鄂尔多斯盆地特拉敖包铀矿产地钻孔岩心元素地球化学分布特征研究  

Study on the Elemental Geochemical Distribution Characteristics of Drill Core Samples from the Telaaobao Uranium Ore Field in the Ordos Basin

作　　者：石雅静 刘汉彬[1] 金贵善[1] 张建锋[1] 李军杰[1] 韩娟[1] 石晓[1] 张佳[1] SHI Yajing;LIU Hanbin;JIN Guishan;ZHANG Jianfeng;LI Junjie;HAN Juan;SHI Xiao;ZHANG Jia(Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院,北京100029

出　　处：《铀矿地质》2025年第2期347-370,共24页Uranium Geology

基　　金：核能开发项目“南岭诸广地区花岗岩型铀矿三维预测与资源扩大技术研究”(编号:地H2301-2)资助。

摘　　要：以鄂尔多斯盆地特拉敖包铀矿产地钻孔样品为研究对象,对研究区内元素地球化学特征、共生组合特征及空间分布特征进行分析,总结了特拉敖包矿产地砂岩型铀矿元素地球化学分布特征及主要指示元素。分析结果表明,Li、Be、La、Ce、Pr、Nd、U、Ta等24种元素的富集系数或变异系数较高,具有异常分布特征,并主要表现为5组特征组合:以轻稀土元素为主的Nd、La、Pr、Gd、Tb、Ce、Th组合;与伴生矿物黄铁矿形成有关的Zn、In、Cd、Re、V组合;与造岩矿物有关的Rb、Li、Cs、Be、W组合;氧化还原敏感元素Mo、U、Sb、Tl、Sr组合和Pb组合。元素在空间分布上主要是由成矿作用中流体引起的微量元素在不同地层中分布造成差异,表现为矿体上部地层Sc、Th、Cr、Ti、Fe、Nb富集,矿体赋存层位Pb、Th、V、Zn富集,矿体下部层位Th、Cr富集。Taking the drill core samples from the Telaaobao uranium ore field in the Ordos basin as the research object,this study analyzes the geochemical characteristics of elements,their co-occurrence patterns,and spatial distribution features within the study area.The analysis results indicate that the enrichment coefficients or variation coefficients of 24 elements such as Li,Be,La,Ce,Pr,Nd,U,Ta,etc.,are relatively high,presenting abnormal distribution characteristics.The elements mainly occurs as five characteristic combinations:the combination of LREE such as Nd,La,Pr,Gd,Tb,Ce,Th;the combination related to the formation of associated pyrite,such as Zn,In,Cd,Re,V;the combination related to the rock-forming minerals,such as Rb,Li,Cs,Be,W;the combination of redox-sensitive elements,such as Mo,U,Sb,Tl,Sr,and the combination of Pb.The spatial combination of elements is mainly caused by the distribution of trace elements induced by fluids during the mineralization process in different strata,which is manifested as the enrichment of Sc,Th,Cr,Ti,Fe and Nb in the upper strata of the ore body,the enrichment of Pb,Th,V and Zn in the strata where the ore body occurs,and the enrichment of Th and Cr in the lower strata of the ore body.

关 键 词：指示元素 砂岩型铀矿 地球化学特征 特拉敖包地区 鄂尔多斯盆地 

分 类 号：P595[天文地球—地球化学]