Geochemistry of sediment cores GeoB13820-1 and GeoB13863-1 from the western South Atlantic
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2014
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| _version_ | 1867171362149236736 |
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| author | Riedinger, Natascha Formolo, Michael J Lyons, Timothy W Henkel, Susann Beck, Antje Kasten, Sabine |
| author_facet | Riedinger, Natascha Formolo, Michael J Lyons, Timothy W Henkel, Susann Beck, Antje Kasten, Sabine |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_773188 |
| institution | PANGAEA |
| language | en |
| publishDate | 2014 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry of sediment cores GeoB13820-1 and GeoB13863-1 from the western South Atlantic Riedinger, Natascha Formolo, Michael J Lyons, Timothy W Henkel, Susann Beck, Antje Kasten, Sabine 397; 498; Center for Marine Environmental Sciences; GC; GeoB13820-1; GeoB13863-1; Gravity corer; M78/3A; M78/3B; MARUM; Meteor (1986) 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. |
| title | Geochemistry of sediment cores GeoB13820-1 and GeoB13863-1 from the western South Atlantic |
| topic | 397; 498; Center for Marine Environmental Sciences; GC; GeoB13820-1; GeoB13863-1; Gravity corer; M78/3A; M78/3B; MARUM; Meteor (1986) |
| url | https://doi.org/10.1594/PANGAEA.773188 |