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dc.rights.licenseopenen_US
hal.structure.identifierUniversity of Tromsø [UiT]
hal.structure.identifierInstitut d'écologie et des sciences de l'environnement de Paris [iEES]
hal.structure.identifierGeological Survey of Norway [NGU]
dc.contributor.authorCRÉMIÈRE, Antoine
hal.structure.identifierInstitut für Geologie und Paläontologie
dc.contributor.authorSTRAUSS, Harald
hal.structure.identifierInstitut d'écologie et des sciences de l'environnement de Paris [iEES]
dc.contributor.authorSEBILO, Mathieu
hal.structure.identifierUniversity of Tromsø [UiT]
dc.contributor.authorHONG, Wei-Li
hal.structure.identifierBiologie de la Mangrove [BM]
dc.contributor.authorGROS, Olivier
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSCHMIDT, Sabine
IDREF: 131836129
hal.structure.identifierBiologie de la Mangrove [BM]
dc.contributor.authorTOCNY, Jennifer
hal.structure.identifierLaboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
dc.contributor.authorHENRY, Françoise
hal.structure.identifierLaboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
dc.contributor.authorGONTHARET, Swanne
hal.structure.identifierEcosystèmes, biodiversité, évolution [Rennes] [ECOBIO]
dc.contributor.authorLAVERMAN, Anniet M.
dc.date.accessioned2024-05-10T16:30:18Z
dc.date.available2024-05-10T16:30:18Z
dc.date.issued2017-04
dc.identifier.issn0009-2541en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/199752
dc.description.abstractEnThe biogeochemistry of sulfur and carbon during early-diagenetic processes within organic-rich marine mangrove sediments was studied in the “Manche à Eau” lagoon, Guadeloupe, West Indies. These sediments are characterized by a total organic carbon content (TOC) mostly above 11 wt%, δ13CTOC below − 25‰ VPDB and C/Nmolar ratios exceeding 15. Rates of mangrove-derived organic carbon accumulation vary between ~ 200 and 400 gOC·m− 2·yr− 1, with highest rates at the shore of the lagoon. On the lagoon border, where colorless filamentous sulfur-oxidizing bacteria colonize the sediments, active sulfate reduction within the upper 20 cm, with a net removal rate of ~ 0.5 μmol·cm− 3·d− 1, is assumed to be essentially driven by organic carbon oxidation. This is expressed by relatively low apparent sulfur isotope fractionation (34εnet = − 33‰) and a gentle δ18O/δ34Ssulfate apparent slope of 0.36 ± 0.03 (2s). Further inside the lagoon, in the absence of sulfur-oxidizing bacteria, higher apparent sulfur isotope fractionation and a steeper δ18O/δ34Ssulfate slope (0.67 ± 0.20) suggest an overall lower sulfate removal rate that may be coupled to minor sulfur disproportionation. Spatial and vertical variation in sulfur cycling, reflected by oxygen and sulfur isotopic characteristics, seem to be mainly controlled by unsteady to relatively steady organic matter deposition and its reactivity. In all sediments, δ34S values of pyrite are positively correlated with the TOC/TS ratio and negatively correlated with δ13CTOC; suggesting a primary control of the quantity and quality of organic matter on the pyrite isotope records, despite potential iron-limiting conditions for the most active sites. Our results provide insights into the role of organic carbon input on sulfur cycling; stimulating sulfate reduction and in turn the presence of sulfur-oxidizing microbial mats, resulting in an intense cycling of both carbon and sulfur in these marine mangrove sediments.
dc.language.isoENen_US
dc.subject.enMicrobial sulfate reduction
dc.subject.enEarly diagenesis
dc.subject.enSulfur and oxygen isotopes
dc.subject.enMarine mangrove
dc.subject.enSulfur oxidizing microbial mats
dc.subject.enOrganic carbon-rich sediments
dc.title.enSulfur diagenesis under rapid accumulation of organic-rich sediments in a marine mangrove from Guadeloupe (French West Indies)
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.chemgeo.2017.02.017en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géochimieen_US
dc.subject.halSciences du Vivant [q-bio]/Ecologie, Environnement/Ecosystèmesen_US
bordeaux.journalChemical Geologyen_US
bordeaux.page67-79en_US
bordeaux.volume454en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamSEDIMen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-01507696
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Chemical%20Geology&rft.date=2017-04&rft.volume=454&rft.spage=67-79&rft.epage=67-79&rft.eissn=0009-2541&rft.issn=0009-2541&rft.au=CR%C3%89MI%C3%88RE,%20Antoine&STRAUSS,%20Harald&SEBILO,%20Mathieu&HONG,%20Wei-Li&GROS,%20Olivier&rft.genre=article


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