水尾山萤石矿稀土元素地球化学特征及成因

REE geochemistry and genesis of the Shuiweishan fluorite ore

水尾山萤石矿赋存于印支期复式花岗岩体的断裂带中,是赣南地区的一个大型萤石矿床。萤石矿石和围岩的稀土元素分析表明,围岩花岗岩的稀土总量、轻稀土和重稀土含量远高于矿石,萤石矿石的稀土元素配分模式主要为轻稀土富集型,围岩花岗岩的稀土元素配分模式为轻稀土富集型,萤石矿石的Ce无异常,Eu呈弱负异常。围岩花岗岩的F、Ca含量较高,分析认为萤石中的F、Ca主要来自于围岩花岗岩。综合分析萤石矿床的地质特征和萤石矿石与围岩的稀土元素土地球化学特征,认为该萤石矿床为低温热液成因。

Shuiweishan fluorite deposit,a large fluorite deposit in southern Gannan area of Jiangxi province,is hosted in the Indosinian complex granites fault zone.Analyzing rare earth element in the fluorite ores and surrounding rocks shows that the total rare earth content,light rare earth content and heavy rare earth content of the surrounding rock of granite are much higher than those of the ores.The distribution pattern of rare earth element in the fluorite ores mainly light rare earth enrichment type,and so it is with the surrounding rock of granite.The Ce of fluorite ore is normal while Eu is negative anomaly（weak）.Based on the comprehensive analysis of the geological characteristics of fluorite deposits and the geochemical characteristics of rare earth elements in fluorite ore and surrounding rocks,it is considered that the fluorite deposits are low temperature hydrothermal genesis.