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Mobilization and Fractionation of Rare Earth Elements During Experimental Bio-weathering of Granites by Yilin He; Lingya Ma; Xurui Li; Heng Wang; Xiaoliang Liang; Jianxi Zhu; Hongping He is a Earth and Planetary Sciences article available to read on EtoBox.

What is Mobilization and Fractionation of Rare Earth Elements During Experimental Bio-weathering of Granites about?

Weathering of parent granite is pivotal in the formation of regolith-hosted rare earth elements (REE) deposits, which provide over 90 % of global heavy rare earth elements (HREE) demand. Microbes have been recognized to control the fates of REE during weathering jointly with other geochemical factors, but the specific mechanisms of how microbes affect REE mobilization and fractionation remain poorly understood. In this study, bio-weathering experiments at room temperature were conducted with four native bacterial isolates from the Dabu regolith-hosted HREE deposit to investigate the microbial effects on REE mobilization from the parent granite. The presence of these isolates remarkably enhanced the liberation of REE by a factor of 4–21 at the end of the 30-day experiments. Concomitantly, microbes could immobilize REE through extracellular metabolites-induced precipitation and, to a lesser extent, by cell sorption, resulting in 25 %–82 % underestimations of the REE release efficiencies. The synergy of acidolysis and complexation was found to be a crucial bio-weathering mechanism, and complexation with organic acid ligands was more efficient in mobilizing REE at weakly acidic to near

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Author

Yilin He; Lingya Ma; Xurui Li; Heng Wang; Xiaoliang Liang; Jianxi Zhu; Hongping He

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)