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矿床地质  2002 

再论长英质隐爆角砾岩的气热流体溶浸成矿机制——隐爆角砾岩型铀矿床的稳定同位素地球化学证据

Keywords: 稳定同位素,水-岩氧原子质量比值,岩浆-外来水混合爆发模式,隐爆角砾岩,铀矿床

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Abstract:

为进一步阐明长英质隐爆角砾岩的成因及其气热溶浸成矿流体和成矿物质的来源,文章对闽北570及赣南6722隐爆角砾岩型铀矿床的矿石矿物、蚀变围岩、基底岩石的氧、氢、硫、碳、铅同位素地球化学特征进行了综合研究,并得出以下结论:①在主成矿期和矿后期有大气降水成分的外来水混合加入成矿流体;②蚀变流纹岩和蚀变花岗岩的水-岩氧原子质量比值(分别为0.21和0.26)为隐爆角砾岩的岩浆-外来水混合爆发模式提供了佐证;③成矿流体中的矿化剂组分(CO-2+3,HCO-3,HS-等)主要来自壳幔深部;④成矿物质不仅与赋矿主岩(火山岩)有关,而且部分来自基底岩石(花岗岩和变质岩)。

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