Abstract:The Binggounan maficultramafic intrusion is located in the East Kunlun orogenic belt that belongs to the southwestern margin of Qaidam basin and adjacent to the Kunbei fault. This intrusion is mainly made up of olivinepyroxenite, gabbro, diorite and diabase dykes, but the orebodies only occur in the olivinepyroxenite. Petrologic and geochemical characteristics show that the Binggounan maficultramafic intrusion was a ferruginous series maficultramafic intrusive body and the deposit belongs to magmatic segregation sulfide CuNi deposit. The SHPIMP UPb age (377.8±3.4 Ma) of the zircons in the olivinepyroxenite indicates that it is a relatively young CuNi deposit in the East Kunlun orogenic belt. The rocks in the deposit have positive εNd(t) values ranging from +2.35 to +3.81 and (87Sr/86Sr) i from 0.7057 to 0.7105, indicating that the magma have experienced some contamination of the surrounding rocks which probably led to the sulfur saturation and then the immiscible of the sulfides. The Binggounnan CuNi deposit perhaps is a product in the postcollision tectonic setting, which is different from the Xiarihamu CuNi deposit. Therefore, the study is of significant implication for the exploration of CuNi deposits in the East Kunlun orogenic belt.