潘谢矿区地下水稀土元素地球化学特征及控制因素  

Geochemical Characteristics and Controlling Factors of Rare Earth Elements of Groundwater in the Panxie Mining Area

作　　者：汤之铭 姜春露[1] 安士凯 郑刘根[1] 陈永春 Tang Zhiming;Jiang Chunlu;An Shikai;Zheng Liugen;Chen Yongchun(School of Resources and Environmental Engineering,Anhui University,Engineering Laboratory far Mine Ecological Restoration in Anhui Province,Hefei 230601,China;National Engineering Laboratory of Coal Mine Ecological Eiwironment Protection,Huainan 232011,China)

机构地区：[1]安徽大学资源与环境工程学院安徽省矿山生态修复工程实验室,安徽合肥230601 [2]煤矿生态环境保护国家工程实验室,安徽淮南232011

出　　处：《中国稀土学报》2021年第6期962-972,I0004,共12页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(41602310,42072201);中国博士后科学基金项目(2017M611044)资助。

摘　　要：为揭示煤矿区地下水稀土元素地球化学特征,采集潘谢矿区松散层、太原组灰岩(太灰)和奥陶系灰岩(奥灰)3个含水层共65个水样,进行稀土元素测试,探讨不同含水层稀土元素的含量特征及控制因素。结果表明:研究区地下水整体呈弱碱性,水质类型整体为Cl-Na,Cl·HCO_(3)-Na型。地下水稀土元素含量总体较低,轻稀土元素亏损,中重稀土元素富集。奥灰水中稀土总量最低,可能与金属氧化物(如铁、锰)吸附或与碳酸岩(如方解石)发生共沉淀有关。3个含水层地下水均表现为明显的Eu正异常,可能与含水介质中富Eu矿物(如长石)的优先化学风化溶解有关。太灰水和奥灰水Ce负异常明显,松散层水Ce负异常较弱,研究区地下水Ce负异常与其继承母岩密切相关。pH对水体中的稀土元素总量的控制与碱度有关,碱度较低时控制作用显著。碳酸根的络合反应、铁的胶体或氧化物与稀土元素的吸附/络合反应是稀土元素分异的重要控制因素。In order to reveal the geochemical characteristics of rare earth elements in groundwater in coal mines,a total of 65 water samples were collected from three aquifers in the Panxie mining area,i.e.,loose aquifer,the Carboniferous karst aquifer of Taiyuan formation and the Ordovician karst aquifer,and the rare earth elements were conducted.The content characteristics and influencing factors of rare earth elements in different aquifers were discussed.The results showed that the groundwater in the study area is weakly alkaline as a whole,whose water chemical type is either the Cl-Na-type or the Cl·HCO_(3)-Na type.The content of rare earth elements is generally low,light rare earth elements are deficient,and medium and heavy rare earth elements are enriched.The total amount of rare earth in the Ordovician karst aquifer is the lowest,which may be related to the adsorption of metal oxides(such as Fe;and Mn;)or the co-precipitation of carbonate rocks(such as calcite)All three aquifers showed obvious positive Eu anomalies,which may be related to the preferential chemical weathering and dissolution of Eu-rich minerals(such as feldspar)in the sediments.The negative Ce anomalies of the Carboniferous karst aquifer of Taiyuan formation and the Ordovician karst aquifer are obvious,and the Ce negative anomalies of the loose layer water are weak,which are not only affected by the redox effect,but also closely related to those inherited parent rock.The control effect of pH on the total amount of rare earth elements in the water body is related to the alkalinity,and the control effect is significant when the alkalinity is low.The complexation reaction of carbonate and the adsorption/complexation reaction of iron colloids or oxides and rare earth elements are important control factors for the differentiation of rare earth elements.

关 键 词：稀土元素 地下水 潘谢矿区 络合作用 

分 类 号：P641.3[天文地球—地质矿产勘探]