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When deep diagenesis in Arctic Ocean sediments compromises manganese-based geochronology

dc.rights.licenseopenen_US
dc.contributor.authorSUNDBY, Bjorn
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorLECROART, Pascal
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorANSCHUTZ, Pierre
ORCID: 0000-0001-5331-7974
IDREF: 076300331
dc.contributor.authorKATSEV, Sergei
dc.contributor.authorMUCCI, Alfonso
dc.date.accessioned2024-06-17T12:12:45Z
dc.date.available2024-06-17T12:12:45Z
dc.date.issued2015-04-27
dc.identifier.issn0025-3227en_US
dc.identifier.urihttps://www.researchgate.net/publication/275589280_When_deep_diagenesis_in_Arctic_Ocean_sediments_compromises_manganese-based_geochronology
dc.identifier.urioai:crossref.org:10.1016/j.margeo.2015.04.005
dc.identifier.urioai:researchgate.net:275589280
dc.identifier.urioadoi:http://digitool.Library.McGill.CA:80/webclient/DeliveryManager?pid=143055&custom_att_2=direct
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/200500
dc.description.abstractEnWe used a diagenetic model to test the hypothesis that manganese-rich layers in gas hydrate-bearing Arctic Ocean sediments are reliable time markers for interglacial periods. In the model, diagenesis is fuelled by two sources of reactive carbon: particulate organic carbon settling to the sediment surface, and methane diffusing up from deep gas hydrate deposits. The model includes oxidation of organic carbon and soluble reduced manganese by oxygen supplied continuously from an invariant bottom-water oxygen reservoir; reduction of particulate manganese by hydrogen sulfide generated through anaerobic methane oxidation; transport of dissolved oxygen and manganese by diffusion; and advective transport of particulate components by burial. Particulate organic matter and particulate manganese are only supplied to the sediment during interglacials. Sulfate reduction is not modeled explicitly; instead, the effect of anaerobic methane oxidation on Mn reduction is simulated at the lower boundary of the model by prescribing that particulate manganese is reduced there to soluble Mn(II). The soluble reduced Mn then diffuses upward and is oxidatively precipitated to Mn(IV) by downward diffusing oxygen. The upward flux of soluble Mn(II) is thus a function of the rate at which particulate manganese is advected into the Mn-reduction layer at the bottom of the model; it is not synchronous with events at the sediment–water interface. Model runs reveal that, under idealized but realistic conditions for the Arctic Ocean, oxidation of upward-diffusing Mn(II) generates post-depositional manganese enrichments that cannot readily be distinguished from the manganese-rich sediment layers that accumulate during interglacials. This compromises the use of manganese-rich layers as proxies for interglacial periods. In contrast, manganese-rich layers may be used as first-order markers of interglacial periods in sediments where gas hydrates or other forms of reactive carbon are absent.
dc.language.isoENen_US
dc.sourcecrossref
dc.sourceresearchgate
dc.sourceoadoi_repo
dc.title.enWhen deep diagenesis in Arctic Ocean sediments compromises manganese-based geochronology
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.margeo.2015.04.005en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalMarine Geologyen_US
bordeaux.page62-68en_US
bordeaux.volume366en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamECOBIOCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.identifierhal-04614324
hal.version1
hal.date.transferred2024-06-17T12:12:47Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
workflow.import.sourcedissemin
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Marine%20Geology&rft.date=2015-04-27&rft.volume=366&rft.spage=62-68&rft.epage=62-68&rft.eissn=0025-3227&rft.issn=0025-3227&rft.au=SUNDBY,%20Bjorn&LECROART,%20Pascal&ANSCHUTZ,%20Pierre&KATSEV,%20Sergei&MUCCI,%20Alfonso&rft.genre=article


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