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Lithospheric Electrical Structure across the Eastern Segment of the Altyn Tagh Fault on the Northern Margin of the Tibetan Plateau
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This work was supported by grants from the National Natural Science Foundation of China (General Program No. 40974058), National Science Fund for Distinguished Young Scholars (No. 40904025 and 41404060), and Fundamental Research Funds for the Central Universities (2652014016). We would like to thank the National Natural Science Foundation of China, United States National Science Foundation, Science Foundation of Ireland (award 08/RFP/GEO1693 to AGJ), and Natural Science and Engineering Research Council (Canada) for financial support.

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    Abstract:

    Project INDEPTH (InterNational DEep Profiling of Tibet and the Himalaya) is an interdisciplinary program designed to develop a better understanding of deep structures and mechanics of the Tibetan Plateau. As a component of magnetotelluric (MT) work in the 4th phase of the project, MT data were collected along a profile that crosses the eastern segment of the Altyn Tagh fault on the northern margin of the plateau. Time series data processing used robust algorithms to give high quality responses. Dimensionality analysis showed that 2D approach is only valid for the northern section of the profile. Consequently, 2D inversions were only conducted for the northern section, and 3D inversions were conducted on MT data from the whole profile. From the 2D inversion model, the eastern segment of the Altyn Tagh fault only appears as a crustal structure, which suggests accommodation of strike slip motion along the Altyn Tagh fault by thrusting within the Qilian block. A large-scale off-profile conductor within the mid-lower crust of the Qilian block was revealed from the 3D inversion model, which is probably correlated with the North Qaidam thrust belt. Furthermore, the unconnected conductors from the 3D inversion model indicate that deformations in the study area are generally localized.

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ZHANG Letian, YE Gaofeng, JIN Sheng, WEI Wenbo, Martyn UNSWORTH, Alan G. JONES, JING Jianen, DONG Hao, XIE Chengliang, Florian LE PAPE, Jan VOZAR.2015. Lithospheric Electrical Structure across the Eastern Segment of the Altyn Tagh Fault on the Northern Margin of the Tibetan Plateau[J]. Acta Geologica Sinica(),89(1):90-104

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History
  • Received:February 11,2014
  • Revised:September 24,2014
  • Online: February 12,2015
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