地质学报2023，Vol.97Issue(11)：3535-3549,15.DOI:10.19762/j.cnki.dizhixuebao.2023268
白云鄂博矿床钍富集过程及空间分布规律
Thorium enrichment process and spatial distribution in the Bayan Obo deposit
摘要
Abstract
Bayan Obo deposit is a large Fe-REE polymetallic deposit with large thorium resources.However,iron and rare earth resources are the main minerals developed and utilized at present,while thorium resources are almost used up.For the development and utilization of thorium resources in the future,it is important to find the occurrence state and distribution law of thorium resources in ore deposits and reveal the enrichment process and mechanism of thorium resources.In this paper,based on the results of systematic sampling,analysis and testing in recent years,detailed mineralogical observation and whole-rock chemical analysis were carried out on 570 samples from Baiyunebozhu,East and west mining areas.Independent thorium minerals,mainly silicorite,were identified in different types of ores.Silicorite,except a small amount of which were coated by rare earth minerals,is usually interspersed in rare earth minerals in the form of veins.It shows the characteristics of lag enrichment.The average grade of ThO2 in the mining area is 0.0322％,which is more than 30 times higher than the Clark value of the crust(9.6× 10-6).There are obvious differences in ThO2 content among various ore types,and high ThO2 content is distributed in mica,amphibole,girine and fluorite ores.The low content of ThO2 in dolomite ore indicates that thorium mineralization is mainly formed in alkaline hydrothermal metasomatism and fluorination.In addition,thorium mineralization is enhanced with the increase of depth,which indicates that the deposit has good thorium ore-forming potential.关键词
钍资源/富集过程/分布规律/成矿潜力/白云鄂博矿Key words
thorium resource/enrichment process/spatial distribution/metallogenic potential/Bayan Obo deposit引用本文复制引用
陈彪,魏威,刘雁江,孙庆,宋文磊,金海龙,李强,候少春,王其伟,杨占峰,贾晓琪..白云鄂博矿床钍富集过程及空间分布规律[J].地质学报,2023,97(11):3535-3549,15.基金项目
本文为国家重点研发计划项目(编号2020YFC1909100、2021YFC2901704、2022YFC2905300),内蒙古自治区自然科学基金面上项目(编号2021MS04004)和白云鄂博稀土资源与综合利用国家重点实验室专项(编号2021Z2349、2022Z2406)联合资助的成果. （编号2020YFC1909100、2021YFC2901704、2022YFC2905300）
