Variation in the structural order of kaolinite in regolith as an effective indicator of REE mineralization
文献类型：期刊论文
| 作者 | Luo, Lianying1,2,3; Tan, Wei1,2; Qin, Xiaorong1,2,3; Ji, Shichao1,2; Liang, Xiaoliang1,2,3 ; He, Hongping1,2,3
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| 刊名 | CLAYS AND CLAY MINERALS
 |
| 出版日期 | 2024-06-03 |
| 卷号 | 72页码:12 |
| 关键词 | halloysite kaolinite regolith-hosted REE deposit structural order X-ray diffraction |
| ISSN号 | 0009-8604 |
| DOI | 10.1017/cmn.2024.1 |
| 英文摘要 | Regolith-hosted rare earth element (REE) deposits hosted by the granitic regolith in South China provide >90% of the world's heavy REEs. Kaolinite is one of the major carriers of REE ions in regolith. The formation and transformation of kaolinite can be affected by chemical weathering and hydrodynamic conditions, but the contribution of each factor has not been evaluated. This study systematically investigated the variation in abundance of phyllosilicate minerals and structural order of kaolinite in the Renju regolith-hosted REE deposit. The total abundance of 1:1 phyllosilicate minerals increased upwards along the profile from Section I to Section III. However, semi-quantitative analyses indicated that Section III-1 (depth at 10-16 m) featured an evident decrease in both abundance and structural order of kaolinite upward along the profile. The morphological feature and abundance of kaolinite revealed intensive kaolinite-to-halloysite transformation and kaolinite dissolution in Section III-1. This suggests that the alternating wetting and drying zone in Section III-1 provided a favorable kinetic environment for the entry of water molecules into the kaolinite interlayer and the kaolinite-to-halloysite transformation, resulting in both lower structural order and abundance of kaolinite in Section III-1. Moreover, REE ions started to be enriched from the alternating wetting and drying zone and formed high-grade ores at the lower part of the water table, due to a significant increase in pore water and decrease in the seepage velocity. Therefore, the abundance and structural order of secondary kaolinite can serve as important indicators of hydrodynamic changes in regolith, as well as the mineralization of regolith-hosted REEs. |
| WOS研究方向 | Chemistry ; Geology ; Mineralogy ; Agriculture |
| 语种 | 英语 |
| WOS记录号 | WOS:001239692600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78486]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Tan, Wei |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou, Peoples R China 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Luo, Lianying,Tan, Wei,Qin, Xiaorong,et al. Variation in the structural order of kaolinite in regolith as an effective indicator of REE mineralization[J]. CLAYS AND CLAY MINERALS,2024,72:12. |
| APA | Luo, Lianying,Tan, Wei,Qin, Xiaorong,Ji, Shichao,Liang, Xiaoliang,&He, Hongping.(2024).Variation in the structural order of kaolinite in regolith as an effective indicator of REE mineralization.CLAYS AND CLAY MINERALS,72,12. |
| MLA | Luo, Lianying,et al."Variation in the structural order of kaolinite in regolith as an effective indicator of REE mineralization".CLAYS AND CLAY MINERALS 72(2024):12. |
入库方式： OAI收割
来源：广州地球化学研究所
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