对大别造山带折返过程的认识，仍然存在着较大分歧。尤其是对大别造山带南部的折返作用，长期以来认识不足，严重制约了对整个造山带折返过程与机制的深入理解。襄樊-广济断裂带是大别造山带最南端的折返边界，是研究造山带南部折返作用的最佳对象，但对该断裂带长期缺乏系统而深入的研究。本项目拟以襄樊-广济断裂带为研究对象，系统分析断裂带的变形特征、变形期次与变形环境等，并选取角闪石、白云母、黑云母与钾长石等单矿物进行40Ar/39Ar热年代学分析，查明该断裂带印支期的变形规律、演化过程及其发育机制，从而揭示大别造山带南部的折返过程与规律。该项目的研究成果将深化对大别造山带整体折返过程与机制的理解。

The exhumation process of the Dabie orogenic belt still remain controversial, especially for the southern part which lacks of detailed research for a long time, leading to the limitation to understand the exhumation process and mechanism of the entire Dabie orogenic belt. The Xiangfan-Guangji Fault Zone represents the southern boundary fault of the Dabie orogenic belt, and the best research target for exhumation process of the southern part. However, systematic and detailed research of the fault zone are insufficient over a long period of time. This project will focus on the Xiangfan-Guangji Fault Zone. Deformation features, multiple deformation and deformation environment will be explicitly analyzed, and the 40Ar/39Ar dating analysis of amphibole, muscovite, biotite and orthoclase also will be tested. Deformation, evolution and mechanism will be ascertained during the Indosinian of the fault zone. We aim to reveal the exhumation process of the southern Dabie orogenic belt. This project also will improve our knowledge about the exhumation process and mechanism of the entire Dabie orogenic belt.