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- W2064162521 abstract "Molecular hydrogen was used as an exchange medium to make indirect determinations of hydrogen isotope fractionation factors between hydrous minerals (epidote, kaolinite, muscovite, biotite, and hornblende) and water at temperatures between 150 and 400°C. Hydrogen isotope exchange between hydrous minerals and H2 is found to be unusually rapid at these temperatures and, in the absence of reducible iron, may represent true diffusive exchange. Two methods were used for the exchange: (1) the molecular hydrogen provided an “infinite” reservoir of H2 and (2) the mineral provided an “infinite” reservoir of H2. Results of these methods are in good agreement for epidote and kaolinite, suggesting that “surface effects” are not important for these experiments. Fractionation factors in the epidote-H2 system, expressed as 1000lnα, increase linearly with increasing 1T2 (or decreasing temperature) between temperatures of 150 and 400°C. This behavior is also true for epidote-water fractionation factors calculated from published H2O (vapor) — H2 and H2O (vapor) — H2O(liquid) fractionation factors. Values of 1000lnα for kaolinite-H2 and muscovite-H2 fractionation factors are similar and also decrease linearly with increasing 1T2 between 200 and 275°C, and 200 and 400°C, respectively. There is a small departure from such linearity at temperatures of less than 200°C for the kaolinite-H2 system. The trends of the calculated kaolinite-H2O fractionation factors with temperature are similar to those previously published, with a maximum at about 200°C. Muscovite-H2O fractionation factors also decrease with decreasing temperatures and become increasingly positive at temperatures lower than about 225°C. Problems of reduction of iron and a concomitant increase in the amount of water were encountered in exchange experiments involving biotite, hornblende, and, to a lesser extent, muscovite. The consequences of these reactions were the production of apparent relatively small mineral-H2 and large mineral-H2O equilibrium fractionation factors and support the hypothesis that hydroxyl groups are added to sites linked to iron and that there is indeed a compositional effect on hydrogen isotope fractionations in mineral-H2O systems. The new equilibrium fractionation factors determined in this study do not unambiguously resolve serious conflicts in data published by previous workers, but do provide some important constraints on the direction and magnitude of the DH fractionation factors between water and the common rock-forming minerals." @default.
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- W2064162521 date "1996-07-01" @default.
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- W2064162521 title "Hydrogen isotope exchange reactions between hydrous minerals and molecular hydrogen: I. A new approach for the determination of hydrogen isotope fractionation at moderate temperatures" @default.
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- W2064162521 doi "https://doi.org/10.1016/0016-7037(96)00103-2" @default.
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