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dc.contributor.authorCremiere, Antoine
dc.contributor.authorPellerin, André
dc.contributor.authorWing, Boswell A.
dc.contributor.authorLepland, Aivo
dc.date.accessioned2020-03-10T07:17:16Z
dc.date.available2020-03-10T07:17:16Z
dc.date.issued2019-12-19
dc.description.abstractThe anaerobic oxidation of methane coupled with sulfate reduction (AOM-SR) is a major microbially-mediated methane consuming process in marine sediments including methane seeps. The AOM-SR can lead to the formation of methane-derived authigenic carbonates which entrap sulfide minerals (pyrite) and carbonate-associated sulfate (CAS). We studied the sulfur isotope compositions of the pyrite and CAS in seafloor methane-derived authigenic carbonate crust samples from the North Sea and Barents Sea which reflect the time-integrated metabolic activity of the AOM-SR community as well as the physical conditions under which those carbonates are formed. In these samples, pyrite exhibits δ<sup>34</sup>S values ranging from −23.4‰ to 14.8‰ and Δ<sup>33</sup>S values between −0.06‰ and 0.16‰, whereas CAS is characterized by δ<sup>34</sup>S values ranging from 26.2‰ to 61.6‰ and Δ<sup>33</sup>S mostly between −0.05‰ and 0.07‰. Such CAS sulfur isotope compositions are distinctly lower in δ<sup>34</sup>S-Δ<sup>33</sup>S space from published porewater sulfate values from environments where the reduction of sulfate is mostly coupled to sedimentary organic matter oxidation. Mass-balance modelling suggests that (1) AOM-SR appears to cause rapid carbonate precipitation under high methane flux near or at the sediment-water interface and (2) that the precipitation of pyrite and carbonates are not necessarily synchronous. The sulfur isotopic composition of pyrite is interpreted to reflect more variable precipitating conditions of evolving sulfide with porewater connectivity, fluctuating methane fluxes and oxidative sulfur cycle. Taken together, the multiple isotopic compositions of pyrite and sulfate in methane-derived authigenic carbonates indicate protracted precipitation under conditions of non-steady state methane seepage activity.en_US
dc.descriptionAccepted manuscript version, licensed <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/> CC BY-NC-ND 4.0. </a>en_US
dc.identifier.citationCremiere A, Pellerin, Wing BA, Lepland A. Multiple sulfur isotopes in methane seep carbonates track unsteady sulfur cycling during anaerobic methane oxidation. Earth and Planetary Science Letters. 2019;532(115994)en_US
dc.identifier.cristinIDFRIDAID 1766753
dc.identifier.doi10.1016/j.epsl.2019.115994
dc.identifier.issn0012-821X
dc.identifier.issn1385-013X
dc.identifier.urihttps://hdl.handle.net/10037/17687
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalEarth and Planetary Science Letters
dc.relation.projectIDNorges forskningsråd: 223259en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holder© 2019 Elsevier B.V. All rights reserved.en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleMultiple sulfur isotopes in methane seep carbonates track unsteady sulfur cycling during anaerobic methane oxidationen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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