Hydrogen isotope fractionation between kaolinite and water revisited |
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| Institution: | 1. Planetary & Space Sciences, The Open University, Walton Hall, MK7 6AA, UK;2. Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Muséum National d''Histoire Naturelle, Sorbonne Universités, CNRS, UPMC & IRD, 75005 Paris, France;3. Earth Sciences department, Natural History Museum, London, SW7 5BD, UK;4. NASA Johnson Space Center, Mailcode XI2, 2101 NASA Parkway, Houston, TX 77058, USA;5. Department of Civil & Environmental Engineering & Earth Science, University of Notre Dame, IN 46556, USA;1. Jacobs, NASA-Johnson Space Center, Mail Code X13, Houston, TX 77058, USA;2. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA;3. National High Magnetic Field Lab, Florida State University, Tallahassee, FL 32310, USA;4. ARES, NASA-Johnson Space Center, Houston, TX 77058, USA;5. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA;6. Dept. of Earth & Space Sciences, University of Washington, Seattle, WA, USA;7. Dept. of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, USA;1. Center for Isotope Cosmochemistry and Geochronology, Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, TX 77058, USA;2. Jacobs, NASA Johnson Space Center, Mail Code XI3, Houston, TX 77058, USA;3. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015-1305, USA;4. Department of Geological Sciences, University of North Carolina, Chapel Hill, NC 27599, USA;5. University of Texas at El Paso/Jacobs-JETS, Houston, TX 77058, USA;1. WiscSIMS, Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, USA;2. Kingsborough Community College and Graduate Center, The City University of New York, 2001 Oriental Boulevard, Brooklyn, NY 11235-2398, USA;3. American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192, USA;1. Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;3. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;4. John de Laeter Center, TIGeR Applied Geology, Curtin University, Perth, WA 6945, Australia |
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| Abstract: | The equilibrium hydrogen isotope fractionation factor (α) between kaolinite and water in the temperature range 330 to 0°C is 1000 In αkaol-water = ?2.2 × 106T?2 ? 7.7. This monotonic expression is based on a combination of experimental data with >75% of exchange and empirical calibrations. The previously proposed and widely accepted complex fractionation expression is considered to reflect the role of surface and intersite fractionation effects in the low percent of exchange experiments(Liu and Epstein, 1984), and incorrect δD water values for the empirical values (Lambert and Epstein, 1980). There is no measurable fractionation between dickite and kaolinite. The temperature dependence of the kaolinite-water hydrogen isotope fractionation factor can probably be used as a model for other phyllosilicate-water systems below 350°C. |
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