太行山东缘断裂南支断层性质及断层泥K-Ar同位素定年  

The character of southern branch fault in eastern marginal fault zone of Taihang Mountain and K-Ar dating of fault gouge

作　　者：闫淑玉[1] 张进江[1] 王晓先[1] 卢丹[1] 王丽斌[1] 

机构地区：[1]北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室,北京100871

出　　处：《地质科学》2012年第1期1-12,共12页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：全国油气资源战略选区调查与评价国家专项"华北上古生界油气资源战略选区项目"(编号:2009GYXQ17)资助

摘　　要：太行山东缘断裂是华北盆地西边界的控制性断裂,对研究华北盆地中-新生代油气藏、地震分布及成矿作用具有重要意义。通过对太行山东缘断裂南支断层几何学、运动学的详细研究以及对断层泥的X射线衍射分析、K-Ar同位素年代学研究,确定了太行山东缘断裂为枢纽性质正断层,山一系列北北东走向正断层组成,呈左阶阶梯状展布,断层活动时间为113.42±2.31 Ma。断裂在新生代再次活动,形成多幕式的断陷盆地。Eastern marginal fault zone of Taihang Mountain is a controlling fault in western marginal of north China Basin,as it has a great meaning to oil-gas reservoir,distribution of earthquake and mineralization since Mesozoic.On basis of detailed research of geometry,kinematics,XRD of fault gouge and K-Ar isotope chronology,we confirmed that the fault zone was a normal and hinge fault,which is composed of a series of normal faults trending NNE.In the longitudinal,it presents left-lateral.The K-Ar dating of syntectonic illite showed that the fault deformed intensely during the time of 113.42±2.31 Ma.Reactivated during Cenozoic,the fault has formed a series of rift basins.

关 键 词：太行山东缘断裂 断层泥 K-AR年龄 枢纽正断层 

分 类 号：P542[天文地球—构造地质学] P588[天文地球—地质学]