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| Enrichment Mechanism, Occurrence State and Availability of REEsin the Zhijin Phosphorite Deposit, Guizhou, China |
| XING Jie-qi1,2,3, ZHANG Ze-yang1,2,3, XIAN Hai-yang1,2, JIANG Yu-hang1,2, LIANG Xiao-liang1,2,3, TAN Wei1,2, NIU He-cai1,2, HE Hong-ping1,2,3, ZHU Jian-xi1,2,3* |
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,Guangzhou 510640, China;
2. CAS Center for Excellence in Deep Earth Science,Guangzhou 510640, China;
3. University of Chinese Academy of Sciences,Beijing 100049, China |
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Abstract A large amount of marine sedimentary phosphorite is not only the main source of phosphorus, but also a considered potential REEs resource due to the enriched REEs in its majority. In order to better understand the metallogenic regularity, occurrence state and availability of REEs in the REEs-rich phosphorites, in this paper, the Zhijin phosphorites have been studied by using means of XRD, SEM, LA-ICP-MS and TEM. The results show that REEs were mainly enriched in nano-scale apatite particles by diffusion from paleo-seawater and pore water. Low deposition rate and large specific surface area of nano-scale apatite particles are favorable to the enrichment of REEs; The late stage low-temperature, reduced, F-rich hydrothermal fluid had reworked the phosphorite and changed its REEs distribution characteristics, but this was not the main cause of REEs enrichment; TEM data revealed that REEs mainly occurred in the apatite lattice in the form of isomorphism; The characteristics of occurrence state of REEs hosted in apatite at lattice scale had constrained the REEs extraction method of decomposition and destruction of apatite is only the one can be adapted. The REEs can be extracted as associated resources using the acid leaching method, which is an effective way for economic extraction of the REEs.
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Received: 25 February 2022
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