Effects of Water on the α-β Transformation Kinetics in San Carlos Olivine

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  • Tomoaki Kubo
    T. Kubo and E. Ohtani, Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University, Sendai 980–8578, Japan. T. Kato, Institute of Geoscience, University of Tsukuba, Tsukuba 305–0006, Japan. T. Shinmei and K. Fujino, Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo 060–0810, Japan.
  • Eiji Ohtani
    T. Kubo and E. Ohtani, Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University, Sendai 980–8578, Japan. T. Kato, Institute of Geoscience, University of Tsukuba, Tsukuba 305–0006, Japan. T. Shinmei and K. Fujino, Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo 060–0810, Japan.
  • Takumi Kato
    T. Kubo and E. Ohtani, Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University, Sendai 980–8578, Japan. T. Kato, Institute of Geoscience, University of Tsukuba, Tsukuba 305–0006, Japan. T. Shinmei and K. Fujino, Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo 060–0810, Japan.
  • Toru Shinmei
    T. Kubo and E. Ohtani, Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University, Sendai 980–8578, Japan. T. Kato, Institute of Geoscience, University of Tsukuba, Tsukuba 305–0006, Japan. T. Shinmei and K. Fujino, Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo 060–0810, Japan.
  • Kiyoshi Fujino
    T. Kubo and E. Ohtani, Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University, Sendai 980–8578, Japan. T. Kato, Institute of Geoscience, University of Tsukuba, Tsukuba 305–0006, Japan. T. Shinmei and K. Fujino, Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo 060–0810, Japan.

Bibliographic Information

Published
1998-07-03
DOI
  • 10.1126/science.281.5373.85
Publisher
American Association for the Advancement of Science (AAAS)

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Description

<jats:p>In experiments at 13.5 gigapascals and 1030°C, the growth rate of wadsleyite, which forms from transformation of olivine, was substantially enhanced by the presence of water. Wadsleyite had a low dislocation density and subgrain boundaries in wet runs. Water enhanced the dislocation recovery in wadsleyite and therefore caused inelastic relaxation of the localized pressure drop associated with the transformation, resulting in an increase of the growth rate in wet runs. These results imply that even a small amount of water of 0.05 weight percent can weaken wadsleyite in the mantle.</jats:p>

Journal

  • Science

    Science 281 (5373), 85-87, 1998-07-03

    American Association for the Advancement of Science (AAAS)

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