Geochemistry of Mafic-ultramafic Intrusions and Cu-Ni-(PGE) Sulfide Deposits in Panxi Region,China

A series of mafic-ultramafic intrusions with Cu-Ni-(PGE) sulfide deposits are occurred along the NS-trending fault zone in Panxi region of China, which have different ore-bearing feature. The comparison in geochronology and geochemistry indicate that, there is a close geneticrelationship among Yangliuping, Limahe, Baimazhai, Zhubu and Jinbaoshan deposits, which serve as the products of Emeishan mantle plume. Sr-Nd, Re-Os and S isotopic characteristics show that the parental magma of ore-bearing mafic-ultramafic intrusions in Panxi region have suffered the contamination of crustal materials; PGE elements variation features make it clear that the parental magma of intrusions has experienced the separation of sulfide, which lead to the formation of mineral deposit. Different degrees of crustal contamination and different progress of sulfide separationfinally result in the disparate ore-bearing features of mafic-ultramafic intrusions that sourced from the samemantle plume.Furthermore, the intrusions respectively represent the product of different stages(early, middle, later stage) in the evolutionary process of parental magma. Jinbaoshan and Zhubu PGE deposits serve as the products of early evolution stage:Yangliuping Cu-Ni-PGE deposit is formed by theparental magma in middlestage, while Limahe and Baimazhai Cu-Ni deposits are formed in later stage of parental magma.