矿床地质2026，Vol.45Issue(2)：405-418,14.DOI:10.16111/j.0258-7106.2026.02.011
利用铀镭平衡系数计算第四纪以来的铀成矿年龄
Using uranium-radium equilibrium coefficients to calculate uranium mineraliza-tion ages since Quaternary period
摘要
Abstract
Uranium mineralization of sandstone type uranium deposits often exhibits multi-period and multi-stages.In addition,different from the silicate minerals such as zircon and apatite,uranium minerals have low closure tem-peratures which means U and Pb are easier to migrate.Therefore,uranium mineralization dating has always been a difficult issue in the study of sandstone type uranium deposits.In recent years,uranium exploration has discov-ered industrial uranium ore bodies in young strata,such as the Neogene and even the Quaternary,indicating the existence of very young uranium mineralization.How to accurately determine the time limits of such young urani-um mineralizations is urgent to be solved.Uranium-radium equilibrium coefficient is a physical parameter that must be measured during uranium exploration with great significance for accurately estimating the uranium re-sources.As a type of radioactive equilibrium coefficient,uranium-radium equilibrium coefficient is a function of time from the formation of uranium ore until uranium-radium reaches equilibrium.Therefore,under certain condi-tions,the uranium-radium equilibrium coefficient can be used to accurately calculate the age of uranium mineral-ization.This study has established a functional relationship between the uranium-radium equilibrium coefficient and the age of uranium mineralization through mathematical derivation.The uranium-radium equilibrium coeffi-cients(Kp=0.69,n=62)of uranium ores from the Cretaceous sandstones in the Zhenyuan area,southern part of the Ordos Basin was used to calculate the uranium mineralization age of 0.127 Ma,which is close to the U-Pb iso-chron age of whole rocks((0.38±0.02)Ma).0.38 Ma may represent the beginning of the uranium mineralization,while 0.127 Ma may represent the end of the uranium mineralization.It is worth mentioned that uranium-radium equilibrium coefficients of many sandstone type uranium deposits in China and abroad are abviously less than 1,which indicates the explosion of a regional uranium mineralization since the Late Pleistocene.关键词
铀镭平衡系数/铀成矿作用/成矿年龄/砂岩型铀矿/鄂尔多斯盆地南部Key words
uranium-radium equilibrium coefficient/uranium mineralization/mineralization age/sandstone type uranium deposits/southern Ordos Basin分类
天文与地球科学引用本文复制引用
朱斌,贺锋,刘持恒,王铁健..利用铀镭平衡系数计算第四纪以来的铀成矿年龄[J].矿床地质,2026,45(2):405-418,14.基金项目
本文得到铀资源探采与核遥感全国重点实验室开放基金项目(编号:NKLUR-2024-YB-005)、核工业地质局铀矿地质勘查项目(编号:202406-9)、中核集团青年英才(菁英)项目(编号:地QNYC2403)和新疆维吾尔自治区重大科技专项(编号:2024A03003-2)联合资助 （编号:NKLUR-2024-YB-005）
