The greenschist facies Zhangbaling Group is exposed along the Tan Lu Fault Zone at the eastern margin of the Dabie orogenic belt. Its protolith ages and reason for the deformation and metamorphism remain unknown. Eight meta volcanic rock samples were collected for LA-ICP-MS U-Pb dating. The results indicate their protolith ages of 748~750 Ma, i.e. the Nanhua period of the middle Neo proterozoic. They belong to the lower cover of the Yangtze Plate rather than the basement rocks as proposed before. On the bases of their deformation and metamorphism, previous muscovite 40Ar/39Ar dating results as well as comparison with the Dabie orogenic belt, it is proposed that the deformation and metamorphism of the Zhangbaling Group in the southwestern margin of the orogenic resulted from the orogenic crust subduction and exhumation, and those along the Tan Lu Fault Zone at the eastern margin were caused by sinistral shearing of the fault zone. The understanding offers important evidence for the origin of the Tan Lu Fault Zone during collision between the North China and Yangtze plates, and support the collision related origin mdoel of intralplate transform faulting or an oblique collision boundary.