太行山南段自立庄韧性剪切带变形特征  

Deformation Characteristics of the Zilizhuang Ductile Shear Zone in the Southern Taihang Mountains

作　　者：张祥信 刘冀莱 苏俸可 崔正坤 陈艺竹 ZHANG Xiangxin;LIU Jilai;SU Fengke;CUI Zhengkun;CHEN Yizhu(Hebei Key Laboratory of Strategic Critical Mineral Resources,Hebei GEO University,Shijiazhuang,Hebei 050031;College of Earth Sciences,Hebei GEO University,Shijiazhuang,Hebei 050031;Key Laboratory of Regional Geology and Mineralization,Hebei GEO University,Shijiazhuang,Hebei 050031)

机构地区：[1]河北省战略性关键矿产资源重点实验室,河北石家庄050031 [2]河北地质大学地球科学学院,河北石家庄050031 [3]河北地质大学区域地质与成矿作用重点实验室,河北石家庄050031

出　　处：《地质与勘探》2021年第1期166-174,共9页Geology and Exploration

基　　金：河北省教育厅项目(编号:BJ2019015、2017CXCY098)资助。

摘　　要：太行山南段临城自立庄地区古元古界甘陶河群中低级变质岩中发育一条左行逆冲型韧性剪切带。自立庄韧性剪切带出露长约10 km,宽约1 km,走向NNE,往西缓倾,在EW方向上由若干条强变形带与其间的弱变形域或岩块组成,平面上呈现平行式的组合特征。该韧性剪切带内发育糜棱岩、拉伸线理和皱纹线理、不对称褶皱、石香肠构造和构造透镜体、S-C面理和旋转碎斑等宏观和微观构造。S-C面理、旋转碎斑、不对称褶皱等宏微观变形特征一致表明自立庄韧性剪切带上盘由西往东逆冲的运动学性质。在对韧性剪切带宏观、微观构造特征研究基础上,结合区域资料,认为自立庄韧性剪切带的形成与华北克拉通古元古代末期西部陆块与东部陆块的EW向碰撞拼合有关,是18.5 Ga吕梁运动的产物。自立庄韧性剪切带的厘定为太行山南段古元古代构造演化提供了基础资料。A sinistral thrust ductile shear zone was recognized in the Zilizhuang area of Lincheng County,southern Taihang Mountains,which developed in the middle-low-degree metamorphic rocks from the Gantaohe Group.The Zilizhuang ductile shear zone consists of several strong deformation zones and intervening weak deformation domains or rock masses,dipping gently westward and striking in NNE direction,with a length of ca.10 km and a width of ca.1 km.Its deformation zones are nearly parallel to each other.In this ductile zone,there exist many typical macroscopic and microscopic structures,such as mylonite rocks,stretching and crenulation lineations,asymmetrical folds,boudinages and structural lenses,S-C foliations and rotational porphyroclasts.These kinematic markers such as S-C foliations,rotational porphyroclasts and asymmetrical folds suggest thrusting from west to east of the hanging wall of this ductile shear zone.The macroscopic and microscopic structures together with regional geological data suggest that the Zilizhuang ductile shear zone resulted from the E-W collision between the Eastern Block and the Western Block of the North China Craton during an 18.5 Ga tectonic movement,i.e.,the Lüliang Movement.Thus,the determination of the Zilizhuang ductile shear zone provides constraints on the Paleoproterozoic tectonic evolution of the southern Taihang Mountains.

关 键 词：韧性剪切带 古元古代 吕梁运动 自立庄 太行山南段 

分 类 号：P583[天文地球—岩石学] P597[天文地球—地质学]