Synthetic fluid inclusions: VIII. Vapor-saturated halite solubility in part of the system NaCl-CaCl 2 -H 2 O, with application to fluid inclusions from oceanic hydrothermal systems

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Halite solubility along part of the vapor-saturated liquidus in the system NaCl - CaCl 2 - H 2 O has been determined using the synthetic fluid inclusion technique. Data allow the construction of liquidus isotherms for temperatures up to 500°C and bulk compositions containing >60 wt% total salt and as much as 25 wt% CaCl 2 . Combined with previous data for the binary system NaCl - H 2 O and for the ternary system NaCl - CaCl 2 - H 2 O in the low-salinity, low-temperature region, a preliminary ternary phase diagram can be constructed that remains incomplete only in the CaCl 2 -rich region. Results are applied to the interpretation of saline fluid inclusions from quartz veins in oceanic metagabbros, and can be applied to many other natural inclusions containing aqueous solutions with NaCl and CaCl 2 the dominant solutes. Microthermometric measurements at equilibrium of the melting temperature of ice [ Tm (ice)] and of the dissolution temperature of halite [ Tm (halite)] are sufficient to determine the bulk composition of the NaCl - CaCl 2 - H 2 O fluid.

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