铀矿地质2026，Vol.42Issue(5)：763-776,14.DOI:10.3969/j.issn.1000-0658.2026.42.059
鄂尔多斯盆地北西部特拉敖包矿床铀矿石地球化学特征分析
Analysis of Lithogeochemical Features of Uranium Ore of Tela'aobao Deposit in Northwestern Ordos Basin
摘要
Abstract
Tela'aobao deposit is the first super-large uranium deposit in Lower Cretaceous Huanhe Formation in the northern Ordos Basin,characterized by diverse uranium ore types and complex compositions.To reveal the genetic links and evolutionary patterns among different types of uranium ores,this study analyzed the petrological characteristics,uranium mineral features,and geochemical compositions of multiple uranium ore types from Tela'aobao deposit using optical microscopy,scanning electron microscopy,electron probe microanalysis,and major and trace element analysis.The results show that the uranium ores are predominantly buried at depths of 180-420 m,with grades ranging from 0.018 6%to 0.175 5%.Uranium minerals are mainly composed of tetragonal dipyramidal,acicular,or irregular coffinite,followed by Ti-Fe-U mixtures.The major element compositions are generally similar,but significant differences are observed in TFe2O3 contents,with purple ores having the highest Fe contents,followed by brownish-gray and gray ores,and brownish-green and greenish-brown ores having the lowest,which can serve as diagnostic indicators for ore type classification.Among trace elements,Zr,Zn,Cr,Pb,and Ba are relatively enriched.Rare earth element(REE)fractionation patterns show that purple and some gray and brownish-gray ores have LREE/HREE ratios of 0.28-3.72,indicating light REE depletion or weak enrichment,whereas greenish-brown,brownish-green,and brownish-gray ores have LREE/HREE ratios of 7.72-11.87,indicating significant light REE enrichment.Y shows systematic variations across different ore types,reflecting differences in redox conditions during their formation.Co,Ni,V,Pb,Cu,and Zn show significant correlations with U,while Cr exhibits two distinct trends.Based on the integrated petrogeochemical characteristics,it is concluded that the Tela'aobao uranium deposit was formed by multiple phases of ore-bearing fluids migrating as interlayer oxidation zones,resulting in the formation of multiple types of uranium ores.关键词
岩石地球化学/铀矿石/特拉敖包矿床/鄂尔多斯盆地北西部Key words
petrogeochemistry/uranium ore/Tela'aobao deposit/northwestern Ordos Basin分类
天文与地球科学引用本文复制引用
姜晓杰,鲁超,王龙辉,张锋,狄彦宁..鄂尔多斯盆地北西部特拉敖包矿床铀矿石地球化学特征分析[J].铀矿地质,2026,42(5):763-776,14.基金项目
中国核工业地质局地勘费项目"鄂尔多斯盆地北部鄂托克前旗—东胜地区铀矿资源调查评价与勘查"(编号:202201) （编号:202201）
内蒙古自治区"草原英才"项目"鄂尔多斯盆地北部铀资源成矿理论创新和铀矿大基地资源保障能力提升"联合资助 （）
