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地球学报  2004 

鲁西平邑磨坊沟碲金型金矿的地质特征及成因机制

Keywords: 磨坊沟金矿,碲金型,拆离滑脱带,幔枝构造

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Abstract:

本文通过研究鲁西平邑磨坊沟金矿矿层,详细研究了围岩蚀变特征和成矿流体特征,结合硫、氧同位素资料,探讨了该矿床的成因机制。磨坊沟金矿呈似层状产于新太古代花岗闪长岩或古元古代二长花岗岩与寒武系主拆离滑脱带之上的早寒武世朱砂洞组碳酸盐岩中,围岩蚀变包括黄铁绢英岩化、方解石化和萤石化,金矿的形成主要与黄铁绢英岩化有关。成矿流体的均一温度集中于103~220℃之间,盐度在4.65%~13.18%范围内。从矿物成分看,该矿床属于碲金型金矿。同位素研究表明,矿层中硫来源于地幔,而氧同位素则显示其成矿过程有大气降水的参与。矿质迁移经过了鲁西幔枝构造中深、浅层次的拆离滑脱构造,最终卸载于次级拆离滑脱带断坪和断坡中。

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