摘要
The Limahe nickel deposit is one of the important PGE-poor Ni-Cu deposits in the Emeishan Large Igneous Province. This paper mainly analyzes Re-Os isotopic composition of various ore and rocks from the Limahe nickel deposit, discusses source magma, genesis of suphide, ore-forming mechanism and Re-Os isochron. The results show that different rock and rock types of the Limahe deposit are of different initial Os isotopic compositions. The analysis shows that heterogeneity of initial Os isotopic composition in the ore samples is attributed to the mixture of sulfide melt containing high radiogenic 187Os and silicate melt containing low radiogeneic 187Os at a different proportion. Comprehensive study reveals that the Limahe deposit originated from daughter magma which exsolved from deep magma.