铀矿地质2026，Vol.42Issue(2)：229-249,21.DOI:10.3969/j.issn.1000-0658.2026.42.017
准噶尔盆地车排子铀矿产地元素地球化学特征及其地质意义
Geochemical Characteristics of Elements and Their Geological Significance of Chepaizi Uranium Occurrence,Junggar Basin
摘要
Abstract
In order to reveal the weathering degree,source properties,tectonic background and mineralization process of source rocks in Chepaizi uranium occurrences of Junggar Basin,elemental geochemical studies were carried out in this paper.The results show that:Sedimentary rock samples from Shawan Formation,Taxihe Formation,and Dushanzi Formation in Chepaizi uranium occurrence have SiO2 contents ranging from 40.70%to 78.70%(averaging 53.71%),Al2O3contents ranging from 4.72%to 15.60%(averaging 11.63%),and are characterized by high K2O/Na2O ratios(averaging 1.46).In the mineralized sandstones,the contents of SiO2,FeO/Fe2O3,and CaO,as well as the loss on ignition,are significantly increased,while the contents of Al2O3,Fe2O3,and MgO are relatively decreased,indicating that significant redox reactions occurred during the uranium mineralization process.The average w(LREE)/w(HREE)ratio is 10.39,showing a marked fractionation between light and heavy rare earth elements.The chemical weathering degree(average CIA index value is 73.83)in the source area is moderate and the source is dominated by neutral igneous rocks with dual sources from the north and the south(Zaire Mountains and Tianshan Mountains),and the tectonic background is the continental island arc.The uranium mineralized belt are simultaneous enriched in Mo,Re,Co and Se which is obviously different from the typical zonation of Mo,Se and Re in the phreatic or interlayer oxidation sandstone uranium deposits.The sandstone-type uranium deposits in Chepaizi uranium occurrence were formed in a weak oxidation-reduction transition environment,which have some difference to the typical interlayer oxidation uranium deposit,while have some characteristics of the"seepage"uranium metallogenic model.关键词
元素地球化学/物源/砂岩型铀矿/车排子/准噶尔盆地Key words
elemental geochemistry/provenance/sandstone-type uranium deposits/Chepaizi/Junggar Basin分类
天文与地球科学引用本文复制引用
龙敏,欧光习,邱林飞,周宏伟,毛广振,尹松..准噶尔盆地车排子铀矿产地元素地球化学特征及其地质意义[J].铀矿地质,2026,42(2):229-249,21.基金项目
天然铀产业技术创新联合体"揭榜挂帅"项目(编号:202301)和中核集团青年英才项目(编号:地QNYC2402)联合资助. （编号:202301）
