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地质学报  2002 

山东济阳拗陷第三纪玄武岩的铅同位素研究

, PP. 33-38

Keywords: 第三纪玄武岩Pb同位素山东济阳拗陷铅同位素

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Abstract:

山东济阳拗陷第三玄武岩的Pb同位素组成变化明显:^206Pb/^204Pb值为16.864-18.361,^207Pb/^204Pb值为15.268-15.599,^208Pb/^204Pb值为36.770-39.118。在Pb-Pb和Pb-Sr图上,所有数据点形成良好的线性关系,而且都分布于DMM、EMⅠ和EMⅡ3个地幔端员组分之间。这些特征表明,同位素组成的明显变化应主要归因于玄武岩浆形成幔源区中不同端员组分之间的混合作用,地壳混染作用影响不明显。

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