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    Volume 46 Issue 5
    May  2021
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    Article Navigation >  Earth Science  > 2021  >  46(5): 1737-1748
    Yu Mingyu, Yu Changqing, Qu Chen, Wang Qi, Zeng Xiangzhi, Tian Zhenyu, Zheng Xiaojie, 2021. Deep Structural Characteristics of Pengguan Complex in Longmenshan Fault Zone Derived from Seismic Reflective Profile. Earth Science, 46(5): 1737-1748. doi: 10.3799/dqkx.2020.020
    Citation: Yu Mingyu, Yu Changqing, Qu Chen, Wang Qi, Zeng Xiangzhi, Tian Zhenyu, Zheng Xiaojie, 2021. Deep Structural Characteristics of Pengguan Complex in Longmenshan Fault Zone Derived from Seismic Reflective Profile. Earth Science, 46(5): 1737-1748. doi: 10.3799/dqkx.2020.020
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    Deep Structural Characteristics of Pengguan Complex in Longmenshan Fault Zone Derived from Seismic Reflective Profile

    doi: 10.3799/dqkx.2020.020
    • 1.

      Hubei Key Laboratory of Subsurface Multi-Scale Imaging, China University of Geosciences, Wuhan 430074, China

    • 2.

      Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

    • 3.

      PetroChina Oriental Geophysical Company, Zhuozhou 072750, China

    • 4.

      Institute of Geophysics & Geomatics, China University of Geosciences, Beijing 100083, China

    • Received Date: 2020-06-11
    • Publish Date: 2021-05-15
      Abstract
    • Pengguan complex is located in the middle part of Longmenshan fault zone, which is an important part of Longmenshan regional tectonics. In this paper, the deep seismic reflection profile through the long axis of Pengguan complex is analyzed and interpreted, and the deep structural characteristics and formation mechanism of Pengguan complex are described. The analysis of seismic reflection profile shows that Pengguan complex is stratified in depth, with a bottom interface, and Pengguan complex shows rootless characteristics. Based on the analysis of its structural characteristics, it can be inferred that the in-situ rocks come from deeper and more western locations. The development of faults in the shallow part of Pengguan complex is consistent with the surface fault system of Longmenshan Mountain, which indicates that the diagenesis time of Pengguan complex is earlier than that of Longmenshan tectonic movement. At the same time, the Yingxiu-Beichuan fault in the deep part of the section energy map develops stratified gaps in different stages of Pengguan complex rock mass, which means it did not destroy the deep structure of Pengguan complex main rock mass. Referring to lithology and diagenetic time, it is inferred that Pengguan complex originated from the Songpan block basement material which was upwelled by compression during the Indosinian movement, the basement magma upwelled several times during the plate movement, and was uplifted by stress nappe in the northwest direction during the Himalayan movement to its present position.

       

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    • 致谢: 感谢本文编辑和审稿专家针对本文提出的建设性意见和建议，感谢中国地质科学院地质研究所李海兵研究员、崔君文研究员以及中国地震局赤峰地震台冯杨洋在本文研究过程中给予的指导和帮助，特此致谢！
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