Abstract:

Yejili intrusion in Inner Mongolia is situated at the 100 km northeast of Jinchuan Cu-Ni-PGE sulfide deposit. It consists of wehrlite, lhezolite, gabbro and diorite. The REE distribution pattern shows weak LREE richment characteristics, （La/Yb）_N=1.866-2.713, which are different from the characteristics of convergent plate marginal basalt. ε_Nd(t)＞0 shows that the sources of magma come from depleted mantle. The value of Mg^# and Ni content in the intrusion show that it formed through crystal cumulus processes. Yejili intrusion and Jinchuan intrusion all belong to the continental-margin metallogenetic system of North China Craton. They have the same geochemical characteristics in m/f value, rare earth elements and trace elements.The nickel content in the Yejili intrusion is depleted. These characteristics show there is a potential forming of Cu-Ni sulfide deposits in the Yejili intrusion.

Key words: Yejili intrusion, petrological and chemical characteristics, Cu-Ni-PGE sulfide deposit, Jinchuan, Inner Mongolia