Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
Wang, Yuanyuan1,2,3; Liu, Liu4; Sun, Mingqi1,2,3; Huang, Jian1,2,3; Huang, Yufeng1,2,3; Liang, Xiaoliang1,2,3 ; Tan, Wei1,2,3; He, Hongping1,2,3; Zhu, Jianxi1,2,3
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| Distribution and Fractionation of Rare Earth Elements (REE) in the Ion Adsorption-type REE Deposit (IAD) at Maofeng Mountain, Guangzhou, China | |
| Source Publication | CLAYS AND CLAY MINERALS
 |
| ISSN | 0009-8604 |
| 2023-06-01 | |
| Volume | 71Issue:3Pages:340-361 |
| DOI | 10.1007/s42860-023-00251-7 |
| Language | 英语 |
| WOS Research Area | Chemistry ; Geology ; Mineralogy ; Agriculture |
| Abstract | Ion adsorption-type rare earth deposits (IADs) are developed via prolonged weathering of REE-rich volcanic and metamorphic rocks. Intense magmatic activity which occurred during the Yanshanian (199.6-65.5 Ma) and Caledonian periods (542-359.2 Ma) provided an abundant material basis for the formation of IADs in South China. High concentrations of REE and the high proportion of ion-exchangeable REE were found in the Maofeng Mountain regolith, Guangzhou city. However, the geochemical patterns and mechanisms of REE enrichment in the regolith were still poorly understood. The present study investigated the regolith profile (0-8 m) developed in Maofeng Mountain based on metallogenic and geochemical characteristics, sequential extraction, and physical and chemical parameters of the regolith profile. The bedrock contained abundant REE resources (245-287 mg kg-1) and the chondrite-normalized REE patterns showed the enrichment of light REE (LREE) and negative cerium (Ce) and europium (Eu) anomalies. The distribution patterns of REE in the bedrock were inherited by the regolith. REE enrichment of the regolith occurred mainly in the completely weathered layer (B1, B2, and B3 horizons), particularly in the depth range 2.5-4.5 m (849-2391 mg kg-1). The position of REE enrichment was controlled by the soil pH (5.52-6.02), by the amount of kaolinite and halloysite, and by the permeability of the metamorphic rock. In the REE-enriched horizon (2-8 m), the REE were hosted mainly in ion-exchangeable fractions (75-2158 mg kg-1), representing 79% of the total REE. Given the pH of 4.73-6.02, REE fractionation driven by the adsorption of kaolinite was limited. Fe-Mn (oxyhydr)oxides played an important role in REE enrichment and the reducible fraction holds up to 21% (139 mg kg-1) of the total REE. The enrichment of LREE was observed in the reducible fraction potentially because of the preferential release of LREE from the LREE-bearing minerals (monazite) and then scavenged by Fe-Mn (oxyhydr)oxides. Positive Ce anomalies (Ce/Ce*: 10) were found in the reducible fraction because trivalent Ce was oxidized by Fe-Mn (oxyhydr)oxides to cerianite (CeO2). The present study helps to understand the enrichment and fractionation of REE in the IADs of South China. |
| Keyword | Ion adsorption-type rare earth deposits Rare earth elements REE enrichment REE fractionation |
| WOS ID | WOS:001064530200001 |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/74853 |
| Collection | 中国科学院矿物学与成矿学重点实验室 |
| Corresponding Author | Zhu, Jianxi |
| Affiliation | 1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Guangdong Nonferrous Met Geol Explorat Inst, Guangzhou 510080, Peoples R China |
| Recommended Citation GB/T 7714 | Wang, Yuanyuan,Liu, Liu,Sun, Mingqi,et al. Distribution and Fractionation of Rare Earth Elements (REE) in the Ion Adsorption-type REE Deposit (IAD) at Maofeng Mountain, Guangzhou, China[J]. CLAYS AND CLAY MINERALS,2023,71(3):340-361. |
| APA | Wang, Yuanyuan.,Liu, Liu.,Sun, Mingqi.,Huang, Jian.,Huang, Yufeng.,...&Zhu, Jianxi.(2023).Distribution and Fractionation of Rare Earth Elements (REE) in the Ion Adsorption-type REE Deposit (IAD) at Maofeng Mountain, Guangzhou, China.CLAYS AND CLAY MINERALS,71(3),340-361. |
| MLA | Wang, Yuanyuan,et al."Distribution and Fractionation of Rare Earth Elements (REE) in the Ion Adsorption-type REE Deposit (IAD) at Maofeng Mountain, Guangzhou, China".CLAYS AND CLAY MINERALS 71.3(2023):340-361. |
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