地质与资源2025，Vol.34Issue(3)：291-301,360,12.DOI:10.13686/j.cnki.dzyzy.2025.03.003
松辽盆地西部斜坡区姚家组和四方台组含铀砂岩地球化学特征
Geochemistry of uranium-bearing sandstones of Yaojia Formation and Sifangtai Formation in the western slope of Songliao Basin
摘要
Abstract
The paper comprehensively studies the sedimentary environment,tectonic setting,provenance,and their relationship with uranium mineralization in the uranium-bearing strata of Yaojia Formation and Sifangtai Formation in the western slope of Songliao Basin,and analyzes the major,trace,and rare earth elements(REEs)in 30 samples from six representative boreholes.The results show that the ore-hosting clastic rocks are predominantly feldspar lithic sandstone,characterized by various SiO2 contents,rich alkali,and high contents of Al,Mg and Ca,with low ΣREE(70.08×10-6-211.33×10-6),LREE fractionation factor(La/Sm)N of 2.32-3.96,HREE fractionation factor(Gd/Yb)N of 1.54-3.25,and moderately negative Eu anomaly.The index of compositional variability(ICV)(0.54-2.30,averagely 0.84)and chemical index of alteration(CIA)values(41.08-68.96,averagely 61.77)of the sandstone reflect moderate chemical weathering in the source area under arid to semi-arid climatic conditions.The discrimination diagrams of source rock indicate that the provenance is dominated by felsic rocks,with minor contributions from ancient sedimentary materials.The discrimination diagrams of major and trace elements suggest that the sandstones of Yaojia and Sifangtai formations are derived from the active continental margin tectonic setting,with provenance primarily from the acidic igneous-sedimentary rock series developed in Daxinganling Mountains.关键词
铀矿/地球化学/姚家组/四方台组/松辽盆地Key words
uranium deposit/geochemistry/Yaojia Formation/Sifangtai Formation/western slope/Songliao Basin分类
天文与地球科学引用本文复制引用
李研,李明阳,刘晓辉..松辽盆地西部斜坡区姚家组和四方台组含铀砂岩地球化学特征[J].地质与资源,2025,34(3):291-301,360,12.基金项目
中国核工业地质局项目"松辽盆地北部泰来-拜泉地区铀矿资源调查评价"(202125) （202125）
国防科工局核能开发项目"松辽盆地砂岩型铀矿综合预测评价技术研究"(20171403). （20171403）
