铀矿地质2026，Vol.42Issue(1)：95-111,17.DOI:10.3969/j.issn.1000-0658.2025.42.007
四川米易海塔地区长英质脉地质地球化学特征及其对铀成矿的指示意义
Geological and Geochemical Characteristics of Felsic Veins in Haita Area,Miyi,Sichuan:Implications for Uranium Mineralization
摘要
Abstract
Uranium mineralization in Haita area,Miyi,Sichuan is primarily hosted within felsic veins proximal to the contact zone between Jinningian migmatitic granites and Proterozoic metamorphic rocks.Felsic veins in this region are diverse and widespread in occurrence,but the difference between uranium-mineralized and barren veins remain unstudied in mineral assemblages and major/trace element compositions.This integrated petrographic and geochemical analyses demonstrate that:Mineralized veins(U≥100×10-6)are dominated by feldspar(average content 79%)with subordinate quartz(average content 12%).Uranium-enriched veins(20×10-6≤U＜100×10-6)contain comparable feldspar(average content 47%)and quartz(average content 41%).Common veins(U＜20×10-6)exhibit quartz dominance(average content 50%)over feldspar(average content 44%).Mineralized veins are characterized by low silica(SiO2 mean 62.7%),elevated sodium(Na2O mean 5.83%)and alumina(Al2O3 mean 22.55%),with significant enrichment of U,Mo,Bi,Th,Be,and Pb.Critically,the diagnostic triad of feldspar predominance(＞75%),quartz deficiency(＜20%),and Na-Al enriched signatures provides robust exploration indicators for uranium-prospective felsic veins.关键词
长英质脉/岩相学/元素地球化学/成矿意义/海塔地区Key words
felsic veins/petrography/element geochemistry/metallogenic significance/Haita area分类
天文与地球科学引用本文复制引用
黄露玉,陈友良,郭俏萍,薛勇,朱一番,姚建,危隆隆,赵静..四川米易海塔地区长英质脉地质地球化学特征及其对铀成矿的指示意义[J].铀矿地质,2026,42(1):95-111,17.基金项目
国家自然科学基金项目"康滇地轴中南段新元古代钠长岩型铀矿成矿机理研究"(编号:42072096) （编号:42072096）
四川省财政出资地质勘查项目"四川省冕宁-会理地区Y(钍)资源富集规律基础调查"(编号:DZ202421) （钍）
中国核工业地质局重点科研项目"康滇地轴前寒武纪地质构造演化及其对铀成矿的制约"(编号:2023-16)联合资助. （编号:2023-16）
