滇东北矿集区茂租铅锌矿床萤石的稀土元素特征及其指示意义
发布时间:2018-02-09 10:44
本文关键词: 萤石 稀土元素地球化学特征 茂租铅锌矿床 成矿流体 出处:《中国稀土学报》2017年03期 论文类型:期刊论文
【摘要】:巧家茂租铅锌矿床是滇东北矿集区的代表矿床之一,除矿石矿物闪锌矿、方铅矿、黄铁矿外,萤石是其主要的脉石矿物。通过萤石的稀土元素地球化学特征研究,发现其中REE含量变化较大,特征参数也有差别,但其球粒陨石标准化曲线分配模式基本一致,不同矿化带萤石均具有明显的Ce负异常、中稀土富集、分配曲线相对平缓的特征。从铅锌矿体中心到外围矿化带,萤石稀土元素呈现∑REE逐渐减少、LREE富集变为HREE富集,δEu正异常变为δEu负异常,δCe逐渐变小的变化特征。表明该矿床萤石的形成是一个连续过程,不同矿化带的萤石是同一体系经历不同阶段的产物。通过萤石的形成机制分析,认为该矿床萤石是热液作用的产物,是由富含F的成矿流体沿构造活动带从下向上运移,与灯影组地层的白云岩发生水-岩的相互作用,使流体中的CaF_2产生过饱和而大规模沉淀析出形成的,且随着热液向两侧围岩迁移,不断与围岩发生水岩反应,分别形成了不同矿化带的萤石。本文研究对揭示矿床铅锌成矿机制具有重要意义。
[Abstract]:QiaojiaMaozhao lead-zinc deposit is one of the representative deposits in northeast Yunnan. Except for sphalerite, galena and pyrite, fluorite is the main gangue mineral. The geochemical characteristics of rare earth elements of fluorite are studied. It is found that the REE content varies greatly and the characteristic parameters are different, but the distribution pattern of the standardized curve of chondrites is basically the same. The fluorite in different mineralization zones has obvious negative ce anomaly and enrichment of middle rare earth. The relatively gentle characteristics of the distribution curve. From the center of the Pb-Zn orebody to the peripheral mineralization zone, The rare earth elements of fluorite show the characteristics of 鈭,
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