High-silica granitic magmatism is not only considered as one of the key indexes to measure the maturity of continental crust, but also can provide essential information for understanding the growth of continental crust and the rare-mental mineralization. However, the origin, evolution, and geodynamic environment of the high-silica granitic magmatism remains highly controversial. This paper presents a comprehensive study of zircon U-Pb ages, bulk-rock geochemistry, and Sr-Nd isotopes for the Duocai high-silica granites in the central Tibetan Plateau. Zircon U-Pb dating of the studied rocks yields ages of 219±2 Ma, indicating those rocks represent the products of the Late Triassic magmatism. The Duocai granites have I_Sr ratios of 0.708 4, εNd(t) values from -8.12~-7.36, and t_2DM ages of 1.65~1.59 Ga, similar to the Triassic turbidites in the Hohxil-Bayan Har-Songpan-Garzê (HBSG) terrane. Geochemical and isotopic signatures indicate that the Duocai high-silica granites might be derived from partial melting of meta-greywackes, and they had experienced a relatively high degree of fractional crystallization. Combining with the other regional studies, the Late Triassic magmatism in the north margin of the North Qiangtang (NQ) terrane was induced by slab rollback of the Garzê-Litang Palaeo-Tethyan ocean.