Abstract
Solutions of 1–5 m NaCl, KCl, CaCl 2 and MgCl 2, and synthetic brines were analyzed for hydrogen and oxygen isotopic compositions by vacuum distillation-microequilibration techniques. No effect on the hydrogen isotopic composition was observed for any of the solutions within the precision of the technique of ±5‰ determined from analyses of distilled water. Oxygen isotopic compositions of solutions measured by vacuum distillation-microequilibration indicate that oxygen isotopes are not fractionated during analysis in NaCl, KCl and CaCl 2 solutions. Vacuum distillation-microequilibration analyses of MgCl 2 solutions show depletions in 18O relative to pure water that can be related to the concentration of Mg 2+ in the solution. The greatest depletion in 18O occurs in the 4 m MgCl 2 solutions which have δ 18O-vaIues 6‰ lower than that measured for pure water. Corrections based on the measurement of the δ 18O-values of the pure MgCl 2 solutions can also be applied to mixed chloride brines. Both melting and crushing of halite grown in solutions of known isotopic composition followed by microequilibration to determine the stable isotopic composition of fluid inclusions give results within the precision determined from analyses of distilled water.
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