Abstract: Based on the rock sampling analysis results,the geochemical characteristics of Northern Nachitai of East Kunlun Mountains is discussed.The study results show that the rock is formed in Lower Silurian,the geochemical characteristics of granite diorite show that the rock mass is distributed in high potassium calc alkaline zone,the light rare earth elements is more enriched to high rare earth elements,Eu negative anomaly characteristics is significant,the granite diorite is wholly characterized by Stype granite.Based on the above analysis results,the relationship between 1〖DK(〗∶〖DK)〗50 000 geochemical comprehensive anomaly and element characteristics is discussed,the analogy analysis with the relationship and metallogenic geological condition of the newly found WSn deposit in the area is done.The study results show that the rock mass age is very close to granite age that is the WSn metallogenic parent rock,the granite diorite has the typical metallogenic parent rock characteristics of WSn deposit,besides that,the contents of W,Sn,Bi and Au of 1〖DK(〗∶〖DK)〗50 000 geochemical comprehensive anomaly are high.The comprehensive study results indicated that the prospecting potential of WSn deposit in the granite diorite in Northern Nachitai of East Kunlun Mountains is good.

Key words: East Kunlun orogen belt, Granite diorite, Zircon UPb dating, WSn mineralization, Prospecting potential