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地质学报  2007 

藏西措勤含铜岩系的物质来源与成因

, PP. 939-945

Keywords: 措勤,Nd、Sr、Pb同位素,岩浆源区,拉萨地块

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Abstract:

青藏高原中西部措勤县城东南(约100km)的日阿铜矿区发育两种矿化类型,一种是与二长花岗斑岩岩株有关的夕卡岩型铜矿化,另一种是与辉绿玢岩岩脉有关的细脉浸染型铜矿化。Nd、Sr同位素分析表明,它们以高87Sr/86Sr比值,低143Nd/144Nd比值和负εNd(t)为特征,清楚地显示出地壳组分的特点;Pb同位素则以富含放射性成因Pb为特征,206Pb/204Pb,207Pb/204Pb,208Pb/204Pb比值分别为18.672~18.926,15.630~15.685和39.018~39.432,显示出俯冲板片组分在岩浆形成过程中的作用。Nd、Sr、Pb同位素分析表明,它们形成于碰撞后伸展环境。在该环境下,富集的大陆岩石圈地幔发生部分熔融形成的具OIB特征的镁铁质岩浆底侵与地壳岩石相互作用形成了措勤含铜岩系。这个岩系产生于拉萨地块内,从俯冲带演化历史来看,它与南部的印度河-雅鲁藏布江洋壳的俯冲无关,而是北部班公湖-怒江洋壳向南俯冲的结果。

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