Abstract:The western section of the Eastern Kunlun Orogenic Belt is rich in mineral resources and a wide variety of rocks, and is an important mineral production base in western China. In order to deepen the understanding of structure evolution and metallogenic regularity in this area, the Xiarihamu-Xitieshan metallogenic belt rocks were selected as the research object. Through the observation of light and thin slices of rock samples, the analysis of major elements and trace elements, the research on rocks, minerals and geochemistry was carried out, and the rock formation and structure environment were discussed. The research preliminary shows that the ultrabasic rocks in this area contain more metal minerals, high content of Fe₂0₃ and Fe0, high field strength elements Th, U, Y, Hf are enriched, and light and heavy rare earth fractionation is obvious, Cerium has a slight negative anomaly. It indicates that the partial melting of the transition from depleted spinel-phase mantle peridotite to garnet-phase mantle peridotite, and crustal material has been added. Judging its structure environment as a continental rift environment. The basic rocks contain more potash feldspar and plagioclase, high content of CaO and Na₂O + K₂O, it belongs to calcium alkaline rock. The high field strength elements Nb, Zr, U and Ta are depleted, Rb, Sr enrichment, and light and heavy rare earth fractionation is obvious, Europium has a positive anomaly, Cerium has a slightly negative anomaly. The material source of rock is related to both the mantle and the lower crust. The structure environment formed is an island arc environment, and the formation location is on the side close to the mainland.