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间歇侧移式的裂陷与递进跳跃式的反转

王桂梁 马杏垣 荆惠林 云武 王大庆 谭海憔 李海玉   

  1. 中国矿业大学资源环境学院
  • 收稿日期:1996-09-20 修回日期:1996-09-20 出版日期:1996-09-20 发布日期:1996-09-20

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

摘要: 位于闾山背斜隆起核部西侧的阜新断陷盆地从早白垩世义县组晚期开始,在东西两侧盆 的F1、F2断层所、围限的地堑内接受了义县组上部中性火山岩的堆积。火山喷发停止后,九佛堂组的大陆碎屑冉建造仍在F1和F2断层之间的地堑内充填。九佛堂裂陷期之后该区地壳掀斜隆升,盆地南侧的义县地区开始反转抬升而不再接受沉积,西缘的F2断层也停止活动,到沙海组充填时盆地已演化为受F1断层控制的、东断西超的半地堑盆地;沙海期裂陷终止后F1断层停止活动,阜新组裂陷是在向东移的F1盆缘断层控制下半地堑内发育的。阜新期裂陷结束后盆地又发生了一次跳跃式的反转,许多断层发育成了逆正的复合断层,井出现正花状构造。中白垩世孙宗湾组的沉陷进一步向东侧移,形成了以F1断层为盆缘断层的半地堑;孙家湾期后发生本区最强烈的整体反转、隆升和褶断,结束了盆地的演化历史。阜新期盆地间歇侧移式的裂陷递进跳跃式的反转为盆地反转建立一个新的构造模式。

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.