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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2021

Diagenetic formation of uranium-silica polymers in lake sediments over 3,300 years

Pierre Lefebvre
Pascale Louvat
Pauline Merrot
  • Fonction : Auteur
Camille Baya
  • Fonction : Auteur
Emmanuel Malet
  • Fonction : Auteur
Didier Jézéquel
Jérôme Gaillardet
  • Fonction : Auteur
Guillaume Morin
Jean-Louis Reyss
  • Fonction : Auteur
John Bargar

Résumé

Significance Understanding the long-term fate of widespread noncrystalline uranium (U) species is critical to improving our knowledge of U biogeochemistry and U-contaminated environments. We use naturally U-enriched lake sediments that have been deposited for thousands of years as an analogue for the progressive evolution of contaminated environments, in order to uncover if noncrystalline species may evolve into more resistant crystalline phases. We combine multidisciplinary tools including U isotope ratio and speciation techniques to describe a mineralogical transformation where organic-bound U evolves into polymeric and nanocrystalline uranium-silica phases that are still easily remobilized even 3,300 y after their deposition. These findings bring an interpretation that illuminates an active debate on uranium mobility in the environment.
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Origine : Publication financée par une institution

Dates et versions

hal-03963873 , version 1 (24-02-2021)
hal-03963873 , version 2 (15-03-2023)

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Pierre Lefebvre, Alkiviadis Gourgiotis, Arnaud Mangeret, Pierre Sabatier, Pierre Le Pape, et al.. Diagenetic formation of uranium-silica polymers in lake sediments over 3,300 years. Proceedings of the National Academy of Sciences of the United States of America, 2021, 118 (4), ⟨10.1073/pnas.2021844118⟩. ⟨hal-03963873v2⟩
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