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首页> 外文会议>Proceedings of the 12th China International Geo-electromagnetic Induction Workshop >Three Dimensional Electrical Structure of the Crust and Upper Mantle of the Tibetan Plateau—Preliminary Results from SinoProbe Magnetotelluric Array Data
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Three Dimensional Electrical Structure of the Crust and Upper Mantle of the Tibetan Plateau—Preliminary Results from SinoProbe Magnetotelluric Array Data

机译：青藏高原地壳和上地幔的三维电学结构——SinoProbe大地电磁阵列数据的初步结果

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摘要

The on-going continent-continent collision between the Indian and Eurasian plates since ~55 Ma hasrncreated the spectacular topography of the Tibetan plateau. However, many first order questions remain to bernanswered as to the mechanisms behind this young orogenic process. Under the auspices of the SinoProbernProject, a three dimensional (3-D) Magnetotelluric (MT) array have been deployed on the Tibetan Plateaurnfrom 2010 to 2013 to better understand this orogeny. By the end of 2013, 1099 MT stations have beenrncompleted, including 102 combined broadband MT (BBMT) and long period MT (LMT) stations. In thisrnstudy, MT data of these 102 combined stations have been used to investigate the deep lithospheric electricalrnstructure of the Tibetan Plateau. MT impedances within the period range of 10 – 50000 s were extracted to bernused for 3-D inversions with the ModEM code using the standard NLCG algorithm. The resultingrnlithospheric electrical structure of the Tibetan Plateau shows a distinct pattern of strong variation not onlyrnvertically, but also horizontally. Conductors are found to be widespread in the middle to lower crust. But theirrngeometries are quite complex, and not obviously consistent with the hypothesis of continuous eastwardrnchannel flow. Instead, most crustal conductors in central and southern Tibet display a pattern of N-Srnextension. In the depth range of the upper mantle, two more conductive regions can be identified in thernsouthern Qiangtang Terrane and in the central Lhasa Terrane. Resistor associated with the underthrust Inidanrnplate can be traced beneath the Bangong-Nujiang suture in western Tibet, but only beneath the central Lhasarnterrane in central Tibet. As a next step in this study we will include more of the BBMT data in the 3-Drninversion to explore the crustal electrical structure in greater detail. Further efforts will also focus on testingrnthe reliability of deep structures, especially deep conductors, via forward modeling and constrained inversion.
机译：自约55 Ma以来，印度和欧亚大陆板块之间不断发生的大陆-大陆碰撞，创造了青藏高原的壮观地形。然而，关于这一年轻造山过程背后的机制，仍有许多一阶问题尚待解决。在SinoProbernProject的主持下，从2010年到2013年，在青藏高原部署了三维（3-D）大地电磁（MT）阵列，以更好地了解这一造山运动。截至2013年底，已完成1099个MT站，包括102个组合MT MT（BBMT）和长期MT（LMT）站。在这项研究中，这102个联合站的MT数据已用于调查青藏高原的深层岩石圈电结构。使用标准NLCG算法，使用ModEM代码提取10 – 50000 s范围内的MT阻抗，以进行3-D反转。所产生的青藏高原的岩石圈电结构不仅在垂直方向上而且在水平方向上都表现出明显的强烈变化模式。导体被发现广泛分布在地壳的中下部。但是它们的几何形状相当复杂，并且与连续的东向通道流动的假设显然不符。取而代之的是，西藏中部和南部的大多数地壳导体都表现出N-Srnextension模式。在上地幔的深度范围内，在南部的tang塘地带和中部拉萨地带可以识别出另外两个导电区域。与下推力Inidanrnplate相关的电阻器可以追溯到西藏西部的班公—怒江缝合线以下，但只能追溯到西藏中部的拉萨尔特拉纳中部。作为本研究的下一步，我们将在3-Drninversion中包含更多的BBMT数据，以更详细地研究地壳电结构。进一步的工作还将集中在通过正向建模和约束反演来测试深层结构（尤其是深层导体）的可靠性。

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  • 会议地点 Changsha(CN)
  • 作者

    Wenbo Wei; Letian Zhang; Gaofeng Ye; Sheng Jin; Jianen Jing; Hao Dong; Chengliang Xie; Yaotian Yin; Gang Wang; Zeqiu Guo;

  • 作者单位

    School of Geophysics and Information Technology, China University of Geosciences,Beijing 100083, China Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083, China;

    School of Geophysics and Information Technology, China University of Geosciences,Beijing 100083, China Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083, China;

    School of Geophysics and Information Technology, China University of Geosciences,Beijing 100083, China Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083, China;

    School of Geophysics and Information Technology, China University of Geosciences,Beijing 100083, China Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083, China;

    School of Geophysics and Information Technology, China University of Geosciences,Beijing 100083, China Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083, China;

    School of Geophysics and Information Technology, China University of Geosciences,Beijing 100083, China Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083, China;

    School of Geophysics and Information Technology, China University of Geosciences,Beijing 100083, China Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083, China;

    School of Geophysics and Information Technology, China University of Geosciences,Beijing 100083, China Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083, China;

    School of Geophysics and Information Technology, China University of Geosciences,Beijing 100083, China Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083, China;

    School of Geophysics and Information Technology, China University of Geosciences,Beijing 100083, China Key Laboratory of Geo-detection of Ministry of Education, Beijing 100083, China;

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