Calculation of the thermodynamic and geochemical consequences of nonideal mixing in the system H 2 O-CO 2 -NaCl on phase relations in geologic systems: Equation of state for H 2 O-CO 2 -NaCl fluids at high pressures and temperatures

Details Calculation of the thermodynamic and geochemical consequences of nonideal mixing in the system H 2 O-CO 2 -NaCl on phase relations in geologic systems: Equation of state for H 2 O-CO 2 -NaCl fluids at high pressures and temperatures Calculation of the thermodynamic and geochemical consequences of nonideal mixing in the system H 2 O-CO 2 -NaCl on phase relations in geologic systems: Equation of state for H 2 O-CO 2 -NaCl fluids at high pressures and temperatures

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.1247s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 7, pp.1247-1275

Mathematics

Logic

69

Scientific paper

Fluid inclusion analyses leave little doubt that solutions containing large concentrations of H 2 O, CO 2 , and electrolytes are involved in a wide range of geologic processes. Although the miscibility gap in the system H 2 O-CO 2 occurs only at low temperatures, experimental data reported by and (1965) and (1980) indicate that the addition of 6 weight percent NaCl relative to H 2 O + Nacl extends the region of immiscibility in the system H 2 O-CO 2 -NaC] to 700°C at 500 bars and mole fractions of CO 2 ( X CO 2 ) 0.1. In contrast, addition of 20 weight percent NaCl relative to H 2 O + NaCl at 700°C and 500 bars expands the miscibility gap to X CO 2 0.2. At 2000 bars, addition of 20 and 35 weight percent NaCl relative to H 2 O + NaCl causes the miscibility gap to extend to ~500° and ~700°C, respectively, at X CO 2 0.3. The existence of the immiscible region in this high-pressure/temperature environment has a profound effect on temperatures of equilibration for metamorphic mineral assemblages ( and , 1983). To determine the extent to which nonideality in the ternary system affects these equilibria, the modified Redlich-Kwong (MRK.) equation of state was fit to pressure-volume-temperature data taken from Gehrig (1980) along pseudobinaries for which X NaCl / X H 2 O is constant. Fugacity coefficients of the components were then generated from the fugacity coefficient analog of the MRK equation of state and these coefficients were used together with solubility data to determine the compositions of the coexisting immiscible phases. The tie lines connecting the coexisting phases shift in orientation from nearly parallel to the H 2 O-CO 2 binary at low temperatures to almost perpendicular to this binary at high temperatures.

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