铀矿地质2025，Vol.41Issue(5)：869-883,15.DOI:10.3969/j.issn.1000-0658.2025.41.060
四川会理芭蕉箐1841地区钠交代型铀矿成矿特征与成因探讨
Discussion on Metallogenic Characteristics and Genesis of Sodium Metasomatism Type Uranium Deposits in Bajiaoqing 1841 Area,Huili,Sichuan
摘要
Abstract
Sodium metasomatic uranium mineralization is one of the profitable uranium deposit types in the world,which has been found in many areas of China.The uranium occurrence No.1841 in Bajiaoqing area of Huili,Sichuan,is mainly hosted in metasomatic albite and fall in the typical sodium metasomatic type uranium deposit,but few the research is reported on its metallogenic characteristics and genesis.This paper systematically analyzes its petrography,mineralography,mineralogy and element geochemistry,U-Pb isotope characteristics of pitchblende,and discusses the mineralization genesis of uranium occurrence No.1841 in Bajiaoqing area.The results show that the Na2O mass fraction of uranium occurrence host metasomatic albite is 4.62％-8.71％,with an average of 7.28％,albite take up 66％-83％of the content and the plagioclase number An is 0.08-0.86,with an average of 0.31,which is close to pure albite.The uranium mainly occurs in the form of independent uranium minerals,mainly brannerite,with a small amount of uraninite and coffinite.From the perspective of ore element association,uranium ore is a U-Cu polymetallic mineralization.The mineralization age of copper is 1 698 Ma±3 Ma,and the mineralization age of uranium is 857 Ma±11 Ma.The copper mineralization and uranium mineralization are only symbiotic in space,and there is no direct genetic relationship.The uraninite in the Bajiaoqing 1841 area has a very high total rare earth elements content(with an average value of 14 935×10-6),a very high U content(with an average value of 426 804×10-6),and an extremely low Th content(with an average value of 16.06×10-6),and the U/Th value is as high as of 18 191-34 654.Comprehensive analysis shows that the uranium mineralization in the area should be derived from the deep uranium-rich high-temperature sodium-bearing fluid which ascended along the fault zone and metasomatized the dolomite and diabase on both sides of the fault zone,ultimately produced the uranium-rich metasomatic albite rocks.关键词
钠交代型铀矿/成矿特征/矿化成因/芭蕉箐1841地区Key words
sodium metasomatism type uranium deposit/metallogenic characteristics/mineralization genesis/Bajiaoqing 1841 area分类
天文与地球科学引用本文复制引用
朱一番,陈友良,王凤岗,姚建,危隆隆,黄露玉..四川会理芭蕉箐1841地区钠交代型铀矿成矿特征与成因探讨[J].铀矿地质,2025,41(5):869-883,15.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)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. （编号:42072096）
