内蒙古固阳下湿壕-武川酒馆韧性剪切带的大地构造意义探讨

固阳-武川韧性剪切带的大地构造意义及金的含矿性一直倍受科研和勘查部门的关注，许多学者曾从不同角度或以不同研究方法对其进行过论述。作者通过附近部分地区的详细地质填图研究，对其大地构造意义赋予新的内涵，认为该剪切带是相互分离的两个古陆块在晚太古代末一早元古代初碰撞拼贴的基础上，经早元古代中晚期近东西向左旋剪切改造的接触界线，色尔腾山岩群和乌拉山岩群是晚太古代不同大地构造环境的产物。

ON THE TECTIONIC IMPLICATION FOR XIASHIHAO-JIUGUAN DUCTILE SHEAR ZONE IN GUYANG-WUCHUAN AREA,INNER MONGOLIA

A lafge ductile shear zone about E-W developed in Guyang-Wuchuan area, Inner Mongolia has been paid attention by goologists, which is thought as a important tectonic boundary. By the new regional gtheical mapping and research, its tectonic imPlication has been modified. It is considered as a amalgarnted toundary between two old microcontienet block during the end of Neoarchean to Palaooproterozoic. The petrotectonic assemiblages and geochemical evidence has indicated that Neoarchean Se'ertengshan Group may be formed in an active continent margin (an arc-related setting), which distributed in the west-southern margin of the north old microconinent block. The Wulashan Group may be formed in the east-northern stable margin of the south old microcontinent block, which was limited to upper Archean by isotope age and thelogical arid structral features. During last stage of Nooarchean, subduction of the oceanic crust toward north microcontinent block brought ahaut Se'ertengshan Group orogenic uplift at the greenschist-axnphibol ite facies. In first stage of Palaeoproterosoic, following the oceanic crust disappeared, Wulashan Group underthrusted into Se'ertengshan Group and resulted in widespred granulite facies metamorphism. Owing to the E-W sinistral reverse-slip shearing,the primitive amalgamated boundary orientation approximately NW-SE changed to about E-W during middle-later stage of Palaeoproterosoic.