云南禄劝县子母山基性岩墙的地球化学特征及其成因机制
首发时间:2012-11-13
摘要:本文对云南禄劝县子母山地区的基性岩墙进行了岩石学和地球化学的研究。主量元素特征和微量元素标准化图解显示,基性岩墙属于拉斑玄武岩系列,具有洋岛玄武岩(OIB)的特征,与峨眉山玄武岩为同源产物,存在密切的成因关系。岩墙经历了较大程度的演化,低的氧逸度导致了岩浆的Ferra演化趋势,使得残留岩浆具有富铁富钛的特征。但是岩墙缺乏明显的Nb,Ta和Ti的负异常指示了岩浆没有经历明显的地壳物质的混染,是峨眉山地幔柱岩浆演化晚期的产物。
关键词: 峨眉山大火成岩省 峨眉山玄武岩 地幔柱 基性岩墙 子母山
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Geochemistry and petrogenesis of the Permian basic dykes in Zimushan, Luquan county, Yunnan Province
Abstract:Petrology and geochemistry were performed systematically on basic dykes in Zimushan, Luquan county, Yunnan province. On the basis of major and trace elements patterns, basic dykes belong to tholeiite basalt serie in lithology and have OIB (Ocean island basalts) features, which were homologous with Emeishan basalts. Basic dykes experienced a large scale of evolution. Low oxygen fugacity caused the Ferra evolution tendency of magma, resulting in the enrichment o Fe and Ti in the residual magma. However, the marked deficit of Nb, Ta and Ti didn't appear in the basic dykes, which inferred that they formed without crustal contamination. The Zimushan basic dykes were formed in the late period of Emeishan mantle plume magmatism.
Keywords: Emeishan large igneous province Emeishan basalts Mantle plume Basic dykes Zimushan
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