Calculated aqueous-solution-solid-solution relations in the low-temperature system CaO-MgO-FeO-CO 2 -H 2 O

Details Calculated aqueous-solution-solid-solution relations in the low-temperature system CaO-MgO-FeO-CO 2 -H 2 O Calculated aqueous-solution-solid-solution relations in the low-temperature system CaO-MgO-FeO-CO 2 -H 2 O

Publishing date

Aug 1992

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3031w&link_type=abstract

Journals

Geochimica et Cosmochimica Acta, vol. 56, Issue 8, pp.3031-3043

Science

Computer Science

Additional info 2

5

Type

Scientific paper

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 a Fe 2+ / a ca 2+ and a Mg 2+ / a ca 2+ 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.

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