{
  "abstract": "The oxidative enrichment and isotopic fractionation of cerium (Ce) in contact with vernadite (δ-MnO2) serve as paleoredox indicators in both terrestrial and marine environments. However, the molecular processes that govern the scavenging of Ce from the dissolved 3+ to the insoluble 4+ states remain obscure. Adsorption experiments on synthetic δ-MnO2 suggest that aqueous Ce(III) precipitates as ceric hydroxide (Ce(OH)4), an unidentified mineral. Here, the atomic-scale structure of Ce in natural vernadite from ferromanganese crusts collected across the Pacific, Atlantic, and Indian Oceans was examined using advanced high-energy-resolution extended X-ray absorption fine structure spectroscopy. The findings provide the first direct evidence for the uptake of Ce as mononuclear Ce(IV) complexes on the layer edges (DES complex) and on Mn(IV) vacancy sites (Half-INC complex) of vernadite. Density functional theory-based Gibbs free-energy calculations show that hydrolysis of the surface complexes promotes the oxidation of Ce(III) to Ce(IV). Quantum mechanical calculations predict that the equilibrium ¹³⁶Ce/¹⁴⁰Ce isotope fractionation factor between Ce(III) dissolved in seawater and the Ce(IV) complexes can reach 10³lnα = 1.4-1.5 at 25 °C, indicating that the ¹³⁶Ce/¹⁴⁰Ce ratio has high potential as a new paleoredox proxy",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 8,
  "authors": [
    {
      "name": "Alain Manceau"
    },
    {
      "name": "Jianlin Liao"
    },
    {
      "name": "Yan Li"
    },
    {
      "name": "Andrea Giacomelli"
    },
    {
      "name": "Marius Retegan"
    },
    {
      "name": "Andrea Koschinsky"
    },
    {
      "name": "Stephan N. Steinmann"
    },
    {
      "name": "Olivier Mathon"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2jg0qapepzphz.bib",
  "cited_by": 7,
  "doi": "10.1038/s43247-026-03196-6",
  "fulltext_url": null,
  "id": "2jg0qapepzphz",
  "issns": [
    "2662-4435"
  ],
  "landing_url": "https://hal.science/hal-05762853v1",
  "language": "en",
  "licence": "CC-BY-NC-4.0",
  "licence_label": "CC BY-NC 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.sdu"
    ],
    [
      "hal",
      "1.sdu.stu"
    ],
    [
      "hal",
      "2.sdu.stu.gc"
    ],
    [
      "openalex",
      "1906|Geochemistry and Elemental Analysis"
    ]
  ],
  "openalex": "W7124930589",
  "pdf_url": "https://hal.science/hal-05762853/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-24",
  "publisher": "Springer Nature",
  "ris": "https://research.draconitic.com/paper/2jg0qapepzphz.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:40Z",
      "native_id": "hal-05762853",
      "source": "hal",
      "url": "https://hal.science/hal-05762853v1"
    }
  ],
  "subjects": [
    {
      "field": "earth",
      "origin": "hal:2.sdu.stu.gc",
      "subfield": "geology-geochemistry"
    }
  ],
  "title": "Chemical forms of cerium in ferromanganese crusts from the Global Ocean: Implications for the fractionation of cerium isotopes",
  "title_text": "Chemical forms of cerium in ferromanganese crusts from the Global Ocean: Implications for the fractionation of cerium isotopes",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:40Z",
  "url": "https://research.draconitic.com/paper/2jg0qapepzphz",
  "venue": "Communications Earth & Environment",
  "versions": []
}