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澳大利亚布朗斯(Browns)Co-Cu-Ni多金属矿床地球化学特征及与中国南方黑色岩系金属矿床对比

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Keywords: 布朗斯,地球化学,Co?Cu?Ni多金属矿床,微量元素,同位素,黑色岩系,中国南方

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Abstract:

黑色岩系中金属元素地球化学特征一直是矿床地质研究的重点。澳大利亚布朗斯Co?Cu?Ni多金属矿产于古元古代黑色岩系中,属典型的层控矿床;该矿床中主要成矿元素为Co、Cu、Ni和Pb,矿化分带不明显,蚀变微弱。δ34S均值范围为-5.21‰~14.78‰,估计生物成因的硫占一定比例,后期有细菌还原硫酸盐成因的高硫同位素组成硫的参与;铅同位素(206Pb/204Pb=16.20~~16.22,207Pb/206Pb=15.48~15.51,208Pb/207Pb=35.86~35.92)表明矿床中铅的来源单一,均为壳源。矿床经历了沉积-成矿-后期热事件的微弱叠加改造。通过与中国南方黑色岩系对比,发现丰富的有机质在金属元素富集成矿过程中起重要作用。布朗斯多金属矿床属正常海水沉积成矿,与中国南方黑色岩系中多金属矿床有较显著区别。

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