世界核地质科学2025，Vol.42Issue(4)：752-770,883,20.DOI:10.3969/j.issn.1672-0636.2025.04.006
四川米易海塔地区产铀长英质脉形成时代及其意义
Forming age and its geological significance of uranium mineralization host felsic veins in Haita area of Miyi,Sichuan province
摘要
Abstract
Migmatite-type uranium deposit is one of the most hopeful uranium deposits to be discovered in Kangdian geotectonic axis.Uranium mineralization in the Haita area of Miyi county in Sichuan province mainly occurs near the outer contact zone between the Jinning migmatitic granite and Proterozoic metamorphic-migmatite,and closely related spatially with felsic veins.However,the genetic affinity among the uranium mineralization,felsic veins,and migmatitic granite was poorly studied until present.This paper presented zircon LA-ICP-MS U-Pb dating and Lu-Hf isotopic analyses on uranium-producing felsic veins,and in situ uraninite LA-ICP-MS U-Pb dating in the Haita area.The results indicate that the uranium-producing felsic veins and Jinning migmatitic granite were the products of magmatic evolution and differentiation of the same parental magma,with relation to remelting and anatectic migmatization of the Paleoproterozoic crystalline basement.The forming ages of the uraninite,uranium-producing felsic veins,and Jinning migmatitic granite(Dingzhen complex)in Haita area were dated at 800±61 Ma,828±5～825±24 Ma,and 823±52 Ma,respectively,all of which are nearly identical within error.Their diagenetic ages are also similar to those ore-forming ages.Accordingly uranium mineralization was caused by anatectic migmatization during the mid-Neoproterozoic(～800 Ma).Meanwhile,high-grade uranium mineralization was attributed to the late-stage hydrothermal alterations overprinting on the felsic veins.In conclusion,uranium mineralization in this area experienced two major stages,anatectic migmatization mineralization and late-stage hydrothermal alterations.关键词
产铀长英质脉/晶质铀矿/形成时代/成因意义/海塔地区Key words
uranium-producing felsic veins/uraninite/forming age/metallogenic significance/Haita area分类
天文与地球科学引用本文复制引用
危隆隆,陈友良,郭俏萍,黄露玉,姚建,朱一番,赵静..四川米易海塔地区产铀长英质脉形成时代及其意义[J].世界核地质科学,2025,42(4):752-770,883,20.基金项目
国家自然科学基金"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)和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 Supported by National Natural Science Foundation of China(No.42072096)and key scientific research projects of China Nuclear Industry Geological Bureau"Tectonic Evolution of the Precambrian Kangdian Axis and its Constraints on Uranium Mineralization"(No.2023-16) （编号:42072096）
