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Robert M. Garrels – One of the best experts on this subject based on the ideXlab platform.

  • Calculated aqueous-solution-solid-solution relations in the low-temperature system CaO-MgO-FeO-CO2-H2O
    Geochimica et Cosmochimica Acta, 1992
    Co-Authors: Terri L. Woods, Robert M. Garrels

    Abstract:

    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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  • Calculated aqueous-solution-solid-solution relations in the low-temperature system CaO-MgO-FeO-CO2-H2O
    Geochimica et Cosmochimica Acta, 1992
    Co-Authors: Terri L. Woods, Robert M. Garrels

    Abstract:

    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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Terri L. Woods – One of the best experts on this subject based on the ideXlab platform.

  • Calculated aqueous-solution-solid-solution relations in the low-temperature system CaO-MgO-FeO-CO2-H2O
    Geochimica et Cosmochimica Acta, 1992
    Co-Authors: Terri L. Woods, Robert M. Garrels

    Abstract:

    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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  • Calculated aqueous-solution-solid-solution relations in the low-temperature system CaO-MgO-FeO-CO2-H2O
    Geochimica et Cosmochimica Acta, 1992
    Co-Authors: Terri L. Woods, Robert M. Garrels

    Abstract:

    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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Stuart R Haszeldine – One of the best experts on this subject based on the ideXlab platform.

  • co2 sequestration by mineral trapping in natural analogues in the yinggehai basin south china sea
    Marine and Petroleum Geology, 2019
    Co-Authors: Niklas Heinemann, Mark Wilkinson, Zhenfeng Wang, Stuart R Haszeldine

    Abstract:

    Abstract Mineral trapping of CO2 by precipitation of carbonate minerals is seen as the most permanent and secure mechanism of CO2 storage. We have investigated mineral trapping in CO2-rich siliciclastic reservoirs of the Upper Miocene age in the Yinggehai Basin (South China Sea) and used nearby CO2-poor reservoirs of similar age as benchmarks for the analysis. Within the reservoir, the CO2 has triggered the reaction from calcite plus chlorite to Ankerite plus kaolinite, which traps 5 mol of CO2 per mole of chlorite. Geochemical modelling shows that the total amount of permanently trapped CO2 is approximately one half of the CO2 in the newly formed Ankerite. Caprock mineralogy shows that CO2 leakage has occurred and CO2 has migrated into the shale-rich caprock, but without loss of caprock integrity.

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