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双帚状断层的成因和生长发育
李理1,2, 时秀朋1,3, 胡秋媛1,4, 陈衍1,2
作者单位
李理1,2, 时秀朋1,3, 胡秋媛1,4, 陈衍1,2 1. 中国石油大学地球科学与技术学院, 山东青岛 266580
2. 海洋国家实验室海洋矿产资源评价与探测技术功能实验室, 山东青岛 266071
3. 中国石化胜利油田分公司勘探开发研究院西部分院, 山东东营 257000
4. 中国石油大学胜利学院, 山东东营 257061 
摘要:
通过几何学、运动学和成因分析及物理模拟试验,对渤海湾盆地临南洼陷双帚状断层的成因及演化进行研究。结果表明:夏口断层为东端收敛、西端撒开的张剪帚状断层,早白垩世受伸展与右行走滑作用产生,新生代受伸展叠加走滑作用继续发育成为条走滑-正断层,临邑"帚状断层"西敛东撒,为新生代正向以及斜向伸展叠加走滑的产物,其撒开端与收敛端级别相同而非次级断层;双帚状断层出现在古新世-早始新世,活动强度由收敛端向撒开端迁移,即夏口断层由西向东迁移,临邑断层由东向西变强,并在渐新世后超过了夏口断层直到上新世;早白垩世以来区域构造应力场的变化、兰聊断层的走滑作用及鲁西隆起新生代的抬升是控制双帚状断层形成和发育的根本因素。
关键词:  帚状构造  物理模拟  中-新生代  渤海湾盆地
DOI:10.3969/j.issn.1673-5005.2017.06.005
分类号:
基金项目:国家自然科学基金项目(41672193)
Mechanism and growth of broom-like faults
LI Li1,2, SHI Xiupeng1,3, HU Qiuyuan1,4, CHEN Yan1,2
Abstract:
The formation and evolution of the double broom-like faults in Lin'nan sag of Bohai Bay Basin were studied by using geometrical, kinematic and genetic analyses and analogue modeling. The results are as follows:Xiakou fault is a tensional-shear broom-like fault mainly formed by the extension and dextral strike slip faulting in the early Cretaceous, in which the fault plan converged at the eastern end and opened at the western end. The fault continued to develop in the Cenozoic by extension and dextral strike slipping to form a strike slip-normal fault. Linyi fault is a normal fault with a "broom-shaped" west end bunching and an eastern end opening, which was formed by the Cenozoic orthodox and oblique extension. The opening end and the converging ends of the fault are at the same fault level. The double-broom-like fault appeared in the Paleocene/Early Eocene, and the faulting activity intensifies from the convergent end to the opening end, resulting in a strong western end of Linyi fault and a strong eastern end of Xiakou fault. The intensity of fault activity of Linyi fault is greater than that of Xiakou fault in the Oligocene until the Pliocene. The strike-slip faulting of Langliao fault, the regional tectonic stress field since the Early Cretaceous, and the Cenozoic uplifting of Luxi uplift were the fundamental controlling factors of the formation and development of the double-broom fault.
Key words:  broom-like structure  analogue modeling  Meso-Cenozoic  Bohai Bay Basin
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