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| Constraints on the REE Enrichment-fractionation in Weathering Crust by the Mineral Evolution in the Weathering and Leaching Processes: A Case Study of the Renju REE Deposit in the Meizhou Area, Guangdong, China |
| LIU En-hao1,2, HUANG Jian1,2, TAN Wei1, LIANG Xiao-liang1, MA Ling-ya1* |
1. CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry,Guangzhou 510640, China;
2. University of Chinese Academy of Sciences,Beijing 100049, China |
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Abstract The ion-adsorption REE deposits in South China are the main sources of MREE and HREE in the world. Understanding the mineralization mechanism and REE speciation of the ion-adsorption REE deposit may shed lights on the efficient prospecting and utilization of such type of REE resources. In order to explore the constraint mechanism on the enrichment and fractionation of REEs in weathering crust by the mineral evolution in the weathering process, in this paper, we have conducted mineralogical and geochemical studies of the bedrock and regolith of the Renju ion-adsorption REE deposit in the Meizhou area, Guangdong, China. The results show that the regolith and its bedrock of the Renju deposit are relatively enriched with LREE. From the bedrock towards the REE-enriched horizon, the contents of ion-exchangeable REEs are gradually increased. LREE-rich minerals including titanite, apatite and others are disappeared in the completely weathered horizon. Titanite was the main source of REEs in weathered crust, and its released REEs by weathering were mainly adsorbed by kaolinite and halloysite in form of ion-exchangeable REEs. The Fe-Mn oxide could be one of factors resulted in the fractionation of LREE and HREE and of Ce and other REEs among various horizons in the deposit.
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Received: 08 March 2022
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