首页|白云鄂博主矿云母型矿石中钍矿物的赋存状态微观分析

白云鄂博主矿云母型矿石中钍矿物的赋存状态微观分析

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白云鄂博矿床赋存有丰富地钍资源,为更好地开发利用钍资源,本文采用SEM-EDS-AMICS联合分析测试技术结合化学分析法对主矿云母型矿石的化学成分、矿物组成、钍矿物赋存状态等进行系统研究.结果表明,云母型矿石化学成分和矿物组成复杂,矿石中铁品位为8.19%,稀土(RE2O3)品位为1.15%,钍(ThO2)品位达到0.21%,Th以独立矿物为主,少量呈类质同象形式赋存于独居石中.Th主要以独立矿物钍石的形式存在,矿物粒径分布在5~50 μm之间不等,呈浑圆状、他形粒状结构,主要嵌布于云母、方解石等脉石矿物粒间,部分钍石与稀土矿物紧密共生,赋存于独居石颗粒边界,少量呈现包裹与被包裹的特征或以细脉状充填于独居石裂隙中.矿区钍石与稀土矿物独居石及晚期硫化物方铅矿、磁黄铁矿脉体的复杂共伴生关系表明,矿区经历了多期次的热液作用从而导致了现今复杂的钍矿化现象.
Microanalysis of occurrences of thorium minerals in mica-type ore of the main orebody in the Bayan Obo deposit
There is abundant thorium resource in the Bayan Obo deposit.In order to better develop and utilize the thorium resource,the chemical composition,mineral composition,and thorium mineral occurrence states of the mica-type ore of the main orebody in the mine have been systematically studied by using the SEM-EDS-AMICS technique combined with chemical analysis in this paper.The results show that the mica-type ores have complicated chemical compositions and mineral components,with iron grade of 8.19%,rare earth grade(RE2O3)of 1.15%,and thorium grade(ThO2)of 0.21%,respectively.Th occurred mainly in form of independent minerals.A small amount of Th occurred in form of isomorphism in monazite.Th mainly occurred in the form of independent mineral of thorite.Its particles have sizes ranging from 5μm to 50pm,with round and anhedral granular textures.Its particles were mainly embedded in the intergranular of gangue minerals such as mica and calcite.Some thorite particles are closely associated with rare earth minerals as they occured in the boundary of monazite grains,with a small amount of them encapsulated and enclosed in monzite or infilled in form of veinlets in monazite fissures.The complicated intergrowth and associated relationships among thorite,monazite and late-stage sulfide veins of galena and pyrrhotite in the deposit indicated that the complicated thorium mineralization phenomena in the deposit were resulted from multi-stages hydrothermal fluids.

AMICSScanning electron microscopeBayan Obothoriumoccurrence state

陈彪、金海龙、贾晓琪、孙庆、候少春、王振江

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包头稀土研究院白云鄂博稀土资源研究与综合利用全国重点实验室,内蒙古自治区包头 014030

AMICS 扫描电镜 白云鄂博 赋存状态

国家重点研发计划内蒙古自治区自然科学基金面上项目白云鄂博稀土资源研究与综合利用全国重点实验室专项白云鄂博稀土资源研究与综合利用全国重点实验室专项

2021YFC2901704:2022YFC29053002021MS040042021Z23492022Z2406

2024

矿物学报
中国矿物岩石地球化学学会 中国科学院地球化学研究所

矿物学报

CSTPCD北大核心
影响因子:1.2
ISSN:1000-4734
年,卷(期):2024.44(2)
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