冀中坳陷的伸展构造系统及其构造背景

冀中坳陷主要发育在古近纪,是渤海湾盆地西北部的一个典型的半地堑群,以发育古潜山油气藏著称于世。本文在地震剖面分析基础上,建立了冀中坳陷的伸展构造系统。该系统以大兴、保定—石家庄拆离滑脱断层为主体,与牛东—河东、马西、宁晋、新河等伸展断层以及徐水—安新变换带和衡水、宝坻—桐柏镇变换断层等组合而成。最后,探讨了伸展构造系统发育的深部构造背景及其与太行山变质核杂岩之间成因上可能的联系。

EXTENSIONAL TECTONIC SYSTEM AND ITS DEEP-SEATED SETTING OF JIZHONG BASIN, CHINA

The Jizhong basin is one of the half-g raben group in the northwestern Bohai Bay basin,mostly developed in the Paleogene,and is fa mous for its buried hill-type hydrocarbon accumulation.Based on the seismic sections,the intra-basinal structure features was documented,and an extensional structural system was suggested.The system was made up of Daxing,Baoding-Shijiazhuang detachment faults,east Niu-tuozhen-east Hexiwu,west Nanmazhu ang,Ningjin,Xinhe extensional fau lts and Hengshui,Baodi-Tongbaizhen transfer faults and /or Xushui-Anxin transfer zones.Finally,the deep-seated setting of the Jizhong basin development as well as its relationship with Taihang mountains metamorp hic core complexes was discussed.