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February 28, 2026SCIENTIA SINICA Terrae0 citationsOpen Access

基于地磁日变化信号的欧洲上地幔与转换带电导率研究

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DYDaolin YangSXShan XuCCChaojian Chen

Key Points

  • This research aims to investigate the electrical conductivity of the upper mantle and its correlation with water content and temperature.
  • Analyzed geomagnetic data from 163 mid-latitude stations from 1997 to 2021.
  • Fitted spherical harmonics to the Sq equivalent current at frequencies of 1-6 cpd.
  • Used iteratively reweighted least squares (IRLS) for estimating parameters.
  • Inverted conductivity models at selected observation sites using L-BFGS algorithm.
  • Electrical conductivity at ASP and KIV is lower than reference values.
  • Measured water content at ASP is approximately 0.1 wt.% in the upper mantle.
  • Conductivity in mid-eastern Europe is lower than surrounding depths with Cw<0.1 wt.% and increases in the southern upper mantle to Cw≈0.1-0.3 wt.% .
  • Suggests Mediterranean plate might dehydrate before subducting into the transition zone.

Abstract

长期观测的地磁台站为探究地幔电导率,进而约束地幔水含量、温度和部分熔融等采集了丰富的数据。本文应用1997至2021年163个中纬度地磁观测台站信号,由水平磁场频率为1-6 cpd(cycle per day)的球谐项拟合Sq等效电流,统计春分与秋分前后磁静日场源的平均球谐参数,并计算与径向磁场间的转换参数,线性方程组由迭代重加权最小二乘回归(IRLS)算法得到估计值。爱丽斯泉站(code: ASP)与欧洲观测台站位置的一维地幔电导率模型按照L-BFGS算法反演,并计算实时地表磁场。参考Yoshino等的地幔矿石水含量实验,结果发现:ASP与基辅站(code: KIV)位置上地幔电导率小于参考值,ASP台站地幔转换带水含量Cw≈0.1 wt.%。欧洲中东部上地幔电导率低于周围同深度值,Cw<0.1 wt.%;南部上地幔和MTZ上层的电导率增加,Cw≈0.1-0.3 wt.%,因此地中海板块可能在俯冲至MTZ下层前脱水;随着深度增加,MTZ电导率的水平分布逐渐均匀,MTZ下层水含量增加至1 wt.%。

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Cite This Study

Yang et al. (2026) studied this question.

synapsesocial.com/papers/69a288170a974eb0d3c04224https://doi.org/10.1360/sste-2025-0273
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