Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (5): 637-643.doi: 10.11743/ogg20060508

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Discovery and timing of major thrustbelt in Jiamusi-Yitong fault zone

Sun Xiaomeng1, Long Shengxiang2, Zhang Meisheng1, Liu Xiaoyan1, Hao Fujiang3   

  1. 1. College of Geosciences, Jilin University, Changchun, Jilin 130022;
    2. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083;
    3. College of Applied Technology, Jilin University, Changchun, Jilin 130022
  • Received:2006-04-20 Online:2006-10-25 Published:2012-01-16

Abstract:

The newly discovered major thrustbelt in the Jiamusi-Yitong fault zone in Siping city of Jilin province has well developed thrusts,cataclasite,and folds.In areas near the eastern and western main boundary faults, secondary faults are distributed intensively,and folds are dominated by closed vertical bends,while in the central part of the thrustbelt,the strata occurrence is gentle with few faults and folds,indicating that the main boundary faults are the area of compressive stress concentration.Most of the faults thrust towards the 110°-130° irection.According to the relationship of cutting and overlaying between the thrusts and the Mesozoic-Cenozoic strata,the Jiamusi-Yitong fault zone is considered to have experienced at least two periods of strong obduction since the Cretaceous:the first occurred in late Late Cretaceous,when the major thrustbelt was formed;and the second occurred at the end of Oligocene.According to field survey results and basin data,the formation and evolution of Jiamusi-Yitong fault zone can be divided into five stages:namely sinistral strike-slip(early K1),regional stretch(later K1-early K2),compressive and thrusting(late K2),fault depression(E),and compressive inversion(the end of E3).

Key words: thrust fault, Late Cretaceous, Jiamusi-Yitong fault zone, northeastern China

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