A perovskitic lower mantle inferred from high-pressure, high-temperature sound velocity data

DOI DOI PDF PDF PDF ほか3件をすべて表示 一部だけ表示 被引用文献50件 参考文献37件

書誌事項

公開日
2012-05
資源種別
journal article
権利情報
  • http://www.springer.com/tdm
DOI
  • 10.1038/nature11004
  • 10.1007/s12594-012-0111-2
公開者
Springer Science and Business Media LLC

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説明

The determination of the chemical composition of Earth's lower mantle is a long-standing challenge in earth science. Accurate knowledge of sound velocities in the lower-mantle minerals under relevant high-pressure, high-temperature conditions is essential in constraining the mineralogy and chemical composition using seismological observations, but previous acoustic measurements were limited to a range of low pressures and temperatures. Here we determine the shear-wave velocities for silicate perovskite and ferropericlase under the pressure and temperature conditions of the deep lower mantle using Brillouin scattering spectroscopy. The mineralogical model that provides the best fit to a global seismic velocity profile indicates that perovskite constitutes more than 93 per cent by volume of the lower mantle, which is a much higher proportion than that predicted by the conventional peridotitic mantle model. It suggests that the lower mantle is enriched in silicon relative to the upper mantle, which is consistent with the chondritic Earth model. Such chemical stratification implies layered-mantle convection with limited mass transport between the upper and the lower mantle.

収録刊行物

  • Nature

    Nature 485 (7396), 90-94, 2012-05

    Springer Science and Business Media LLC

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