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蛇绿岩生成构造环境的Ba-Th-Nb-La判别图

被引：182
作者：
李曙光
机构：
[1] 中国科学技术大学地球与空间科学系合肥
来源：
岩石学报 | 1993年 / 02期
关键词：
蛇绿岩; 痕量元素地球化学;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Pearce的Ti-Zr-Y图不能很好区分洋脊和岛弧玄武岩,Ti对岩浆分离结晶作用很敏感,因此用这个图判别蛇绿岩生成构造环境效果不好,本文利用分配系数相近的Ba,Th,Nb,La四个非常不相容元素的(Ba/Nb)-Ba,(Nb/Th)-Nb,(La/Nb)-La和(Ba/Nb)-(Th/Nb)图解很好区分了洋脊、岛弧、洋岛玄武岩。弧后盆玄武岩同时具有洋脊和岛弧玄武岩的特征。这些元素在海水蚀变中较稳定,它们的比值在分离结晶过程中保持不变,因此这些图解有利于判别蛇绿岩(包括熔岩和均质辉长岩)生成的构造环境。
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页码：146 / 157
页数：12
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