论河北省兴隆一带东西向走滑断裂系统

河北省兴隆县一带地处燕山造山带的中段，是中生代构造变形的典型地区。该区广泛发育了东西向和北东向联合构造，东西向主走滑断裂呈右行右阶式（Ｐ断裂），北东向次级构造由北盘的雁列式褶皱、分枝断裂及南盘次级断裂等组成。燕山台褶带变形是由尚义─平泉断裂和密云─洪山口断裂在侏罗纪时发生右行走滑形成的，其间的剪切变形带，总体特征类似于一个大型Ｓ─Ｃ构造或平面对冲构造。区内古基底断裂不仅控制中晚元古代的沉积地层和岩浆活动，而且对中生代的构造变形方式也产生重要作用。主走滑断裂与古基底断裂的复活有直接的关系

THE E W TRENDING STRIKE SLIP FAULT SYSTEM IN XINGLONG, HEBEI

The Xinglong area, Hebei province, is tectonically located in the central sector of the Yanshan orogenic belt. A conjugate structure formed by intersection of the E W and NE structures is widely developed in the area. Study suggests that the E W trending principal strike slip fault displays a dextral step pattern (P fault), while the NE trending subsidiary structure is composed of en echelon folds and branching faults in the north block and subsidiary faults in the south block. The chief deformation in the Yanshanian platform fold belt resulted from dextral strike slip of the Shangyi Pingquan fault and Miyun Hongshankou fault during the Jurassic, and the shear zone between them generally resembles a large scale S C structure or plane ramp structure. The ancient basement fault in the area not only controlled the Middle Late Proterozoic sedimentation and magmatism, but also played an important role in the occurrence of the mode of Mesozoic tectonic deformation. The formation of the principal strike slip fault was directly related to the rejuvenation of the ancient basement fault.