The Liwu-type copper deposits are located in the Jianglang dome, one of the domes in the southeastern Songpan-Ganzi fold belt. Based on field investigations and detailed observations, the authors identified two metallogenic processes:banded sulfide ores occurred at the early stage, and massive, disseminated and veined ores were undeformed and superimposed on the early mineralizations at the late stage. In this paper, the authors present the first chalcopyrite Re-Os geochronological data for the Liwu and Zhongzui deposits to exactly constrain the formation age and origin of the metallogenic event. The result yielded a good isochrone age of 343±11 Ma (n=4, 2σ), with an initial ¹⁸⁷Os/¹⁸⁸Os ratio of~2.37. This study indicates that the early banded (deformed) copper mineralization was initiated in the Early Carboniferous, later than the Meso-proterozoic surrounding rocks of the Liwu Group. The main ore-forming source should have been derived form the upper continental crust.