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矿床地质  2009 

华南志留纪钼的矿化:白石顶钼矿锆石SHRIMPU-Pb年龄和辉钼矿Re-Os年龄证据

Keywords: 地球化学,石英脉型钼矿,志留纪,加里东期,花岗岩,白石顶,华南

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Abstract:

白石顶钼矿床位于湘粤桂交界的桂北姑婆山地区,主要以石英辉钼矿脉的形式产于桂岭岩体(角闪石)黑云母二长花岗岩和南华系浅变质浅海相碎屑岩中。桂岭岩体岩石类型以中_细粒斑状(角闪石)黑云母二长花岗岩为主,岩石呈灰白色,似斑状结构。斑晶主要由微斜长石和斜长石组成,基质则由微斜长石、斜长石、石英、黑云母和普通角闪石组成,副矿物有磁铁矿、锆石、褐帘石、绿帘石、磷灰石、榍石等。白石顶钼矿的矿石矿物主要为辉钼矿、黄铁矿、黄铜矿和白钨矿等。围岩蚀变有黄铁矿化、钾长石化、白云母化、绿泥石化等。文章通过对桂岭岩体及其包体中锆石SHRIMPU-Pb年龄和辉钼矿Re-Os年龄的测定,初步揭示了白石顶钼矿床的成矿年代,桂岭岩体(角闪石)黑云母二长花岗岩锆石SHRIMPU-Pb年龄为(424.4±5.6)Ma,其中的闪长质包体的SHRIMPU-Pb年龄为(428±4)Ma。6件辉钼矿Re-Os的加权平均年龄为(424.6±5.7)Ma,这表明白石顶钼矿床形成于志留纪。此次工作首次认为在华南地区志留纪也发生了金属钼的富集成矿,该成果对于深入认识华南地区加里东期的构造_岩浆演化及其成矿作用具有重要的科学价值。

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