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矿床地质  2010 

广西德保铜锡矿床辉钼矿Re-Os同位素定年及对加里东期成矿的探讨

Keywords: 地质学,Re-Os等时线,铜-锡矿床,加里东期,德保,广西

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Abstract:

广西德保铜锡矿床为一矽卡岩型矿床。笔者对采自该矿床的7件不同矿化类型的辉钼矿样品,进行了Re-Os同位素定年,获得的模式年龄为(429.5±5.9)~(440.0±6.9)Ma。其中,采自含矿石英脉的6件辉钼矿样品的Re-Os模式年龄加权平均值为(435.0±2.5)Ma,等时线年龄为(445±11)Ma,表明该地区曾于晚奥陶世—早志留世发生过成矿作用,是华南加里东运动的产物。文章提供了关于右江地区加里东期成矿作用的信息,深化了对该地区成矿演化历史的认识,进而强调了对于寻找钦甲式Cu_Sn矿床的意义。

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