贵州晴隆冬瓜林萤石矿床微量和稀土元素地球化学特征  

Geochemical characteristics of trace elements and rare earth elements(REE)of the Donggualin fluorite deposit in Qinglong City,Guizhou Province

作　　者：徐阳东[1] 祁连素 尹廷龙 陈智[1] 董淑惠 郑前飞 XU Yang-dong;QI Lian-su;YIN Ting-long;CHEN Zhi;DONG Shu-hui;ZHENG Qian-fei(Institute of Geophysical and Geochemical Prospecting,Bureau of Geology and Mineral Resources Exploration and Development of Guizhou Province,Guiyang,550018,China)

机构地区：[1]贵州省地矿局地球物理地球化学勘查院,贵州贵阳550018

出　　处：《矿物学报》2023年第6期853-860,共8页Acta Mineralogica Sinica

基　　金：贵州省科技计划找矿突破战略行为重大协同创新项目(编号:黔科合战略找矿[2022]ZD004)。

摘　　要：冬瓜林萤石矿床是贵州西南部晴隆大厂锑矿床南东新发现的一处规模达中型的代表性萤石矿床,矿床中伴生少量的锑矿。本文在开展该萤石矿床地质调查工作的基础上,对萤石及围岩样品的微量和稀土元素地球化学组成特征进行分析,并与大厂锑矿伴生萤石的微量元素组成进行对比,以认识该矿床的成因,探讨其成矿物质来源。结果表明,所有萤石样品中的Sb和Ti等元素含量相对于上地壳呈现出显著富集的特征,Y相对较富集,而其他元素呈现出亏损特征。全部萤石样品的稀土元素配分模式相近,所含的稀土元素总量均不高,其∑REE变化范围为12.7×10^(-6)~32.7×10^(-6),均值18.5×10^(-6),与晴隆大厂锑矿伴生的萤石稀土元素组成特征相似。同时,所有萤石样品的Eu呈现弱负异常特征(δEu为0.79~0.96,均值0.87),而Ce呈现出明显负异常特征(δCe为0.65~0.79,平均0.71),其配分模式也与晴隆大厂锑矿伴生萤石类似。推测东瓜林萤石矿床与晴隆大厂锑矿属于同一个成矿系统,均为低温热液成因,萤石-锑矿化可能形成于相对还原的环境。此外,冬瓜林萤石矿床成矿物质主要来自于各类围岩(碳酸盐岩和玄武岩),流体与围岩的相互作用,即水岩反应是导致该区萤石沉淀富集成矿的重要因素。.The Donggualin fluorite deposit is a representative medium-sized fluorite deposit newly discovered in the southeast of the Dachang antimony deposit in Qinglong City of the southwestern Guizhou.There is a small amount of associated antimony ore in the deposit.In this paper,on the basis of the geological survey of the fluorite deposit,we have analyzed geochemical characteristics of trace elements and rare earth elements of fluorites and wallrock samples,and have made comparitive study with the trace element compositions of associated fluorites of the Dachang antimony deposit,in order to analyze the origin of the Donggualin fluorite deposit and to explore its source of ore-forming materials.The results show that all fluorite samples have significantly enriched Sb and Ti,and relatively enriched Y,but depleted other elements compared with the upper crust.All fluorite samples have similar REE distribution patterns,and relatively low total contents of the REE.TheirΣREE contents vary from 12.7×10^(-6) to 32.7×10^(-6),with the average value of 18.5×10^(-6).They have similar REE compositional characteristics of the associated fluorites in the Dachang Antimony Mine of Qinglong City.Meanwhile,all fluorite samples have weakly negative Eu anomalies(δEu:0.79-0.96,average of 0.87),and obviously negative Ce anomalies(δCe:0.65-0.79,average of 0.71).Their REE distribution patterns are similar to those of associated fluorites in the Dachang Antimony Mine of Qinglong City.It is speculated that the Donggualin fluorite deposit and the Dachang antimony deposit could be formed in a same metallogenic system which is of the low temperature hydrothermal origin.The fluorite and antimony mineralization could be formed in a relatively reduced environment.In addition,the ore-forming materials of the Dongguanlin fluorite deposit could be mainly sourced from all kinds of wallrocks(carbonates and basalt).The interaction between the ore-forming fluid and wallrocks,that is,the water/rock reaction could be an important factor leading to the en

关 键 词：冬瓜林萤石矿床 微量元素 稀土元素 矿床成因 晴隆 

分 类 号：P61[天文地球—矿床学] P595[天文地球—地质学]