Sulphur and carbon isotopes as tracers of past sub-seafloor microbial activity
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| Názov: | Sulphur and carbon isotopes as tracers of past sub-seafloor microbial activity |
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| Autori: | Meister, Patrick, Brunner, Benjamin, Picard, Aude, Böttcher, Michael E, Jørgensen, Bo Barker |
| Zdroj: | Meister, P, Brunner, B, Picard, A, Böttcher, M E & Jørgensen, B B 2019, 'Sulphur and carbon isotopes as tracers of past sub-seafloor microbial activity', Scientific Reports, vol. 9, no. 1, 604, pp. 604. https://doi.org/10.1038/s41598-018-36943-7, https://doi.org/10.1038/s41598-018-36943-7 |
| Rok vydania: | 2019 |
| Zbierka: | Aarhus University: Research |
| Predmety: | Bacteria/chemistry, Calcium Carbonate/chemistry, Carbon Isotopes/analysis, Geologic Sediments/microbiology, Iron/chemistry, Magnesium/chemistry, Methane/metabolism, Oceans and Seas, Spectrophotometry, Atomic, Sulfates/chemistry, Sulfides/chemistry, Sulfur Isotopes/analysis |
| Popis: | Microbial life below the seafloor has changed over geological time, but these changes are often not obvious, as they are not recorded in the sediment. Sulphur (S) isotope values in pyrite extracted from a Plio- to Holocene sequence of the Peru Margin (Ocean Drilling Program, ODP, Site 1229) show a down-core pattern that correlates with the pattern of carbon (C) isotopes in diagenetic dolomite. Early formation of the pyrite is indicated by the mineralogical composition of iron, showing a high degree of pyritization throughout the sedimentary sequence. Hence, the S-record could not have been substantially overprinted by later pyrite formation. The S- and C-isotope profiles show, thus, evidence for two episodes of enhanced microbial methane production with a very shallow sulphate-methane transition zone. The events of high activity are correlated with zones of elevated organic C content in the stratigraphic sequence. Our results demonstrate how isotopic signatures preserved in diagenetic mineral phases provide information on changes of past biogeochemical activity in a dynamic sub-seafloor biosphere. |
| Druh dokumentu: | article in journal/newspaper |
| Jazyk: | English |
| DOI: | 10.1038/s41598-018-36943-7 |
| Dostupnosť: | https://pure.au.dk/portal/en/publications/2aa6b696-daff-4472-9c14-f44f6c98a71b https://doi.org/10.1038/s41598-018-36943-7 http://www.scopus.com/inward/record.url?scp=85060524683&partnerID=8YFLogxK https://www.nature.com/articles/s41598-018-36943-7.pdf |
| Rights: | info:eu-repo/semantics/openAccess |
| Prístupové číslo: | edsbas.E5CADA6B |
| Databáza: | BASE |
Nájsť tento článok vo Web of Science | Abstrakt: | Microbial life below the seafloor has changed over geological time, but these changes are often not obvious, as they are not recorded in the sediment. Sulphur (S) isotope values in pyrite extracted from a Plio- to Holocene sequence of the Peru Margin (Ocean Drilling Program, ODP, Site 1229) show a down-core pattern that correlates with the pattern of carbon (C) isotopes in diagenetic dolomite. Early formation of the pyrite is indicated by the mineralogical composition of iron, showing a high degree of pyritization throughout the sedimentary sequence. Hence, the S-record could not have been substantially overprinted by later pyrite formation. The S- and C-isotope profiles show, thus, evidence for two episodes of enhanced microbial methane production with a very shallow sulphate-methane transition zone. The events of high activity are correlated with zones of elevated organic C content in the stratigraphic sequence. Our results demonstrate how isotopic signatures preserved in diagenetic mineral phases provide information on changes of past biogeochemical activity in a dynamic sub-seafloor biosphere. |
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| DOI: | 10.1038/s41598-018-36943-7 |