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Contourite drift construction influenced by capture of Mediterranean Outflow Water deep-sea current by the Portimão submarine canyon (Gulf of Cadiz, South Portugal)

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMARCHES, Elodie
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMULDER, Thierry
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCREMER, Michel
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorBONNEL, Cedric
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorHANQUIEZ, Vincent
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorGONTHIER, Eliane
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorLECROART, Pascal
dc.date.accessioned2024-11-14T12:32:53Z
dc.date.available2024-11-14T12:32:53Z
dc.date.issued2007-08-17
dc.identifier.issn0025-3227en_US
dc.identifier.urihttps://www.researchgate.net/publication/240420212_Contourite_drift_construction_influenced_by_capture_of_Mediterranean_Outflow_Water_deep-sea_current_by_the_Portimao_submarine_canyon_Gulf_of_Cadiz_South_Portugal
dc.identifier.urioai:crossref.org:10.1016/j.margeo.2007.03.013
dc.identifier.urioai:researchgate.net:240420212
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/203266
dc.description.abstractEnThe margin of the Gulf of Cadiz is swept by the deep current formed by the Mediterranean Outflow Water (MOW) flowing from the Mediterranean to the Atlantic. On the northern margin of the Gulf (Algarve Margin, South Portugal), the MOW intensity is low and fine-grained contourite drifts are built up with an alongslope development. From new sedimentological data, this study emphasizes the presence of two types of contourite drifts separated only by a deep submarine canyon incising the slope with a north-south orientation (Portimão Canyon). High-resolution seismic and bathymetry interpretation shows that on the eastern side of the canyon, the MOW forms a thick and large detached drift (Albufeira Drift) prograding toward both north and west, as shown in seismic profiles, with a high sedimentation rate. On this side of the canyon, the MOW intensity is high enough to erode the slope forming a moat channel (Alvarez Cabral). On the western side of Portimão Canyon, the MOW energy is lower, preventing moat channel erosion. Only flat and thin drift develops (Portimão and Lagos Drifts) with slow aggradation and a low sedimentation rate. This difference in drift development is due to the presence of the canyon which generates an important change in hydrodynamic of the MOW, confirmed by temperature-density measurements showing that MOW flows down Portimão Canyon. The canyon is responsible for the deviation of the direction of the MOW as it partly catches the deep-sea current flowing westward (i.e. capture phenomenon). It creates, thus, a decrease of the flow energy, competency and capacity between the east and west sides of the canyon. Through this phenomenon of MOW deep-sea current capture, the canyon constitutes a morphologic feature generating an important change in the contourite deposition pattern.
dc.language.isoENen_US
dc.sourcecrossref
dc.sourceresearchgate
dc.subject.encontourite drift
dc.subject.enMediterranean Outflow Water
dc.subject.encontour current capture
dc.subject.ensubmarine canyon
dc.subject.enGulf of Cadiz
dc.title.enContourite drift construction influenced by capture of Mediterranean Outflow Water deep-sea current by the Portimão submarine canyon (Gulf of Cadiz, South Portugal)
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.margeo.2007.03.013en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalMarine Geologyen_US
bordeaux.page247-260en_US
bordeaux.volume242en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue4en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.identifierhal-04782880
hal.version1
hal.date.transferred2024-11-14T12:32:55Z
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=2007-08-17&rft.volume=242&rft.issue=4&rft.spage=247-260&rft.epage=247-260&rft.eissn=0025-3227&rft.issn=0025-3227&rft.au=MARCHES,%20Elodie&MULDER,%20Thierry&CREMER,%20Michel&BONNEL,%20Cedric&HANQUIEZ,%20Vincent&rft.genre=article


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