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Formation and evolution of glauconite in the Demerara Contourite depositional system related to NADW circulation changes during late Quaternary (French Guiana)

dc.rights.licenseopenen_US
hal.structure.identifierCentre de Formation et de Recherche sur les Environnements Méditérranéens [CEFREM]
dc.contributor.authorTALLOBRE, Cédric
hal.structure.identifierCentre de Formation et de Recherche sur les Environnements Méditérranéens [CEFREM]
dc.contributor.authorGIRESSE, Pierre
hal.structure.identifierCentre de Formation et de Recherche sur les Environnements Méditérranéens [CEFREM]
dc.contributor.authorBASSETTI, Maria-Angela
hal.structure.identifierCentre de Formation et de Recherche sur les Environnements Méditérranéens [CEFREM]
dc.contributor.authorLONCKE, Lies
hal.structure.identifierUnité Géosciences Marines [GM]
dc.contributor.authorBAYON, Germain
hal.structure.identifierCentre de formation et de recherche en environnement marin [CEFREM]
dc.contributor.authorBUSCAIL, Roselyne
hal.structure.identifierGéosciences Paris Sud [GEOPS]
dc.contributor.authorTUDRYN, Alina
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorZARAGOSI, Sebastien
IDREF: 189039159
dc.date.accessioned2024-01-31T09:55:41Z
dc.date.available2024-01-31T09:55:41Z
dc.date.issued2019-06
dc.identifier.issn0895-9811en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/187680
dc.description.abstractEnThe Demerara Plateau is a marginal plateau which forms a bathymetric relief on the sea floor. Here, contourite deposits have been studied in detail, following the recent discovery of contourite sequences likely related to the bottom currents and linked both to contour current and peculiar sea-floor morphology. A chronostratigraphic framework, based on δ18O relative variations and palaeomagnetic events in sediment cores allows correlating sediment processes to current intensity changes and major climate phases (glacial or interglacial). The studied sediments are enriched in glauconitic grains. In addition, the glauconite mineralogical maturity can easily correlate to low sedimentation rate and slightly energetic bottom currents on the seafloor. Based on these data and using the glauconitic authigenic mineral as proxy for inferring the degree of winnowing at the sediment-water interface, we might put forward the hypothesis that the intensity of NADW is higher during the glacial stages and lower during interglacial periods.
dc.language.isoENen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc/
dc.title.enFormation and evolution of glauconite in the Demerara Contourite depositional system related to NADW circulation changes during late Quaternary (French Guiana)
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.jsames.2019.03.011en_US
dc.subject.halPlanète et Univers [physics]en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terreen_US
bordeaux.journalJournal of South American Earth Sciencesen_US
bordeaux.page167-183en_US
bordeaux.volume92en_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-02087669
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
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