An inorganic geochemical argument for coupled anaerobic oxidation of methane and iron reduction in marine sediments
Abstract
Here, we present results from sediments collected in the Argentine Basin, a non-steady state depositional marine system characterized by abundant oxidized iron within methane-rich layers due to sediment reworking followed by rapid deposition. Our comprehensive inorganic data set shows that iron reduction in these sulfate and sulfide-depleted sediments is best explained by a microbially mediated process-implicating anaerobic oxidation of methane coupled to iron reduction (Fe-AOM) as the most likely major mechanism. Although important in many modern marine environments, iron-driven AOM may not consume similar amounts of methane compared with sulfate-dependent AOM. Nevertheless, it may have broad impact on the deep biosphere and dominate both iron and methane cycling in sulfate-lean marine settings. Fe-AOM might have been particularly relevant in the Archean ocean, >2.5 billion years ago, known for its production and accumulation of iron oxides (in iron formations) in a biosphere likely replete with methane but low in sulfate. Methane at that time was a critical greenhouse gas capable of sustaining a habitable climate under relatively low solar luminosity, and relationships to iron cycling may have impacted if not dominated methane loss from the biosphere.
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The reduction of ferric iron may also have been coupled to the anaerobic oxidation of methane.
“Moreover, the reduction of ferric iron may also have been coupled to the anaerobic oxidation of methane (Konhauser et al., 2005), an observation supported by the reaction's likely occurrence in modern marine sediments (Riedinger et al., 2014) and lakes (Crowe et al., 2011), as well as in culture experiments (Ettwig et al., 2016; Bray et al., 2017).”
From Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history (2017) · cites this paper as Riedinger et al., 2014
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Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history
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- Authors
- Riedinger, N., Formolo, M. J., Lyons, T. W., Henkel, S., Beck, A., & Kasten, S.
- Affiliations
- University of California, Riverside (US)
- University of Tulsa (US)
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung (DE)
- Aarhus University (DK)
- Corresponding author
- Riedinger, N.
- Venue
- Geobiology
- Publisher
- Wiley
- Published
- 2014-01-27
- Volume
- 12
- Issue
- 2
- Pages
- 172-181
- ISSN
- 1472-4669 (ISSN-L)
- 1472-4677
- OpenAlex
- W2166618114
- Cited by
- 231
- References
- 84
- Citations by year
- 2026: 12 · 2025: 22 · 2024: 15 · 2023: 15 · 2022: 19 · 2021: 29 · 2020: 29 · 2019: 14 · 2018: 21 · 2017: 25 · 2016: 13 · 2015: 11 · 2014: 6
- FWCI
- 13.93
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Geobiology (publishedVersion)
- PubMed (publishedVersion)
- Helmholtz-Zentrum für Polar-und Meeresforschung (Alfred-Wegener-Institut) (submittedVersion)
- Funders
- National Science Foundation
- University of California, Riverside
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Methane Hydrates and Related Phenomena
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Keywords
- anaerobic oxidation of methane, iron reduction, marine sediment, Argentine Basin, oxidized iron, methane cycling, iron cycling, deep biosphere, Archean ocean, iron-formation, greenhouse gases, sediment reworking
- MeSH terms
- Anaerobiosis, Atlantic Ocean, Iron, Methane, Oxidation-Reduction, Sulfates, Geologic Sediments
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