The system NaCl---CaCl 2 ---H 2 O: I. The ice liquidus at 1 atm total pressure

Details The system NaCl---CaCl 2 ---H 2 O: I. The ice liquidus at 1 atm total pressure The system NaCl---CaCl 2 ---H 2 O: I. The ice liquidus at 1 atm total pressure

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54..603o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 3, pp.603-610

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30

Scientific paper

Phase relations in the ice-stable field of the system NaCl---CaCl 2 ---H 2 O have been determined under 1 atm total pressure along the NaCl---H 2 O and CaCl 2 ---H 2 O binaries and along five pseudobinaries with constant NaCl /( NaC 1+ CaCl 2 ) weight ratios. The results are in excellent agreement with published data along the NaCl---H 2 O binary but show large discrepancies when compared to previous determinations of the ice liquidus along the CaCl 2 ---H 2 O binary and in the NaCl---CaCl 2 ---H 2 O ternary. Eutectic temperatures and compositions are -21.20°C (±0.01 °) and 23.2 wt% for the NaCl---H 2 O binary and -49.95°C (±0.15°) and 30.33 wt% for the CaCl 2 ---H 2 O binary. The minimum temperature reached during our experiments in the ternary system was -34°C; therefore, we do not report isotherms below -35°C or the ternary eutectic temperature. At moderate to high salinities, isotherms cross the ice sub-field at lower total salt concentrations than previously reported. Fluid inclusion salinities determined from previously published freezing-point data may be in error by as much as 2 wt% total salt. In addition, NaCl /( NaCl + CaCl 2 ) weight ratios estimated from hydrohalite- and ice-melting temperatures may be in error by as much as 0.15.

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