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The solubility of calcite in NaCl-H 2 O solutions was measured at 600-900 °C, 10 kbar, at NaCl concentrations ranging from dilute to near halite saturation, and at 6-14 kbar, 700 °C, in 30 mol% NaCl solutions. Solubility was determined from the weight loss of cleavage rhombs of a pure natural calcite after experiments of 1/2 to 6 days in a piston-cylinder apparatus with NaCl-graphite furnaces. CaCO 3  molality (m CaCO₃ ) increases greatly with NaCl mole fraction (X NaCl ): at 800 °C and 10 kbar, m CaCO₃  increases from ~0.1 in pure H 2 O to near 4.0 at halite saturation (X NaCl  ~ 0.6). There is also a large temperature effect at 10 kbar, with m CaCO₃  increasing from 0.25 at 600 °C to 3.0 at 900 °C at X NaCl  = 0.3. There is only a 20% increase with increasing pressure between 6 and 14 kbar at 700 °C and X NaCl  = 0.3. Melting to a carbonate-rich liquid was inferred at 900 °C, 10 kbar, from X NaCl  of 0 to 0.2. The composition, temperature, and pressure dependence of m CaCO₃  are described by:

american mineralogist

Experimental determination of calcite solubility in H 2 O-NaCl solutions at deep crust/ upper mantle pressures and temperatures: Implications for metasomatic processes in shear zones