河北良岗紫荆关断裂带特征研究

Study on the Characteristics of Zijingguan Fault Zone in Lianggang,Hebei Province

紫荆关断裂带系属太行山深大断裂,长期以来是华北地区地质构造研究的热点。在充分研究前人成果和区域地质背景的基础上结合研究区实际,从紫荆关断裂带在良岗地区的地质、遥感、重力、航磁等多个维度入手,总结了其在研究区内地表及深部基本地质特征,较系统地分析了其自新太古代至新生代的多期活动特性,并相应的浅析了其运动学、动力学特征。研究区紫荆关断裂带整体上表现为北东向正断层,规模宏大,深切莫霍面。早在新太古代—古元古代期间该断裂带可能已具有一定的规模,古元古代进一步形成和发展,古生代未有明显活动,中生代侏罗纪—白垩纪为强烈变形阶段,新生代期间继承性活动。

Zijingguan fault zone system belongs to Taihang mountain deep fault,which has long been the focus of geological structure research in North China.Based on the full study of previous achievements and regional geological background,combined with the reality of the study area,starting from the geology,remote sensing,gravity,aeromagnetism and other dimensions of Zijingguan fault zone in Lianggang area,this paper summarizes its surface and deep basic geological characteristics in the study area,systematically analyze its multi-stage activity characteristics from Neoarchean to Cenozoic,and analyzes its kinematics and dynamics characteristics accordingly.On the whole,Zijingguan fault zone in the study area is a NE trending normal fault,with a large scale and deep Moho surface.As early as the Neoarchean Paleoproterozoic period,the fault zone may have a certain scale.The Paleoproterozoic has further formed and developed.There is no obvious activity in the Paleozoic that the Jurassic Cretaceous period in the Mesozoic is a strong deformation stage and the inherited activity during the Cenozoic.