A Model for the PTX Properties of H2O-NaCl
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A statistical model that relates the vapor pressure of H2O-NaCl to the fluid temperature and composition has been developed. The model consists of equations that predict the vapor pressure of H2O-NaCl from the eutectic temperature (-21.2Â°C) to 1500Â°C and for all compositions between the pure end-members. The model calculates the vapor pressure based on the composition (wt% NaCl) and the temperature of homogenization, which can be directly obtained from laboratory studies of fluid inclusions. This information in turn can be used to construct the isochore, or line of constant volume, along which the fluid inclusion was trapped. Finally the isochore can be used to determine the temperature and pressure at which the host mineral of the fluid inclusion was trapped.
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