Experimentally determined postspinel transformation boundary in Mg<sub>2</sub>SiO<sub>4</sub> using MgO as an internal pressure standard and its geophysical implications

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  • Y. Fei
    Geophysical Laboratory Carnegie Institution of Washington Washington DC USA
  • J. Van Orman
    Geophysical Laboratory Carnegie Institution of Washington Washington DC USA
  • J. Li
    Geophysical Laboratory Carnegie Institution of Washington Washington DC USA
  • W. van Westrenen
    Geophysical Laboratory Carnegie Institution of Washington Washington DC USA
  • C. Sanloup
    Geophysical Laboratory Carnegie Institution of Washington Washington DC USA
  • W. Minarik
    Geophysical Laboratory Carnegie Institution of Washington Washington DC USA
  • K. Hirose
    Department of Earth and Planetary Sciences Tokyo Institute of Technology Tokyo Japan
  • T. Komabayashi
    Department of Earth and Planetary Sciences Tokyo Institute of Technology Tokyo Japan
  • M. Walter
    Institute for Study of the Earth's Interior Okayama University Misasa Japan
  • K. Funakoshi
    Japan Synchrotron Radiation Research Institute, SPring‐8 Hyogo Japan

書誌事項

公開日
2004-02
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2003jb002562
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We have determined the postspinel transformation boundary in Mg<jats:sub>2</jats:sub>SiO<jats:sub>4</jats:sub> by combining quench technique with in situ pressure measurements, using multiple internal pressure standards including Au, MgO, and Pt. The experimentally determined boundary is in general agreement with previous in situ measurements in which the Au scale of <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#jgrb13858-bib-0001"><jats:italic>Anderson et al.</jats:italic> [1989]</jats:ext-link> was used to calculate pressure: Using this pressure scale, it occurs at significantly lower pressures compared to that corresponding to the 660‐km seismic discontinuity. In this study, we also report new experimental data on the transformation boundary determined using MgO as an internal standard. The results show that the transition boundary is located at pressures close to the 660‐km discontinuity using the MgO pressure scale of <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#jgrb13858-bib-0020"><jats:italic>Speziale et al.</jats:italic> [2001]</jats:ext-link> and can be represented by a linear equation, <jats:italic>P</jats:italic>(GPa) = 25.12 − 0.0013<jats:italic>T</jats:italic>(°C). The Clapeyron slope for the postspinel transition boundary is precisely determined and is significantly less negative than previous estimates. Our results, based on the MgO pressure scale, support the conventional hypothesis that the postspinel transformation is responsible for the observed 660‐km seismic discontinuity.</jats:p>

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