物探与化探2025，Vol.49Issue(5)：1080-1089,10.DOI:10.11720/wtyht.2025.1314
二连盆地芒来铀矿床铀镭平衡系数特征研究
Characteristics of U-Ra equilibrium coefficients in the Manglai uranium deposit,Erlian Basin
摘要
Abstract
The uranium-radium(U-Ra)equilibrium coefficient is a significant correction parameter for the resource and reserve estima-tion of in situ leached(ISL)sandstone uranium deposits,directly influencing the accuracy and scientificity of such estimations.Em-ploying a high-purity germanium gamma-ray spectrometer,this study determined the U and Ra contents of 1 431 samples from the Man-glai uranium deposit in the Erlian Basin,yielding U-Ra equilibrium coefficients for these samples.Statistical analyses were performed on the U-Ra equilibrium coefficients in terms of frequency distribution,U content,grain size,lithology,and spatial distribution,to ex-plore the primary factors influencing the changes in U-Ra equilibrium coefficients and their implications.The results indicate that the Manglai uranium deposit showed a U-Ra equilibrium coefficient of 0.85,suggesting that the deposit is significantly richer in U.The U-Ra equilibrium coefficient was negatively correlated with U's concent and grade.Additionally,the U-Ra equilibrium coefficient exhibi-ted distinct vertical zoning within ore bodies.Within uranium-mineralized sand bodies,the most favorable grain sizes were observed in sandy conglomerates,coarse-and fine-grained sandstones.The presence of grayish-black and dark black mudstones contributed to ura-nium enrichment and mineralization in adjacent mineralized sand bodies.The block I-1 in the southern main ore body exhibits signifi-cant uranium enrichment potential and the highest U enrichment degree.The uranium deposit is overall richer in U,with almost no Ra-richer zones,indicating that the uranium deposit experienced minimal oxidative transformation after its formation.The results of this study provide a scientific basis for the subsequent construction arrangement of in situ leaching at the Manglai uranium deposit while con-tributing to a deeper understanding of the deposit's mineralization regularity.关键词
芒来铀矿床/铀镭样品/铀镭平衡系数/偏铀/铀富集Key words
Manglai uranium deposit/uranium and radium samples/U-Ra equilibrium coefficient/U-richer/U enrichment分类
天文与地球科学引用本文复制引用
熊攀,王伟,秦彦伟,李鹏,陈鸣新,田浩宇,刘波..二连盆地芒来铀矿床铀镭平衡系数特征研究[J].物探与化探,2025,49(5):1080-1089,10.基金项目
中国核工业地勘基金项目"内蒙古巴音戈壁盆地及周缘铀矿资源调查评价与勘查"(202203)、"内蒙古苏尼特左旗巴彦图古日格-阿巴嘎旗那仁地区铀矿普查"(202302-2) （202203）
