The Dabie orogenic belt was the product of the long-term tectonic evolution and final collision between the North China plate and the Yangtze plate. The tectonic gneiss on the deep tectonic level of the crust developed in the northeastern Dabieshan. By restoring the stress field of the tectonic gneiss, it was considered that the northeastern Dabieshan was mainly affected by the two systems of NE-SW oriented Tethys tectonic system and NW-SE oriented Pacific tectonic system, rather than controlled by a single tectonic system. U-Pb isotopic dating of zircon LA-ICP-MS showed that there were at least three stages of tectonic events in the northeastern Dabieshan. The first stage was the magmatic activity at about 750±50 Ma, the second stage was the metamorphic activity at around 210±10 Ma and the third stage was the magmatic activity at about 130±5 Ma. The nearly horizontal E-W plastic rheology along the Dabieshan occurred in the late collision orogeny lead to the NWW-SEE direction of the gneissic schistosity and lineation in the Dabieshan. The time of the plastic rheology of the Dabie orogenic belt was about 210±10 Ma, and the Tan-Lu fault zone began at about 195±5 Ma, which reformed the original NWW-SEE direction structure of the Dabieshan, making the gneissic schistosity trend in the northeastern Dabieshan transformed toward NE direction change.
Li Hailong Song Chuanzhong Li Jiahao Ren Shenglian Wang Wei Li Zhenwei Yuanfang. The zircon U-Pb chronology analysis of the tectonic gneiss in the northeastern Dabieshan and its tectonic significance[J]. Chinese Journal of Geology, 2019, 54(3): 796-817.