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Contourites in the Gulf of Cadiz: A cautionary note on potentially ambiguous indicators of bottom current velocity

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMULDER, Thierry
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorHASSAN, Rim
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDUCASSOU, Emmanuelle
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorZARAGOSI, Sebastien
IDREF: 189039159
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorGONTHIER, Eliane
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorHANQUIEZ, Vincent
dc.contributor.authorMARCHÈS, Elodie
dc.contributor.authorTOUCANNE, Samuel
dc.date.accessioned2024-10-24T12:30:35Z
dc.date.available2024-10-24T12:30:35Z
dc.date.issued2013-06-16
dc.identifier.issn0276-0460en_US
dc.identifier.urihttps://www.researchgate.net/publication/250306359_Contourites_in_the_Gulf_of_Cadiz_A_cautionary_note_on_potentially_ambiguous_indicators_of_bottom_current_velocity
dc.identifier.urioai:researchgate.net:250306359
dc.identifier.urioai:crossref.org:10.1007/s00367-013-0332-4
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/202711
dc.description.abstractEnFacies associations in cores collected in the deep part of the Gulf of Cadiz, which is under the influence of the lower branch of the Mediterranean Outflow Water, are investigated in terms of the classical contourite model using grain-size analyses and thin sections of indurated sediment. Cores include both low-energy (contourite drift) and high-energy (channel) environments. The thin sections and grain-size distributions show that clayey fine silts and sandy coarse silts are the most common facies associations in the studied contourite sequences, while coarse-grained, gravelly contourites are less common. Grain-size distributions are unimodal in the fine-grained and bi- or trimodal in the coarser-grained contourites. This change in grain-size composition is related both to the partial removal of the fine-grained fraction and to the replenishment of the coarser-grained one. In addition, most of the contacts between individual facies are sharp rather than transitional. This suggests that the contourite sequence is only in part related to changes in bottom current velocity and flow competency, but may also be related to the supply of a coarser terrigeneous particle stock, provided by either increased erosion of indurated mud along the flanks of confined contourite channels (mud clasts), or by increased sediment supply by rivers (quartz grains) and downslope mass transport on the continental shelf and upper slope. The classical contourite facies association may therefore not be solely controlled by current velocity, but may be the product of a variety of depositional histories. The classical contourite depositional sequence should therefore be interpreted with greater care and in the light of the regional sedimentological background. In addition, the wisdom of exclusively using mean or modal particle size for the interpretation of depositional contourite processes is questioned. Instead, it is proposed that the vertical evolution of grain-size populations in the facies successions forming contourite sequences be assessed.
dc.language.isoENen_US
dc.sourceresearchgate
dc.sourcecrossref
dc.title.enContourites in the Gulf of Cadiz: A cautionary note on potentially ambiguous indicators of bottom current velocity
dc.typeArticle de revueen_US
dc.identifier.doi10.1007/s00367-013-0332-4en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalGeo-Marine Lettersen_US
bordeaux.page357-367en_US
bordeaux.volume33en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue5en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamGEOLSEDen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
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=Geo-Marine%20Letters&rft.date=2013-06-16&rft.volume=33&rft.issue=5&rft.spage=357-367&rft.epage=357-367&rft.eissn=0276-0460&rft.issn=0276-0460&rft.au=MULDER,%20Thierry&HASSAN,%20Rim&DUCASSOU,%20Emmanuelle&ZARAGOSI,%20Sebastien&GONTHIER,%20Eliane&rft.genre=article


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