巴丹吉林盆地伊肯乌苏凹陷砂岩型铀矿矿物学与地球化学特征  

Mineralogical and Geochemical Characteristics of Sandstone-type Uranium Deposits in Yikenwusu Depression of Badain Jaran Basin

作　　者：孟龙 罗森森 牛霆 王刚 郭文 李伟涛 孟秋熠 张文文 MENG Long;LUO Sensen;NIU Ting;WANG Gang;GUO Wen;LI Weitao;MENG Qiuyi;ZHANG Wenwen(Research Institute No.203,CNNC,Xi’an,Shaanxi 711000,China;National Key Laboratory of Uranium Resources Exploration-Mining and Nuclear Remote Sensing,Beijing 100029,China;Beijing Research Institute of Uranium Geology,Beijing 100029,China;Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;East China University of Technology,Nanchang,Jiangxi 330013,China)

机构地区：[1]核工业二〇三研究所,陕西西安711000 [2]铀资源探采与核遥感全国重点实验室,北京100029 [3]核工业北京地质研究院,北京100029 [4]中国地质科学院矿产资源研究所,北京100037 [5]东华理工大学,江西南昌330013

出　　处：《铀矿地质》2025年第2期257-271,共15页Uranium Geology

基　　金：中国核工业地勘基金项目“巴丹吉林盆地及周缘铀矿资源调查评价”(编号:2024-21);“巴丹吉林盆地居延海铀矿资源调查评价”(编号:2024-21-1);“走廊盆地群西部铀矿资源调查评价”(编号:2024-21-6)联合资助。

摘　　要：巴丹吉林盆地是我国北方中大型盆地之一,铀矿勘查工作程度较低,近年来在盆地西北缘伊肯乌苏凹陷首次发现了铀工业矿孔。研究该盆地新发现的砂岩型工业铀矿石矿物学和地球化学特征,探讨其成矿环境与成矿模式,能够为扩大找矿提供理论依据。文章通过对巴丹吉林盆地西北缘伊肯乌苏凹陷新发现的铀工业矿孔含矿岩石的铀矿物类型、赋存状态及不同分带(工业矿石、矿化砂岩及正常砂岩)的主量、微量及稀土元素特征进行系统分析,明确了该地区主要铀矿物类型、赋存状态及与铀成矿密切相关的指示元素,探讨了沉积物源、成矿环境及成矿模式。研究表明,伊肯乌苏凹陷铀矿物以铀石为主,主要赋存在碎屑颗粒边缘,成矿物源来自盆地边部中基性花岗岩体;微量元素Cu、Zn、Mo、Co、Ni、Pb与U含量呈正相关关系,可作为铀富集的指示元素;成矿环境整体为弱氧化-弱还原的过渡环境,铀成矿作用以层间氧化带型为主,叠加少量后期热液改造富集作用。Badain Jaran Basin is one of the medium to large basins in northern China,with a relatively low level of uranium exploration.In recent years,profitable mineralization was discovered for the first time in boreholes in Yikenwusu depression on the northwest edge of the basin.Study of the mineralogical and geochemical characteristics of sandstone hosting the uranium ores,ore-forming environment and model in the basin will provide theoretical basis for the next exploration.The article systematically analyzed the uranium mineral types,occurrence states,and main,trace,and rare earth element characteristics of the ore bearing rocks,and clarified the main uranium mineral types,occurrence states,and indicator elements closely related to uranium mineralization in the area,and discussed the sedimentary sources,mineralization environments,and mineralization models.Research result has shown that uranium minerals in Yikenwusu depression are mainly composed of uranite,which is mainly found at the edges of detrital particles.The source of mineralization rock came from the intermediate basic granite body at the edge of the basin.Trace elements Cu,Zn,Mo,Co,Ni,Pb are positively correlated with the U content,and can serve as indicators for uranium enrichment,the overall mineralization environment was a transitional environment of weak oxidation weak reduction,and uranium mineralization was mainly characterized by interlayer oxidation zones,with a small amount of later hydrothermal alteration enrichment.

关 键 词：砂岩型铀矿 铀矿物学 地球化学 伊肯乌苏凹陷 巴丹吉林盆地 

分 类 号：P619.14[天文地球—矿床学]