赣南花岗岩风化壳型稀土矿床中纳米级稀土矿物的研究

为揭示次生风化成因稀土矿物的赋存形态和分布特征,对赣南安远岗下稀土矿区花岗岩风化壳剖面进行了研究。采集风化壳不同层位的样品进行分选、提纯,场发射扫描电镜和透射电镜研究结果表明,与稀土矿物紧密相关的粘土矿物是高岭石和埃洛石等,风化壳中发现的纳米级稀土矿物既有附着于其他矿物表面的微细颗粒,也有呈集合体存在的稀土矿物(可能为方铈石),这一现象有助于进一步认识风化壳稀土矿床的形成过程。

Nano-sized rare earth minerals from granite-related weathering-type REE deposits in southern Jiangxi

In this paper, the authors investigated rare earth minerals in the weathering granite crust of the Gangxia REE deposit in Anyuan, southern Jiangxi, with the purpose of revealing the morphology and distribution of secondary weathering-related rare earth minerals. Samples collected from different layers of the studied weathering crust were purified by separation. The main clay minerals closely related to rare earth minerals are kaolinite and halloysite. FE-SEM and TEM results indicate that, in this profile, nano-sized REE-bearing minerals occur in two modes: some micro-grains are attached on the surface of some minerals, whereas others exist as aggregates of rare earth minerals(possibly cerianite). The results help to understand the process of secondary enrichment of rare earth elements during weathering of granites in South China.