摘要
尚义—隆化区域断裂呈近EW向分布于冀北地区,活动于新太古代晚期(阜平晚期),全新世至今仍有活动,探讨其形成与演化历史,对进一步研究冀北地区地质构造、矿产分布及新构造运动对人类活动的影响具有重要意义。通过统计该断裂中的构造岩及指向构造,发现尚义—隆化区域断裂为复杂的强变形带,韧性变形与脆性变形相间,具有长期及多期活动性、倾向及性质多变等特点;尚义—隆化区域断裂是冀北地区不同时段不同级别构造单元的重要分界线之一,对两侧地质历史的发展及演化具有重要的控制作用。根据构造叠置关系、糜棱岩类变质程度与区域变质作用的对应关系,以及剪切指向组构反映的活动方式与区域构造运动主应力的对应关系,重新厘定了构造叠加改造关系及变形期次,结合前人构造岩的变质矿物年龄,将该断裂划分为2个构造阶段、9个构造活动期。
Shangyi-Longhua regional fault was EW distributed near northern Hebei Province,which was first active in the Late Neoarchean(Late Fuping)and still active in the Holocene and even today.Therefore,exploring its formation and evolutionary history is of great significance to study its geological structure,mineral distribution and the influence of Neotectonic movement on human beings in northern Hebei Province.The regional faults in Shangyi-Longhua are strong complex deformation zones through the census of the tectonic rocks and all kinds of directional structures in the fault zone.The ductile deformation and brittle deformation are alternating with characters of chronicity,multiphase activity,propensity and nature variation.Shangyi-Longhua regional fault is one of the important dividing lines of tectonic units of different levels in different periods in northern Hebei Province,which plays an important role in controlling the development and evolution of geological history on both sides.The authors redefined the structure superposition transformation relation and the development period,according to the superimposed relationship of the sturcture,the corresponding relationship between metamorphic degree of mylonites and the regional metamorphism,and the corresponding relationship between the movement model reflected by the shear-pointed fabric and the principal stress of the regional tectonic movement.Combined with the metamorphic mineral age of the predecessor tectonites,the authors divided the fault structure into two construction phases and nine tectonic active periods.
作者
马超
王金贵
张鑫全
张子轩
李典
张新征
许凡
MA Chao;WANG Jingui;ZHANG Xinquan;ZHANG Zixuan;LI Dian;ZHANG Xinzheng;XU Fan(Regional Geology Survey Institute of Hebei Province, Langfang 065000, China)
出处
《中国地质调查》
2020年第5期88-94,共7页
Geological Survey of China
基金
中国地质调查局“河北省地质系列图件编制与综合研究(编号:1212010911013)”项目资助。
关键词
冀北
尚义—隆化区域断裂
叠加构造
演化历史
northern Hebei Province
Shangyi-Longhua regional fault
superposition sturcture evolutionary history
