铀矿地质2026，Vol.42Issue(2)：315-327,13.DOI:10.3969/j.issn.1000-0658.2026.42.023
鄂尔多斯盆地镇原地区环河组下段铀镭平衡系数特征及其地质意义
Characteristics and Geological Significance of Uranium-radium Equilibrium Coefficient in the Lower Member of Huanhe Formation in Zhenyuan Area of Ordos Basin
摘要
Abstract
Uranium-radium equilibrium coefficient is an important parameter to measure the uranium-radium radioactive equilibrium state,which significantly reflect the migration and enrichment characteristics of uranium elements in uranium ore layers,and also an important parameter for gamma logging interpretation and resource volume modification.In this paper,the uranium ore samples from the lower member of Huanhe formation in Zhenyuan area were collected and used to calculate the uranium-radium balance coefficient and analyze the frequency curve characteristics of uranium-radium equilibrium of ores.The relationship of uranium-radium balance coefficient to uranium content,burial depth,ore grain size,geochemical environment and location of ore body were discussed.The geological factors and significance affecting the uranium-radium balance were analyzed.The study shows that the uranium-radium balance coefficients of the ore samples in the lower member of the Huanhe formation are between 0.23 and 1.5,with a weighted average value of 0.64,which conform to the normal distribution but bias to uranium in the equilibrium,suggesting that ore body has experienced oxidization and uranium migration by multi-stage mineralization.The uranium-radium balance coefficient of the ore is negatively correlated to the uranium content but positively to grain size.The balance coefficient of gray ore in the transition zone of oxidation and reduction is less than that of the yellow and brownish red ore in the oxidation zone.Ore layers in the three sedimentary circle of the lower member of Huanhe formation are uranium bias in uranium-radium balance with obviously enriched uranium,and the uranium mineralization has been forming to present.The vertical and horizontal change pattern of uranium-radium balance coefficient can not only show the migration and enrichment trend of deep ore fluid,but also the activity of groundwater and geochemical environment,and also benefit the analysis of geological factors controlling the the change of uranium-radium balance coefficient.Therefore,systematic study of uranium-radium balance coefficient is of great significance in analyzing the the genetic and evolutionary history of the deposits and guiding the deployment of uranium prospecting.关键词
铀镭平衡系数/规律研究/环河组下段/镇原地区/鄂尔多斯盆地Key words
uranium radium equilibrium coefficient/pattern research/lower member of Huanhe formation/Zhenyuan area/Ordos Basin分类
天文与地球科学引用本文复制引用
李磊,王伟,武正乾,刘坤鹏,冯博,刘凯鹏..鄂尔多斯盆地镇原地区环河组下段铀镭平衡系数特征及其地质意义[J].铀矿地质,2026,42(2):315-327,13.基金项目
中国核工业地质局项目"鄂尔多斯盆地南部旬邑-盐池地区铀矿资源调查评价与勘查"(编号:2022-17)资助. （编号:2022-17）
