Hydrogen isotope fractionation in the system H2O-liquid NaAlSi308: new data and comments on D/H fractionation in hydrothermal experiments

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Measurements in the system H2O-NaAlSi308 at P=2 kbar and T=870 and 1250°C indicate that the vapour is enriched in D relative to the silicate melt by 8 to 25%o. The large error margins of the data are due to the important changes in the isotopic compositions of the charges that are caused by the kinetic fractionations associated with hydrogen diffusion through platinum capsules in high-temperature, high-pressure experiments. A new interpretation of these effects is, presented, and it is concluded that the equilibrium hydrogen fractionation should be at least 25%o between 870 and 1250°C at 2-kbar pressure.

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