Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (6): 1837-1846.doi: 10.13278/j.cnki.jjuese.201606302

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Deep Electrical Structure of Jinxian-Zherong Magnetotelluric Profile in South China

Han Song1, Liu Guoxing1,2, Han Jiangtao1,2   

  1. 1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;
    2. Key Laboratory of Applied Geophysics, Ministry of Land and Resources, Changchun 130026, China
  • Received:2016-02-07 Online:2016-11-26 Published:2016-11-26
  • Supported by:
    Supported by the Deep Exploration in China (SinoProbe-02) and the National Natural Science Foundation of China(41504076)

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Abstract: In order to study the deep electrical structure in south China,and explore the deep background of the surface geological process, we have accomplished a long-period magnetotelluric profile from Jinxian, Jiangxi to Zherong, Fujian. Based on the data processing, 2D qualitative analysis and 2D inversion, the lithospheric electrical structure model was finally obtained. The electrical structure of four tectonic regions and major faults were analyzed. The inversion model reveals:1) the profile can be divided into four tectonic regions,which are the Jiangnan orogen, the Cathaysia interior, the Cathaysia folded belt and the Southeast coast magmatic belt, respectively. 2) Two electrical Moho uplifts were found in Mount Wuyi and the Southeast coast magmatic belt, and the electrical Moho was controlled by major faults. 3) The lithosphere thickness of the profile gets thinning from east to west on the whole. The thickness of the lithosphere asthenosphere boundary of Jiangnan orogen varies from 80 to 100 km, the thickness of the lithosphere-asthenosphere boundary of Cathaysia folded belt and the Southeast coast magmatic belt is about 140 km. There exists one lithosphere thinning region and two asthenophere upwelling areas, which reflects the nonuniform reform of the lithosphere under the tectonic extension process.

Key words: magnetotelluric, lithospheric electrical structure, Moho, lithosphere-asthenosphere boundary (LAB)

CLC Number: 

  • P631.3
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