Tessier, Loren, Andersen, Morten B.  ORCID: https://orcid.org/0000-0002-3130-9794, Poitrasson, Franck, Descamps-Mandine, Armel, Duquenoy, Camille, Menjot, Ludovic, Méjean, Pauline, Chmeleff, Jérôme, Causserand, Carole, Leisen, Mathieu and Guilbaud, Romain
2026.
Experimental determination of uranium isotope fractionations during early diagenesis of green rust.
Geochimica et Cosmochimica Acta
424
, pp. 271-287.
10.1016/j.gca.2026.04.013
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Abstract
Uranium (U) isotope compositions of ancient carbonates and shales are increasingly used as a redox proxy to reconstruct the extent of past ocean oxygenation. In euxinic (anoxic and sulphide-rich) settings, it is well known that the reduction of labile U(VI) into solid U(IV) as reduced U oxides (e.g., uraninite (UO2)) is accompanied by a significant U isotope fractionation, with the heavy isotopes being preferentially incorporated into the reduced sediment. However, large uncertainty exists on the behaviour of U and its isotopes in ferruginous (anoxic and iron-rich) environments, which were prevalent for most of the Earth’s history, thus limiting our ability to interpret U isotope signatures in ancient sediments that deposited under those conditions. Here, we explore experimentally the fate of uranium during the diagenetic transformations of green rust, a predominant mineral in ferruginous environments.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Earth and Environmental Sciences |
| Publisher: | Elsevier BV |
| ISSN: | 0016-7037 |
| Date of First Compliant Deposit: | 20 April 2026 |
| Date of Acceptance: | 9 April 2026 |
| Last Modified: | 01 Jul 2026 12:04 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/186492 |
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