The Qiman Tagh metallogenic belt is one of the most important porphyry-skarn mineralization areas in China, which lies in the west of the East Kunlun orogenic belt.The Galinge deposit is one of the largest skarn iron polymetallic deposits in this belt.In this study,the ore-forming age is performed on the phlogopite using 40Ar-39Ar dating method, which yielded an isochron age of 234.1±3.7Ma, an inverse isochron age of 234.2±3.5Ma, and a plateau age of 235.8±1.7Ma.These three age data are highly consistent within error. Therefore, the plateau age can represent the mineralization time.The result from this study, as well as the previously reported data, indicates a large-scale Middle-Triassic mineralization in the Qiman Tagh metallogenic belt, which is closely related to the Middle-Triassic granodioritic magmatism, and can be explained as a response to the regional post-collisional extension.