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Global electromagnetic induction constraints on transition-zone water content variations

机译：全球电磁感应对过渡带水含量变化的限制

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摘要

Small amounts of water can significantly affect the physical properties of mantle materials, including lowering of the solidus, and reducing effective viscosity and seismic velocity. The amount and distribution of water within the mantle thus has profound implications for the dynamics and geochemical evolution of the Earth. Electrical conductivity is also highly sensitive to the presence of hydrogen in mantle minerals. The mantle transition zone minerals wadsleyite and ringwoodite in particular have high water solubility, and recent high pressure experiments show that the electrical conductivity of these minerals is very sensitive to water content. Thus estimates of the electrical conductivity of the mantle transition zone derived from electromagnetic induction studies have the potential to constrain the water content of this region. Here we invert long period geomagnetic response functions to derive a global-scale three-dimensional model of electrical conductivity variations in the Earth's mantle, revealing variations in the electrical conductivity of the transition zone of approximately one order of magnitude. Conductivities are high in cold, seismically fast, areas where slabs have subducted into or through the transition zone. Significant variations in water content throughout the transition zone provide a plausible explanation for the observed patterns. Our results support the view that at least some of the water in the transition zone has been carried into that region by cold subducting slabs.
机译：少量的水会显着影响地幔材料的物理性质，包括降低固相线并降低有效粘度和地震速度。因此，地幔中的水量和分布对地球的动力学和地球化学演化具有深远的影响。电导率对地幔矿物中氢的存在也高度敏感。地幔过渡带矿物中的瓦兹利石和林伍德石具有很高的水溶性，最近的高压实验表明，这些矿物的电导率对水含量非常敏感。因此，从电磁感应研究得出的地幔过渡带电导率估计值有可能限制该区域的水含量。在这里，我们反转了长期的地磁响应函数，以得出地球地幔中电导率变化的全局尺度三维模型，揭示了过渡带电导率变化大约一个数量级。在板块俯冲进入过渡带或通过过渡带的寒冷地区，电导率很高。整个过渡带水含量的明显变化为观察到的模式提供了合理的解释。我们的结果支持这样的观点，即过渡带中至少有一些水已通过冷俯冲板带入该区域。

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  • 来源
    《Nature》 |2009年第7258期|1003-1006|共4页
  • 作者

    Anna Kelbert; Adam Schultz; Gary Egbert;

  • 作者单位

    College of Oceanic & Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331-5503, USA;

    College of Oceanic & Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331-5503, USA;

    College of Oceanic & Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331-5503, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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