1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. The Third Institute of Qinghai Geological Mineral Prospecting, Xining 810029, China

The geochemical features of the monzonitic granite in Qimantage Hutouya deposit area, Qinghai, in respect to the mineralization, suggest that this granite belongs to weak peraluminous and high-k calc alkaline rock series. The REE of the samples show right slope with obvious LREE/HREE differentiation and negative Eu abnormity. The trace elements show enrichment of LILE (Rb, Th, U, La, Nd), and deleption of Ba, Sr, Nd, P, Ti. The Sr-Nb isotopic data indicate that the magma source is mainly aluminosilicate lower crust with a small amount of new crustal materials. The weighted mean zircon U-Pbage of the Hutouya monzonitic granite is 221±1.7 Ma, belonging to Late Triassic. The Hutouya monzonitic granite was formed in the tectonic setting of transition from compression to extension during Middle-Late Triassic.