Influence of Clay Minerals on Rare Earth Element Enrichment in Weathering Crusts: A Case Study of the Maofeng Weathering Profile

被引：0
|
作者：
Xu J. [1 ,2 ,3 ]
Huang W. [4 ]
Wang G. [1 ,2 ]
Xu Y. [1 ,2 ,3 ]
Wei J. [1 ,2 ,3 ]
Zhu J. [1 ,2 ,3 ]
He H. [1 ,2 ,3 ]
机构：
[1] CAS Key Laboratory of Mineralogy and Metallogeny, Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangdong, Guangzhou
[2] CAS Center for Excellence in Deep Earth Science, Guangdong, Guangzhou
[3] University of Chinese Academy of Sciences, Beijing
[4] Rising Nonferrous Metals Co., Ltd, Guangdong, Guangzhou
来源：
Geotectonica et Metallogenia | 2024年 / 48卷 / 02期
关键词：
clay minerals; enrichment; halloysite; ion-adsorption rare earth deposit; kaolinite;
D O I：
10.16539/j.ddgzyckx.2024.02.007
中图分类号：
学科分类号：
摘要：
In ion-adsorption rare earth deposits, rare earth elements (REE) are adsorbed on clay minerals, predominantly on kaolinite and halloysite. However, because of their similar structures, accurate and quantitative distinction of kaolinite and halloysite by conventional methods is unlikely. Thus, the contribution of various clay minerals to REE enrichment cannot be accurately determined. In this study, we semi-quantitatively distinguish the compositions of kaolinite and halloysite in a Maofeng weathering crust using formamide treatment. We compared the adsorption capacities of various clay minerals for REE using simulated adsorption experiments. Combined with the isothermal adsorption model, the REE adsorption mechanism of clay minerals is revealed. Furthermore, the contribution of various clay minerals to REE enrichment at different depths of the weathering profile is quantified through theoretical calculations. The results suggest that kaolinite contributes the most to REE enrichment in the fully weathered regolith layer, halloysite contributes the most to REE enrichment in the semi-weathered regolith layer and the topsoil layer, and kaolinite, halloysite, and illite contribute to REE enrichment in the semi-weathered regolith layer. This work semi-quantitatively distinguishes the mineral compositions of halloysite and kaolinite, providing an easy method for the mineralogy quantitative analysis of weathering crusts. It also quantifies the contribution of various clay minerals to REE enrichment in weathering crusts, which advances our understanding of the REE enrichment mechanism in weathering crusts. © 2024 Science Press. All rights reserved.
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页码：270 / 282
页数：12
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