Phase Equilibria in the System CaCO3-MgCO3-FeCO3 |
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| Authors: | ANOVITZ L M; ESSENE E J |
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| Institution: | Department of Geological Science, The University of Michigan Ann Arbor, Michigan 48109 |
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| Abstract: | Experimental data on phase relations in the CaCO3-MgCO3-FeCO3ternary by Goldsmith et al. (1962) are inconsistent with thoseof Rosenberg (1967). These inconsistencies cannot be reconciledby the pressure or temperature differences between the two setsof experiments. Available reversed experiments on the binarysystems have been re-evaluated to yield consistent binary solvi.These data have been combined with analyses of natural carbonatesto yield approximate ternary phase diagrams at 250,400,550,and 700 ?C, and 4 to model ternary activity/composition relationsfor calcite- and dolomite-structure carbonates. An empiricalmodel for thermometry with calcite-ferroan dolomite was derivedfrom the ternary solvus by fitting an empirical equation tothe calcite limb of the ternary solvus. This model appears toextend reliably to higher iron contents than the models of Bickle* Powell (1977) and Powell et al. (1984). |
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