新疆三塘湖盆地中二叠统基性火山岩铂族元素地球化学特征及地质意义Geochemical Characteristics and Geological Significance of Platinum-Group Elements for Mid-Permian Mafic Volcanic Rocks from the Santanghu Basin,Xinjiang
汪双双;柳益群;周鼎武;焦鑫;南云;
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
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;
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DOI:
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