{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T08:58:11Z","timestamp":1790758691457,"version":"4.1.0"},"reference-count":61,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2023,1,13]],"date-time":"2023-01-13T00:00:00Z","timestamp":1673568000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Geobiology"],"published-print":{"date-parts":[[2023,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The nitrogen isotopic composition of organic matter is controlled by metabolic activity and redox speciation and has therefore largely been used to uncover the early evolution of life and ocean oxygenation. Specifically, positive \u03b4<jats:sup>15<\/jats:sup>N values found in well\u2010preserved sedimentary rocks are often interpreted as reflecting the stability of a nitrate pool sustained by water column partial oxygenation. This study adds much\u2010needed data to the sparse Paleoarchean record, providing carbon and nitrogen concentrations and isotopic compositions for more than fifty samples from the 3.4\u2009Ga Buck Reef Chert sedimentary deposit (BRC, Barberton Greenstone Belt). In the overall anoxic and ferruginous conditions of the BRC depositional environment, these samples yield positive \u03b4<jats:sup>15<\/jats:sup>N values up to +6.1\u2030. We argue that without a stable pool of nitrates, these values are best explained by non\u2010quantitative oxidation of ammonium via the Feammox pathway, a metabolic co\u2010cycling between iron and nitrogen through the oxidation of ammonium in the presence of iron oxides. Our data contribute to the understanding of how the nitrogen cycle operated under reducing, anoxic, and ferruginous conditions, which are relevant to most of the Archean. Most importantly, they invite to carefully consider the meaning of positive \u03b4<jats:sup>15<\/jats:sup>N signatures in Archean sediments.<\/jats:p>","DOI":"10.1111\/gbi.12540","type":"journal-article","created":{"date-parts":[[2023,1,13]],"date-time":"2023-01-13T16:20:37Z","timestamp":1673626837000},"page":"277-289","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Iron\u2010mediated anaerobic ammonium oxidation recorded in the early Archean ferruginous ocean"],"prefix":"10.1111","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6828-5899","authenticated-orcid":false,"given":"Alice","family":"Pellerin","sequence":"first","affiliation":[{"name":"Laboratoire Biog\u00e9osciences, UMR CNRS 6282 Universit\u00e9 de Bourgogne Franche\u2010Comt\u00e9  Dijon France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christophe","family":"Thomazo","sequence":"additional","affiliation":[{"name":"Laboratoire Biog\u00e9osciences, UMR CNRS 6282 Universit\u00e9 de Bourgogne Franche\u2010Comt\u00e9  Dijon France"},{"name":"Institut Universitaire de France (IUF)  Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9239-1509","authenticated-orcid":false,"given":"Magali","family":"Ader","sequence":"additional","affiliation":[{"name":"Universit\u00e9 Paris Cit\u00e9, Institut de Physique du Globe de Paris, CNRS  Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4265-1595","authenticated-orcid":false,"given":"Johanna","family":"Marin\u2010Carbonne","sequence":"additional","affiliation":[{"name":"Institut des Sciences de la Terre University of Lausanne  Lausanne Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julien","family":"Alleon","sequence":"additional","affiliation":[{"name":"Institut des Sciences de la Terre University of Lausanne  Lausanne Switzerland"},{"name":"Universit\u00e9 de Lyon, ENS de Lyon, Universit\u00e9 Lyon 1, CNRS, LGL\u2010TPE  Lyon France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emmanuelle","family":"Vennin","sequence":"additional","affiliation":[{"name":"Laboratoire Biog\u00e9osciences, UMR CNRS 6282 Universit\u00e9 de Bourgogne Franche\u2010Comt\u00e9  Dijon France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Axel","family":"Hofmann","sequence":"additional","affiliation":[{"name":"Department of Geology University of Johannesburg  Johannesburg South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,1,13]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemgeo.2016.02.010"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s43247\u2010020\u201000066\u20107"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0301\u20109268(99)00005\u20104"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.precamres.2005.02.001"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/ggr.12345"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1310488110"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemgeo.2005.08.002"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.earth.33.092203.122711"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1186120"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.2113\/gselements.9.5.359"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1128\/AEM.68.8.3802\u20103808.2002"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.precamres.2006.04.005"},{"key":"e_1_2_9_14_1","unstructured":"Gali\u0107 A.(2015).Unravelling atmospheric photolysis and ocean redox chemistry from Paleoarchean pyrite: A multiple sulfur and iron stable isotope study. 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