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Curie point depth from spectral analysis of magnetic data in Taiwan

机译：台湾磁数据频谱分析的居里点深度

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摘要

This study constructs an integrated magnetic anomaly map of Taiwan and its vicinity that combines land magnetic data and marine magnetic data. The reduction to pole (RTP) correction method was applied to the integrated magnetic anomaly data. The corrected magnetic anomaly results for a region roughly 880 km in width and 660 km in length fit well with geological tectonic signatures and are used to estimate the Curie point isotherm. The adopted Curie point depth method provides a relationship between the 2-D FFT power spectrum of the magnetic anomalies and the depth of magnetic sources by transforming the spatial data into the frequency domain. The basal depth of the magnetic sources is calculated from the magnetic data. Finally, the Curie point depth of Taiwan is obtained. The highest value of 17 km is located in northern Taiwan, and the lowest value of 6 km is located at southern Taiwan and also has the highest thermal gradient of 88 ℃/km. The Curie point depth is consistent with heat-flow measurements with correlation coefficient 0.62.
机译：本研究构建了台湾及其附近地区的综合磁异常图，该图结合了陆地磁数据和海洋磁数据。极点还原（RTP）校正方法应用于整合的磁异常数据。校正后的磁异常结果在大约880 km的宽度和660 km的长度上与地质构造特征非常吻合，并用于估算居里点等温线。通过将空间数据变换到频域，所采用的居里点深度方法提供了磁异常的二维FFT功率谱与磁源深度之间的关系。磁源的基础深度是根据磁数据计算得出的。最后，获得台湾的居里点深度。最高值17 km位于台湾北部，最低值6 km位于台湾南部，并且具有最高的热梯度88℃/ km。居里点深度与相关系数为0.62的热流测量值一致。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第15期|26-33|共8页
  • 作者

    Hsien-Hsiang Hsieh; Chieh-Hung Chen; Pei-Ying Lin; Horng-Yuan Yen;

  • 作者单位

    Deportment of Earth Sciences, National Central University, Jhongli, Taiwan, ROC,Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan, ROC,Lamont-Doherty Earth Observatory, Columbia University, Palisades, USA;

    Department of Earth and Environmental Sciences, National Chung Cheng University, Chiayi, Taiwan, ROC;

    Lamont-Doherty Earth Observatory, Columbia University, Palisades, USA,School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA;

    Deportment of Earth Sciences, National Central University, Jhongli, Taiwan, ROC;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Magnetic anomaly; Curie point; Taiwan; Thermal gradient; Heat flow;

    机译：磁异常;居里点台湾;热梯度;热流;

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