冀东冷口断裂中生代以来的构造活动及其地质意义  

TECTONIC ACTIVITY OF THE LENGKOU FAULT IN EASTERN HEBEI SINCE THE MESOZOIC AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：陈云峰[1] 王根厚[1] 张长厚[1] 秦渊[1] 穆胜利[1] 刘阳[1] 

机构地区：[1]中国地质大学,北京100083

出　　处：《地质力学学报》2005年第4期341-349,共9页Journal of Geomechanics

基　　金：国家自然科学基金项目(49802019和49702034);中国地质调查局125万青龙幅区域地质调查项目(编号:2001300005141)的成果

摘　　要：冷口断裂在区域上整体构造格架以EW向和NNE向占主导地位的情况下,其构造线方向却为NW向。在对冷口断裂进行了详细的野外追踪的基础上,结合前人区域上的研究成果,认为冷口断裂是多期构造活动的产物,控制了中元古界的沉积。中生代以来断裂活动分为四期:①中侏罗世早期由南向北逆冲;②中侏罗世末—早白垩世正—左行走滑;③晚白垩世由北向南逆冲;④后期右行走滑。While regionally the whole tectonic framework of the Yanshan intraplate orogenic belt is oriented in E-W and NNE directions, the tectonic line of the Lengkou fault strikes NW. On the basis of detailed field tracing of the Lengkou fault, combined with previous regional research results, the authors hold that the Lengkou fault resulted from polyphase tectonic activities and controlled Mesoproterozoic deposits. The fault activities since the Mesozoic may be divided into four phases： 1. north-vergent thrusting in the early Middle Jurassic; 2. normal-sinistral strike-slip movement in the terminal Middle Jurassic to Early Cretaceous; 3. south-directed thrusting in the Late Cretaceous; and 4. dextral strike-slip movement in the late phase.

关 键 词：冀东地区 冷口断裂 燕山板内造山带 正—左行走滑 

分 类 号：P542[天文地球—构造地质学]