The West Qinling Terrane, which was formed and superimposed on the Early Paleozoic orogen and plunged into the Qilian and Kunlun orogenic belts, is a typical accretionary orogen and characterized by a plurality of ophiolitic melanges, large-scale shear zones, Mesozoic volcanic-magmatism, and abundant porphyry-skarn deposits, showing a inverted triangular shape in the geological map of the Tibetan Plateau and adjacent area. Many facts indicate that East Kunlun, West Qinling and Qilian orogenic belts should have united and an EW-trending magmatic arc should also be formed in the Triassic. Hf isotopic data of the zircons and geochemistry of the arc-related granitoids suggest that some magmatism should be derived from the melting of the subduction-accretion complex.