汪双双;柳益群;周鼎武;焦鑫;南云;

• 1:西北大学大陆动力学国家重点实验室
• 2:西北大学地质学系
• 3:山东科技大学地质科学与工程学院

摘要(Abstract)：

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总含量低,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(236×103~1 790×103)和Ni/Cu-Pd/Ir关系以及岩石地球化学特征显示,形成三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。

关键词(KeyWords)： 铂族元素;初始岩浆;苦橄岩;硫饱和

Abstract:

Keywords:

基金项目(Foundation): 西北大学研究生交叉学科资助项目(10YJC10);; 国家自然科学基金项目(41272116);; 高等学校博士学科点专项科研基金项目(20126101110020)

作者(Author): 汪双双;柳益群;周鼎武;焦鑫;南云;

Email:

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