铀矿地质2025，Vol.41Issue(4)：551-569,19.DOI:10.3969/j.issn.1000-0658.2025.41.039
鄂尔多斯盆地特拉敖包铀矿床砂岩岩石-地球化学特征及其对铀成矿的指示
Petrological-geochemical Characteristics of Sandstone in Teraaobao Uranium Deposit of Ordos Basin and Their Implications for Uranium Mineralization
摘要
Abstract
Lower Cretaceous Huachi-Huanhe Formation in the northwest Ordos Basin has recently been identified as a"new horizon"for uranium prospecting.The mineralized sand bodies of the Teraaobao uranium deposit are primarily located in the lower member of Huachi-Huanhe Formation,with ore bodies predominantly exhibiting stratiform morphology.However,systematic studies on the geological characteristics and metallogenic conditions of Teraaobao uranium deposit are few.At present,making the internal mechanisms of uranium enrichment remain unclear.This study conducted a comprehensive analysis of elemental geochemistry,carbon and oxygen isotopes,and whole-rock U-Pb dating on the mineralized sandstone layers to meticulously analyze the provenance of the sandstone and the origin of carbonates within the uranium ore layers.The results indicate that the primary provenance of the sandstone in Lower Cretaceous Huachi-Huanhe Formation is intermediate-acid igneous and metamorphic rocks from Yinshan mountain range.Notably,there is no direct correlation between carbonates and uranium mineralization.Instead,minerals such as pyrite,chlorite,and ilmenite play crucial roles as important uranium-adsorbing and reducing agents during the uranium mineralization process.Additionally,the sandstone of Huachi-Huanhe Formation has undergone reduction transformation by hydrocarbon-bearing fluids,a process closely associated with uranium mineralization.This new discovery provides fresh perspectives and insights for a deeper understanding of the uranium metallogenic mechanisms in Teraaobao uranium deposit.关键词
下白垩统/华池-环河组/物源/铀成矿作用/特拉敖包铀矿床/鄂尔多斯盆地Key words
Lower Cretaceous/Huachi-Huanhe Formation/provenance/uranium mineralization/Teraaobao uranium deposit/Ordos Basin分类
天文与地球科学引用本文复制引用
韩美芝,李子颖,邱林飞,张字龙,王龙辉..鄂尔多斯盆地特拉敖包铀矿床砂岩岩石-地球化学特征及其对铀成矿的指示[J].铀矿地质,2025,41(4):551-569,19.基金项目
国家自然科学基金重点基金(编号:U2167210) （编号:U2167210）
中核集团青年英才项目(编号:地QNYC2402) （编号:地QNYC2402）
中国核工业地质局项目(编号:202545-1)联合资助. （编号:202545-1）
