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地质论评  2001 

云南老王寨金矿煌斑岩固定铵(NH4^+)地球化学特征

Keywords: 煌斑岩金矿床蚀变流体固定铵地球化学矿化作用矿床地质

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Abstract:

云南老王寨金矿与金矿化时空密切共生的煌斑岩可分为新鲜(弱蚀变)、蚀变和矿化3种。固定铵(NH4^)含量测定结果表明,新鲜煌斑岩固定铵含量明显高于其他幔源岩石、低于矿区碳质围岩的固定铵含量。笔者认为该特征可能不是地壳混染的结果,从新鲜煌斑岩→蚀变煌斑岩→矿化煌斑岩,固定铵含量递增,且与金含量具较好的正相关,表明矿区煌斑岩蚀变流体和矿化流体中均可能存在铵,铵在金矿化流体中对金的迁移起了作用。

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