Calcite-Dolomite-Magnesite Stability Relations in Solutions at Elevated Temperatures

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Abstract
The stability relations of calcite, dolomite, and magnesite in aqueous CaCl2-MgCl2-CO2 solutions have been determined between 275° and 420°C. Small quantities of the carbonates were allowed to equilibrate with large volumes of aqueous solutions, permitting the approach of phase boundaries from two directions. Experimental data indicate that the stability field of calcite narrows toward higher temperatures, dolomite is incongruently soluble, and magnesite stability extends into the calcium-rich portion of the system.