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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Anomalous compressibility of ferropericlase throughout the iron spin cross-over
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Anomalous compressibility of ferropericlase throughout the iron spin cross-over

机译:整个铁旋转过程中阿魏酸酶的异常可压缩性

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摘要

The thermoelastic properties of ferropericlase Mg_(1-x)Fe_xO (x = 0.1875) throughout the iron high-to-low spin cross-over have been investigated by first principles at Earth's lower mantle conditions. This cross-over has important consequences for elasticity such as an anomalous bulk modulus (K_s) reduction. At room temperature the anomaly is somewhat sharp in pressure but broadens with increasing temperature. Along a typical geotherm it occurs across most of the lower mantle with a more significant K_s reduction at 1,400-1,600 km depth. This anomaly might also cause a reduction in the effective activation energy for diffusion creep and lead to a viscosity minimum in the mid-lower mantle, in apparent agreement with results from inversion of data related with mantle convection and postglacial rebound.
机译:已经通过第一性原理在地球的下地幔条件下研究了铁酸脱镁酶Mg_(1-x)Fe_xO(x = 0.1875)在整个铁从高到低自旋交叉的热弹性性质。这种交叉对弹性具有重要影响,例如反常的体积模量(K_s)降低。在室温下,异常压力有些明显,但随着温度的升高而扩大。沿着典型的地热,它发生在大部分下地幔中,在1,400-1,600 km深度处K_s减小幅度更大。这种异常也可能导致扩散蠕变的有效活化能降低,并导致地幔中下部粘度最小,这与地幔对流和冰川后回弹相关数据反演的结果显然吻合。

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  • 作者单位

    Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455 Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455;

    Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455 Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455 Escola Politecnica, Universidade de Sao Paulo, CP 61548, CEP 05424-970, Sao Paulo, Brazil;

    Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455 Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455;

    Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455;

    Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455 Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455;

    Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    earth's lower mantle; viscosity; thermodynamics; thermal expansivity;

    机译:地球的下地幔粘度热力学热膨胀率;

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