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矿床地质  2002 

内蒙古东七一山萤石矿床的稀土元素地球化学特征及成因

Keywords: 稀土元素,萤石,热液流体,东七一山,内蒙古

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Abstract:

运用等离子质谱和等离子体光谱对内蒙古东七一山萤石矿的萤石矿石和围岩样品的稀土元素进行了系统分析。结果表明,矿石的∑REE<30×10-6,LREE为5×10-6~15×10-6,HREE<5×10-6,Y<20×10-6;而围岩的∑REE>290×10-6,LREE>240×10-6,HREE>40×10-6,Y>70×10-6。可将萤石矿石的稀土元素的分布型式分为轻、重稀土富集型两类:一类矿石的∑REE多小于29×10-6,LREE/HREE和La/Yb分别大于7和12,δEu、δCe的变化范围分别为0.85~1.10,Ce、Eu基本不显异常;另一类的∑REE约18×10-6,LREE/HREE和La/Yb分别小于3和2,δEu为0.45~0.70,δCe为0.70~0.90,具明显的负Eu异常,Ce微具负异常。矿石与围岩的稀土地球化学研究显示,该萤石矿系岩浆热液成因。

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