Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (2): 584-596.doi: 10.13278/j.cnki.jjuese.20200016

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Near-Surface Fine Velocity Structure in Eastern Segment of Central Asian Orogenic Belt: Revealed by First-Arrival Wave Tomography from Deep Seismic Reflection Profile

Xie Fan1, Wang Haiyan2, Hou Hesheng3, Gao Rui1,2,3,4   

  1. 1. School of Earth Science and Geological Engineering, Sun Yat-Sen University, Guangzhou 510275, China;
    2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;
    3. Chinese Academy of Geological Sciences, Beijing 100037, China;
    4. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2020-01-01 Published:2021-04-06
  • Supported by:
    Supported by the National Natural Science Foundation of China (41430213,41590863),the National Key R&D Program of China (2107YFC0601301, 2107YFC0601300) and the Project of China Geological Survey (DD20160207,DD20190010)

Abstract: To reveal the superficial structure of the Central Asian orogenic belt, provide precise constraints on the evolution and deep processes of the crust, a fine model of near-surface velocity structure with a thickness about 3 000 m was obtained through the first-arrive wave tomography based on a total of 2 186 shots across a 400 km long deep seismic reflection profile in the eastern section of the Central Asian orogenic belt (Naiman Banner-East Wuzhumuqin Banner). This model calculated the variation of sedimentary thickness and the bedrock undulation, and the scale and thickness of the forearc basin with low-velocity characteristics were obtained near the Hegen Mountain suture zone and Xar Moron suture zone. Based on the near-surface velocity structure and the strong amplitude reflection information of the deep seismic reflection profile, a structure model was inferred that coincides with the bidirectional subduction of the paleo-Asian Ocean on the north and south sides of the profile and merges with the residual microcontinent block in the middle. The results showed the deposition thickness varies from 0.3 to 3.0 km, there were multi-periodic magmatic and tectonic activities in the study area, and the buried and continuous high velocity structures in Linxi area are mostly caused by orogenic granites. Through our work, the subduction process of the paleo-Asian Ocean can still be traced in the near-surface velocity structure of the continental margin after hundreds of millions of years of evolution.

Key words: Central Asian orogenic belt, near-surface velocity structure, deep seismic reflection profile, first arrival travel-time tomography

CLC Number: 

  • P631.4
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