Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (4): 1132-1141.doi: 10.13278/j.cnki.jjuese.201504116

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Structural Evolution and Dislocation Mechanism of Western Margin Chepaizi Uplift of Junggar Basin

Dong Dawei1, Li Li1, Wang Xiaolei2, Zhao Li1   

  1. 1. School of Geosciences, China University of Petroleum, Qingdao 266555, Shandong, China;
    2. Oil Production Plant of Dongxin, Shengli Oilfield Company, Sinopec, Dongying 257061, Shandong, China
  • Received:2014-11-20 Published:2015-07-26

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Abstract:

Depending on the geographical background, the author discusses the structural evolution combined with the present static structural description. The features of geometry and kinematics of Chepaizi uplift are analyzed, as well as its structural evolution process. The different types of dislocation mechanisms are studied for their structural evolution. The results show that there were two fault systems developed on Chepaizi uplift, namely the reverse fault of Carboniferous-Cretaceous formed during Haixi-India period,and the normal fault of Cretaceous-Third system formed in Himalayan period. The structural evolution of Chepaizi uplift can be divided into three periods: C3-J, K-E, and N-Q. The structural stress background of the three periods have some differences. This resulted in the significant differences of the fault systems and their geographical depths. In the stage of C3-J, located in the eastward nappe thrust fold belt, Chepaizi uplift thrust into the east thrust Hongche fault belt without stratigraphic deposition.In the stage of K-E, due to the right-handed rotary pressing and twisting of the Hongche fault belt, Chepaizi salient was pressed onto the top belt of the thrust wedge from the northeast direction. Some of the earlier thrust faults developed successively and sustainably, and some of them stopped developing, while some others developed intermittently and formed a blind thrust. The stratum layouts from northeast to northwest in this period.In the stage of N-Q, due to the northward pressing and uplifting of North Mount Tianshan, Chepaizi salient was pushed into the front uplift belt, and resulted in the occurrence of the negative reversal to some thrust faults. A plenty of normal faults were developed in the stage of N-Q. Affected by the southward inclining salient, the stratum presents thick in the south and thin in the north.

Key words: Junggar basin, Chepaizi uplift, Hongche fault zone, fault, fault development mechanism

CLC Number: 

  • P542

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