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晋冀内蒙古交界区出露有我国少有的、以麻粒岩相岩石为代表的太古宙下地壳。对该区的区域构造及变形变质作用研究表明,本区经历了2期主要的变形变质作用事件,在张宣地区保存有较好的早期近东西向的构造,从北至南(恒山变质地体)的地质构造特征揭示其可能为一出露的太古宙下地壳剖面。其后期在大同地区又被NE—SW向的高温韧性剪切带叠加,此叠加变形事件改造了本区太古宙的层序。 从国外近20年研究看,大陆地壳剖面的研究具十分重要意义:①大陆地壳剖面的建立,可以进行全球范围内不同时、空
Inner Mongolia Jin Ji junction area exposed rare in our country, granulite facies rocks represented by the Archean crust. The research on the regional tectonics and metamorphism and metamorphism shows that there are two main deformation and metamorphic events in this area, and there is a good early-near-west tectonic structure in Zhangxuan area. From north to south (Hengshan metamorphic The geotectonic features of this body reveal that it may be an exposed Archean crust section. The later period was superimposed by the NE-SW ductile shear zone in the Datong area. This superimposed deformation event transformed the Archean sequence in this area. From the past 20 years of foreign studies, the study of the continental crust profile is of great significance: ① The establishment of the continental crust profile can be carried out at different time and space