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dc.contributor.authorPaiste, Kärt
dc.contributor.authorLepland, Aivo
dc.contributor.authorZerkle, A.L.
dc.contributor.authorKirsimäe, Kalle
dc.contributor.authorIzon, G.
dc.contributor.authorPatel, N.K.
dc.contributor.authorMcLean, F.
dc.contributor.authorKreitsmann, T.
dc.contributor.authorMänd, Kaarel
dc.contributor.authorBui, T.H.
dc.contributor.authorRomashkin, Alexander E.
dc.contributor.authorRychanchik, Dimitry V.
dc.contributor.authorPrave, Anthony R
dc.date.accessioned2019-04-01T10:39:45Z
dc.date.available2019-04-01T10:39:45Z
dc.date.issued2018-09-19
dc.description.abstractThe exceptionally organic-rich rocks of the 1.98 Ga Zaonega Formation deposited in the Onega Basin, NW Russia, have refined our understanding of Earth System evolution during the Paleoproterozoic rise in atmospheric oxygen. These rocks were formed in vent- or seep influenced settings contemporaneous with voluminous mafic volcanism and contain strongly <sup>13</sup>C-depleted organic matter. Here we report new isotopic (δ<sup>34</sup>S, Δ<sup>33</sup>S, Δ<sup>36</sup>S, δ<sup>13</sup>C<sub>org</sub>) and mineralogical, major element, total sulphur and organic carbon data for the upper part of the Zaonega Formation, which was deposited shortly after the termination of the Lomagundi-Jatuli positive carbon isotope excursion. The data were collected on a recently obtained 102 m drillcore section and show a δ<sup>13</sup>C<sub>org</sub> shift from -38‰ to -25‰. Sedimentary sulphides have δ<sup>34</sup>S values typically between +15‰ and +25‰ reflecting closed-system sulphur isotope behaviour driven by high rates of microbial sulphate reduction, high sulphate demand, hydrothermal activity and hydrocarbon seepage. Four intervals record δ<sup>34</sup>S values that exceed +30‰. We interpret these unusually <sup>34</sup>S-enriched sulphides to be a result of limited sulfate diffusion into pore waters due to changes in sedimentation and/or periods of basinal restriction. Additionally, there are four negative δ<sup>34</sup>S and positive Δ<sup>33</sup>S excursions that are interpreted to reflect changes in the open/closed-system behaviour of sulphate reduction or availability of reactive iron. Our findings highlight the influence of basinal processes in regulating sulphur isotope records and the need for care before interpreting such signals as reflecting global conditions.en_US
dc.description.sponsorshipNatural Environment Council Standard Grant NE/J023485/2. The Simons Collaboration on the Origins of Life The Estonian 749 Science Agency grant PUT696 Estonian Center of Analytical Chemistryen_US
dc.descriptionAccepted manuscript version, licensed <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/> CC BY-NC-ND 4.0. </a> Source at: <a href=http://doi.org/10.1016/j.chemgeo.2018.09.025> http://doi.org/10.1016/j.chemgeo.2018.09.025 </a>en_US
dc.identifier.citationPaiste, K., Lepland, A., Zerkle, A., Kirsimäe, K., Izon, G., Patel, N. K., ... Prave, A. R. (2018). Multiple sulphur isotope records tracking basinal and global processes in the 1.98 Ga Zaonega Formation, NW Russia. <i>Chemical Geology</i>, 499, 151-164. http://doi.org/10.1016/j.chemgeo.2018.09.025en_US
dc.identifier.cristinIDFRIDAID 1618622
dc.identifier.doi10.1016/j.chemgeo.2018.09.025
dc.identifier.issn0009-2541
dc.identifier.issn1872-6836
dc.identifier.urihttps://hdl.handle.net/10037/15115
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalChemical Geology
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norwat/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleMultiple sulphur isotope records tracking basinal and global processes in the 1.98 Ga Zaonega Formation, NW Russiaen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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