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INTERMITTENTLY LATERAL TRANSFERRED RIFTING AND PROGRESSIVE- LEAPING INVERSION: A CASE STUDY FROM THE FUXIN BASIN

Wang Guiliang1, Ma Xingyuan2, Jing Huilin3, Yun Wu1, Wang Daqing1, Tan Haiqiao1, Li haiyu1   

  1. 1. College of Mineral Resources and Environment Sciences, China University of Mining and Technology; 2. Institute of Geology, State Seismological Bureau; 3. Changchu Institute of Coal Field Geology
  • Received:1996-09-20 Revised:1996-09-20 Online:1996-09-20 Published:1996-09-20

Abstract: The Fuxin fault basin is located on the western side of the uplifted core of Lushan anticline. Since Early Cretaceous intermediate volcanic rocks of the upper Yixian Formation had been accumulated in the graben defined by fault F”1 and fault F2 at the eastern and western margins respectively. After volcanic eruption ceased, terrestial clastic sediments of the Jiufutang Formation were then deposited in the F”1-F2 bounded graben. Following the early rifting, the crust in the areas tilted and uplifted, as a result, structural inversion initiated and deposition stopped in the southern part of the basin, the Yixian district. At the same time, the fault F2 at the western margin stopped its activities. During the Shahai episode, the basin evolved from a graben to a half-graben controlled by the fault F’1,with down-faulting at the eastern boundary and overlapping at the western boundary. As soon as the Shahai episode rifting ceased and the fault F”1 rested, the rifting of Fuxin episode occurred in the half-garben which had transferred eastwards and been controlled by the marginal fault F’1. After the Fuxin episode rifting ended, the basin undergone a leaping inversion, which many normal faults became the compound faults, namely, reserve fault at upper and normal ones at lower parts, and many positive flower structures were developed. The subsidence of Sunjiawan episode in Middle Cretaceous are further transferred eastward, and the half-graben defined by the fault F1 was formed. After the Sunjiawan episode, a basinwide uuplift and fold-fault took place, and finally the evolution history of the basin ended. The intermittently lateral-transferred rifting and progressive leaping inversion of the Fuxin basin provides a new tectonic models for basin inversion.