonates of the Lower Marra Mamba Iron-Formation significantly richer in iron than was likely to have been the case for Early Proterozoic seawater." @default.
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- W2043029640 date "1992-08-01" @default.
- W2043029640 modified "2023-09-24" @default.
- W2043029640 title "Calculated aqueous-solution-solid-solution relations in the low-temperature system CaO-MgO-FeO-CO2-H2O" @default.
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- W2043029640 doi "https://doi.org/10.1016/0016-7037(92)90288-t" @default.
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