矿床地质2025，Vol.44Issue(3)：696-706,11.DOI:10.16111/j.0258-7106.2024.06.000
四川大陆槽稀土矿床隐爆角砾岩矿化特征及意义
Mineralization characteristics and significance of cryptoexplosive breccia from Dalucao REE deposit
摘要
Abstract
The Dalucao REE(Rare Earth Elements)deposit is the second-largest rare earth deposit in the Panxi Mian-ning-Dechang REE metallogenic belt,following the Maoniuping deposit.The mineralization is closely associated with the Himalayan period carbonatite-alkaline syenite(porphyritic)intrusive complex,and characterized by the development of cryptoexplosive breccia-type ores.In recent years,the project team has discovered a hidden,thick ore body beneath the Quaternary strata between two main industrial ore bodies in the mining area.This not only confirms the deep connection between the two ore bodies,expanding the REE resources,but also reveals the ver-tical zoning characteristics of the REE ore bodies.From top to bottom in the drilling hole,the ore bodies transi-tion from thin veins and large veins to thick mineralized breccias and brecciated ores(not yet exposed),suggest-ing that the deeper part of the deposit has good potential for ore-formation.The cementing materials of the crypto-explosive breccias from the drilling hole can be divided into three categories:those dominated by calcite,those dominated by fluorite-celestite-calcite,and those dominated by quartz-fluorite-celestite.All three types of cement-ing materials contain fine to very fine grains of bastnaesite.The components of the breccias are complex,includ-ing both rock breccias such as quartz diorite and calcite carbonatite,as well as mineral breccias such as celestite and bastnaesite. The rare earth grade varies among different types of breccias.Factors such as lower breccia content,the su-perimposition of multiple mineralization events,and the development of mineralization alteration processes like luoritization and celestitization all contribute to the enhancement of rare earth grades in ores.Consequently,the identification of breccias with low breccia content and fluoritization-celestitizatio is of significant importance for the exploration and assessment of the Dalucao REE deposit.关键词
方解石碳酸岩/隐爆角砾岩/氟碳铈矿/大陆槽稀土矿床/四川省Key words
calcite carbonatite/cryptoexplosive breccia/bastnasite/Dalucao deposit/Sichuan Province引用本文复制引用
班西雨,刘善宝,赵芝,王伟,吕秉廷,何斌,于扬..四川大陆槽稀土矿床隐爆角砾岩矿化特征及意义[J].矿床地质,2025,44(3):696-706,11.基金项目
本文得到中国地质调查局"战略新兴产业矿产地质调查工程"(编号:DD20230034)、"四川康定-云南个旧稀有稀土矿产地质调查"项目(编号:DD20230290)、中国矿产地质志续编与产品服务项目(编号:DD20221695)和中国稀土集团有限公司科技项目"四川省牦牛坪、大陆槽稀土矿成矿规律与找矿预测"(编号:HE2310)共同资助 （编号:DD20230034）
