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Title: Adsorption of rare earth elements in regolith-hosted clay deposits
Author: Borst, Anouk M.
Smith, Martin P.
Finch, Adrian A.
Estrade, Guillaume
Villanova de Benavent, Cristina
Nason, Peter
Marquis, Eva
Horsburgh, Nicola J.
Goodenough, Kathryn M.
Xu, Cheng
Kynický, Jindř
Geraki, Kalotina
Keywords: Espectroscòpia de raigs X
Minerals d'argila
X-ray spectroscopy
Clay minerals
Issue Date: 1-Sep-2020
Publisher: Nature Publishing Group
Abstract: Global resources of heavy Rare Earth Elements (REE) are dominantly sourced from Chinese regolith-hosted ion-adsorption deposits in which the REE are inferred to be weakly adsorbed onto clay minerals. Similar deposits elsewhere might provide alternative supply for these high-tech metals, but the adsorption mechanisms remain unclear and the adsorbed state of REE to clays has never been demonstrated in situ. This study compares the mineralogy and speciation of REE in economic weathering profiles from China to prospective regoliths developed on peralkaline rocks from Madagascar. We use synchrotron X-ray absorption spectroscopy to study the distribution and local bonding environment of Y and Nd, as proxies for heavy and light REE, in the deposits. Our results show that REE are truly adsorbed as easily leachable 8- to 9-coordinated outer-sphere hydrated complexes, dominantly onto kaolinite. Hence, at the atomic level, the Malagasy clays are genuine mineralogical analogues to those currently exploited in China.
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It is part of: Nature Communications, 2020, vol. 11, num. 4386
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ISSN: 2041-1723
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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