贵州台江龙井街铅锌矿床稀土元素地球化学特征  

REE Geochemical Characteristics of the Longjing street Lead-zinc Deposit in Taijiang Guizhou

作　　者：耿忠武 李明琴[1] GENG Zhong-wu;LI Ming-qin(CoUlege of Resources and Environmental Engineering,Guizhou University,Guiyang 550003,Guizhou,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025

出　　处：《贵州地质》2017年第4期280-284,共5页Guizhou Geology

基　　金：贵州省公益性;基础性地质勘查项目资助(黔财建[2011]114号)

摘　　要：利用电感耦合等离子体质谱仪测定龙井街铅锌矿床中矿石及围岩的稀土元素含量,探讨矿床稀土元素地球化学特征及其揭示的地质意义。研究结果表明,矿石与围岩的稀土元素球粒陨石标准化配分曲线均表现出轻稀土较富集,曲线右倾的特点;矿石与围岩均显示∑REE较低,LREE较富集、HREE亏损;(La/Sm)N和(Gd/Yb)N值均反映LREE富集,LREE分馏强于HREE;矿石的δEu值介于0.67 1.28之间,均值0.88,δCe值在0.77 1.09之间,均值0.86。而围岩的δEu值在0.70 0.87范围,均值0.76,δCe值在0.80 0.89之间,均值0.85。这些特征说明矿区成矿物质和成矿流体主要来自围岩,但成矿流体中有深部热流体的加入;从早期形成的Zn S到晚期形成的Pb S,其成矿还原环境逐渐减弱,成矿温度逐渐下降。Use inductively coupled plasma mass spectrometer to test the content of REE about ore and wall rock,in Longjing street lead-zinc deposit,in the while,discuss geochemical characteristics of rare earth elements and its geological significance Research indicates that standardized score curve of chondrite in REE of ore and wall rock appears abundant light REE and right-inclined;Both core and wall rock display low∑REE,LREE is more abundant,HREE is loss;Both(La/Sm)N and(Gd/Yb)N reflect abundant LREE,LREE’s fractional distilation is stronger than HREE;Ore’sδEu is between 0 671 28(0 88 on average),δCe is between 0 771 09(0 86 on average)However,wall rock’sδEu is 0 700 87(0 76 on average),δCe is 0 800 89(0 85 on average)These features state that ore forming material and ore-forming fluid in mining area are mainly come from wall rock,while there is deep hot fluid in ore-forming fluid;From early formation of ZnS to late formation of PbS,the ore environment weakened gradually,the ore temperature decrease gradually.

关 键 词：铅锌矿床 稀土元素地球化学特征 台江龙井街 贵州 

分 类 号：P595[天文地球—地球化学] P618.42[天文地球—地质学]