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矿床地质  2008 

义县萤石矿床稀土元素地球化学特征及其指示意义

Keywords: 地球化学,稀土元素,成矿流体,萤石矿床,义县

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Abstract:

为了研究辽西义县萤石矿床的成矿机理及成矿流体来源,文章对矿区萤石稀土元素进行了分析。结果表明:2种类型的萤石为同源不同阶段的产物,从成矿早期至晚期,LREE逐渐减少,Ce负异常由弱变强,Eu则均显明显的正异常;矿床成矿流体主要来源于中侏罗世髫髻山旋回岩浆热液;成矿过程为岩浆热液与围岩(主要为白云质灰岩和灰岩)的相互作用,并有天水的混入;成矿环境相对氧化。

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