摘要
龙泉关韧性剪切带位于五台山花岗岩－绿岩地体与阜平高级变质地体的接触部位，它不仅改造了“阜平群”，而且也改造了“五台群”。宏观构造、显微组构和矿物组合研究表明，龙泉关韧性剪切带经历了两期变形作用。早期发生于恒山古陆块－车厂弧地质体－阜平古陆块碰撞过程中，形成低角度逆冲型韧性剪切带，使地壳显著增厚。晚期发生于增厚地壳的纵向伸展过程中，使地壳得以均衡发展，形成低角度伸展型韧性剪切带。龙泉关韧性剪切带的变形特征反映了五台山晚太古代碰撞造山带的构造演化。
Longquanguan ductile shear zone(DSZ)is situated in the contact of Wutaishan granite-greenstone terrain and Fuping high-grade metamorphic terrain.It transformed not only the “Fuping group”,but also the “Wutai group”.The studies of macrostructure, microtexture and mineral assenblages show that Longquanguan DSZ underwent two stages of deformation.The early stage deformation occured in the collision of Hengshan terrain-Chechang island are-Fuping terrrain,and formed a low angle reversal DSZ,which led the crust to thicken obviously. The later stage deformation occured in the large scale logitudinal extention of the remarkable thickening crust,which led the crust to develop balancedly and formed a low angle extention DSZ.The deformation characteristics of Longquanguan DSZ reflect the tectonic evolution of the late Archaean collision orogenic belt in Wutaishan area.
基金
地矿部定向基金
第30届国际地质大会野外考察路线项目
