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Fluocerite as a precursor to rare earth element fractionation in ore-forming systems

Nature Geoscience volume 15, pages 327–333 (2022)Cite this article

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Abstract

Emerging renewable energy technologies and low-carbon transportation rely heavily on the unique optical and magnetic properties of the rare earth elements. The medium to heavy rare earth elements, neodymium to lutetium, are most sought by industry but are the least abundant in nature. Only a small proportion of known rare earth element deposits are enriched in these elements. Identifying additional sources of medium to heavy rare earth elements for resource exploration requires improved understanding of the mechanisms responsible for the formation of such highly fractionated deposits. Here we report the results of experiments demonstrating a mechanism that could lead to enrichment of medium to heavy rare earth elements in ore-forming hydrothermal systems. In our experiments, we simulated natural hydrothermal systems by heating a column containing apatite and fluorite through which we pumped a chloride-rich solution bearing rare earth elements. Analysis of our experiments shows that the fluoride mineral fluocerite can serve as a precursor phase that fractionates rare earth elements before it is subsequently converted to a thermodynamically more stable mineral. Our findings identify geological settings in which fluocerite is observed or predicted to occur as potential exploration targets for deposits enriched in medium to heavy rare earth elements.

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Fig. 1: Solution chemistry of the hydrothermal fluid after reacting with apatite at 250 °C.
Fig. 2: Scanning electron microscopy images demonstrating the difference in the apatite- and fluorite-mediated mechanisms of REE mineral deposition.
Fig. 3: Concentration of the REEs in the solids as a function of distance along a column after an experiment.
Fig. 4: Micro-beam X-ray fluorescence maps of the apatite/fluorite mixed column for La, Nd and Er.

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All the data on which this manuscript is based are available to readers from the Supplementary Information. Source data are provided with this paper.

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Acknowledgements

Research presented in this article was supported both by the National Energy Technology Laboratory under project number FE-810-17-FY17 and by the Laboratory Directed Research and Development programme of Los Alamos National Laboratory under project number 20190057DR. A.C.S. and X.G. acknowledge the support by the US Department of Energy Office of Nuclear Energy grants DE-NE0008582 and DE-NE0008689.

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Authors and Affiliations

  1. Los Alamos National Laboratory, Earth and Environmental Sciences Division, Los Alamos, NM, USA

    Andrew C. Strzelecki, Artas Migdisov, Hakim Boukhalfa & Kirsten Sauer

  2. Department of Chemistry, Washington State University, Pullman, WA, USA

    Andrew C. Strzelecki & Xiaofeng Guo

  3. Alexandra Navrotsky Institute for Experimental Thermodynamics, Washington State University, Pullman, WA, USA

    Andrew C. Strzelecki & Xiaofeng Guo

  4. Materials Science and Engineering, Washington State University, Pullman, WA, USA

    Andrew C. Strzelecki & Xiaofeng Guo

  5. Los Alamos National Laboratory, Chemistry Division, Los Alamos, NM, USA

    Kathryn G. McIntosh & Robert P. Currier

  6. Department of Earth and Planetary Sciences, McGill University, Montreal, Quebec, Canada

    Anthony E. Williams-Jones

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Contributions

A.M. and H.B. conceived the research. A.C.S. developed the experimental method and conducted experiments. K.S. and K.G.M. performed scanning electron microscopy and μXRF studies, respectively. All co-authors participated in discussions, interpretation of the data and writing of the manuscript.

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Correspondence to Andrew C. Strzelecki.

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Nature Geoscience thanks John Mavrogenes, Kathryn Goodenough and Kenzo Sanematsu for their contribution to the peer review of this work. Primary Handling Editors: Tamara Goldin and Simon Harold, in collaboration with the Nature Geoscience team.

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Supplementary Information

Supplementary Methods and thermodynamic calculation descriptions, Results, Discussion, Figs. 1–9 and Table 1.

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The source data that were used to produce the various figures in the main text and supplementary text.

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Source Data Fig. 1

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Data used to generate Fig. 3a,b in the main text and data used to generate Fig. 3c,d in the main text.

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Strzelecki, A.C., Migdisov, A., Boukhalfa, H. et al. Fluocerite as a precursor to rare earth element fractionation in ore-forming systems. Nat. Geosci. 15, 327–333 (2022). https://doi.org/10.1038/s41561-022-00921-6

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