关于大别运动的新认识

本文依据红安群（宿松群）和大别山杂岩在岩石建造和变形、变质改造等方面的重大差异以及其间残存的角度不整合面，进一步肯定了大别运动的存在。大别运动主要发生时间为２５００Ｍａ左右，区域上大致可与华北地台阜平运动对比，是大别山地区原始硅铝质陆壳形成和韧性再造的变革运动。初步将大别旋回划分出早期伸展、中期挤压和晚期走滑剪切３个变形幕。指出了大别运动界面是大别山上部地壳极其重要的滑脱界面和层圈构造，沿袭这一古老构造薄弱面曾先后发生了韧性滑覆、脆－韧性逆冲推覆和脆性剥离等变形事件。

The New Recognition about the Dabie Movement

According to the difference between the Hongan Group or Susong Group and the Dabieshan Complexes in formation, deformation and metamorphism, and the remnant angular unconformity between them, it is further affirmed to exist the Dabie movement. The movement,which took place in 2500 Ma and may be regionally compere with the Fuping movement in North China platform, is a revolutionary movement for the formation of original sialspheric crust and ductile reconstruction in the Dabieshan region. The Dabie cycle is initially divided intO three deformation events of early extension,middle compression and fate strike-slip shearing. It is pointed out that the boundary plane of the Dabie movement is a very imporbot detachment plane and bread-crust structure in the upper cruSt of the Dabieshan region and afterwards underwent the deformation events of ductile slipping,brittle-ductile thrust and brittle detachment later on.