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Hydrogen isotope fractionation between OH-bearing minerals and water

Suzuoki, Tetsuro and Epstein, Samuel (1976) Hydrogen isotope fractionation between OH-bearing minerals and water. Geochimica et Cosmochimica Acta, 40 (10). pp. 1229-1240. ISSN 0016-7037. doi:10.1016/0016-7037(76)90158-7.

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Hydrogen isotope fractionation factors between hydroxyl-bearing minerals and water were determined at temperatures ranging between 400 and 850°C. The hydrogen isotope exchange rates for the mineral-water pairs examined were very slow. In most cases it was necessary to use an interpolation method for the determination of the hydrogen isotope equilibrium fractionation factor, α_e. For the temperature range of 450–850°C the hydrogen isotope fractionation factors for the mica-water and amphibole-water systems are simply expressed as a function of temperature and the molar fractions of the six-fold coordinated cations in the crystal, regardless of mineral species, as follows: 10^3 In α_(e(mineral-water)) = − 22.4 (10^6T^(−2)) + 28.2 + (2X_(Al) − 4X_(Mg) − 68X_(Fe)), where X is the molar fraction of the cations. As the equation indicates, for any specific composition of the OH-bearing minerals, the change of α_e with temperature, over the temperature range investigated, is the same for all minerals studied. Thus for any specified values of X_(Al), X_(Mg), and X_(Fe) for these minerals, the relationship between α_e and T is 10^3 In α_e = αT^(−2) + k. Consequently, hydrogen isotope fractionation among coexisting minerals is temperature independent and cannot be used as a hydrogen isotope geothermometer. Some exceptions to the above general observations exist for minerals such as boehmite and kaolinite. In these minerals hydrogen bonding modifies the equilibrium hydrogen isotopic fractionation between mineral and water.

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Additional Information:© 1976 Pergamon Press. Received 23 November 1975; accepted in revised form 7 April 1976. We wish to thank Professor H. P. TAYLOR, JR. and Professor A. L. ALBEE for stimulating discussions and for supplying the samples for some of this work. Our gratitude to Dr. PAUL KNAUTH for a critical reading of this manuscript. We also thank Mrs. E. BINGHAM for performing the emission spectrographic analyses. Financial support was provided by the National Science Foundation Grant No. GA-12945.
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Issue or Number:10
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Official Citation:Tetsuro Suzuoki, Samuel Epstein, Hydrogen isotope fractionation between OH-bearing minerals and water, Geochimica et Cosmochimica Acta, Volume 40, Issue 10, October 1976, Pages 1229-1240, ISSN 0016-7037, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42394
Deposited By: Ruth Sustaita
Deposited On:12 Nov 2013 22:20
Last Modified:10 Nov 2021 16:22

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