铀矿地质2025，Vol.41Issue(5)：773-785,13.DOI:10.3969/j.issn.1000-0658.2025.41.053
松辽盆地海力锦地区姚家组下段砂岩地球化学特征及其对铀成矿的指示意义
Geochemical Environment of the Lower Member of Yaojia Formation and Its Implications for Uranium Mineralization in Hailijin Area of Songliao Basin
摘要
Abstract
To clarify the uranium mineralization mechanism in Hailijin area of southern Songliao Basin,this paper systematically studied the geochemical characteristics of sandstones in the lower member of Yaojia Formation.The results show that three alteration zones were developed with different elements geochemical feature.In the strong oxidation zone,Fe³⁺ shows significant enrichment while Na⁺ and K⁺ exhibit partial depletion.In the weak oxidation zone,Ca²⁺ content reaches peak with preliminary enrichment of Si⁴⁺ and Al³⁺.In the transition zone from oxidation to reduction,Si⁴⁺,Al³⁺,S²⁻,and Fe²⁺ demonstrates enrichment accompanied by the depletion of Na⁺,Mg²⁺,K⁺,and Ti⁴⁺,presenting a distinctive"four enrichments and four depletions"elemental differentiation pattern,ultimately forming a gray sandstone uranium reservoir characterized by high Si-Al-S-Fe content.In the primary zone,Fe³⁺ content is lower than that in the strong oxidation zone but higher than in other zones;S²⁻ shows the opposite trend,while Si⁴⁺,Al³⁺,Na⁺,Mg²⁺,and Ti⁴⁺ remain stable with no obvious imigration or emigration.The geochemical characteristics of sandstones indicate the presence of mixed fluid processes in this area,involving the infiltration of surface oxidizing fluids and the exudation of deep reducing fluids.Such mixed fluid activities cause significant migration of major elements in sandstones,and their migration characteristics provide a basis for accurately locating uranium-enriched subzones in the oxidation-reduction transition zone.关键词
地球化学环境/层间氧化带/铀矿/松辽盆地/海力锦地区Key words
geochemical environment/interlayer oxidation zone/uranium ore/Songliao Basin/Hailijin area分类
天文与地球科学引用本文复制引用
武飞,蔡建芳,宁君,张亮亮,王常东,李继木,唐国龙,宫天琦,马树松..松辽盆地海力锦地区姚家组下段砂岩地球化学特征及其对铀成矿的指示意义[J].铀矿地质,2025,41(5):773-785,13.基金项目
中国核工业地质局铀矿地勘费项目"松辽盆地通辽市—大庆地区铀矿资源调查评价与勘查"(编号:202212)和"内蒙古科左中旗海力锦铀矿床勘查"(编号:202212-1)联合资助. （编号:202212）
