【摘要】 本文讨论了龙门山造山带中段上孟—漩口一线石英方解石脉的微量元素地球化学特征。结果表明：与方解石相比，石英杂质元素总量很低，特别是稀土元素含量远低于方解石，但Ｋ、Ｎａ、Ｃｒ、Ｃｏ、Ｔｈ 等则变化不大；石英与方解石均富集重稀土；石英与方解石的稀土元素配分型式总体相似，暗示其来源之间有一定的联系；石英和方解石脉均有强的铕正异常，不同层位的样品铕正异常强度不同，指示围岩条件的差异及形成条件的影响。更多还原

【Abstract】 This paper discusses minor element geochemistry for quartz and calcite veins from Shangmeng Xuankou sector of the middle Longmenshan orogen The results indicate that:1 in comparison with calcite veins,only a very low content of minor elements,especially REE,is kept in quartz veins,while contents of K,Na,Cr,Co Th,U,As,Sb are almost same in both veins;2 relative enrichment in HREE is shown in both veins;3 REE partitioning patterns of both veins are very similar to each other which indicates some relations of their sources;4 Both quattz and calcife veins show very strong positiveu Eu anomaly with anomaly intensity varying with sampling layers which reflects the effect of host rocks and veining conditions更多还原