中文摘要：

报道了新疆三塘湖地区中二叠统基性火山岩的铂族元素（PGE）地球化学特征。采用镍锍火试金法结合ICP—MS测定了样品的PGE含量。三塘湖火山岩的PGE。息含量低，其PGE原始地幔标准化曲线均向左倾斜，Pt呈正异常。整体上岩石的PGE含量随基性程度降低而减少。样品的Pd／Ir比值（5．8～15．5）、Cu／Pd比值（236×10～1790×10）和Ni／Cu-Pd／Ir关系以及岩石地球化学特征显示，形成-2塘湖中二叠统岩浆岩的初始岩浆为MgO含量较高、PGE无亏损的玄武质岩浆，并在源区发生硫化物熔离作用，促进硫饱和的机制为地壳物质的加入。三塘湖火山岩的各铂族元素含量之间均呈正相关，指示其经历过深部硫化物熔离的残余岩浆在进一步的演化过程中，发生了硫化物的分异作用，同时Pd／Ir与Ni／Cu呈负相关关系，表明残余岩浆还存在橄榄石的分离结晶作用。由于初始岩浆中的PGE在源区就随硫化物熔离出来，故三塘湖地区PGE成矿前景不大。

英文摘要：

This paper reported the geochemical characteristics of platinum-group elements（PGE） for the Mid-Permian marie volcanic rocks of Santanghu area, Xinjiang Uyghur Autonomous Region,North China. The PGE contents of the samples are determined by nickel sulfide fire assay preparation and inductively coupled plasma-mass spectrometry（ICP-MS） analysis. The total PGE contents of the samples are low and their primitive mantle normalized PGE curves are left-inclined with variable positive Pt anomalies. The samples show a decrease trend in PGE contents with magmatic evolution. The Pd/Ir ratios（5.8-- 15.5）, Cu/Pd ratios（236 X 10^3 -- 1 790 X 10）, Pd/Ir vs. Ni/Cu plotting, and major element geochemistry suggest that the volcanic rocks had high MgO and undepleted PGE contents. The primary melts had experienced sulfide segregation in magma chamber, and the continental input was the main factor leading to sulfur sat uration and sulfide segregation. The samples＂ PGE shows a positively intra-correlation,indicating that the post segregation residual magmas in deep crust experienced a further sulfide fractionation and negative Pd/Ir vs. Ni/Cu correlation indicates a coupled olivine fractionation. The Santanghu mid-Permian strata have a poor PGE metallo genic prospect because PGE had segregated with sulfide for primitive magmas in chamber.