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Perched lobe formation in the Gulf of Cadiz: Interactions between gravity processes and contour currents (Algarve Margin, Southern 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.authorGONTHIER, Eliane
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCREMER, Michel
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorHANQUIEZ, Vincent
dc.contributor.authorGARLAN, T.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorLECROART, Pascal
dc.date.accessioned2024-11-13T14:57:10Z
dc.date.available2024-11-13T14:57:10Z
dc.date.issued2010-08-01
dc.identifier.issn0037-0738en_US
dc.identifier.urihttps://www.researchgate.net/publication/222939069_Perched_lobe_formation_in_the_Gulf_of_Cadiz_Interactions_between_gravity_processes_and_contour_currents_Algarve_Margin_Southern_Portugal
dc.identifier.urioai:crossref.org:10.1016/j.sedgeo.2009.03.008
dc.identifier.urioai:researchgate.net:222939069
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/203247
dc.description.abstractEnThe Gulf of Cadiz is swept by the strong saline Mediterranean Outflow Water (MOW). On the Algarve Margin (South Portugal), this current has constructed fine-grained contourite drifts. This margin is dissected by the Portimao Canyon and three short channels that only incise the upper slope, and are absent on a terrace located at mid-slope depths along the Algarve Margin. High-resolution seismic profiles and sediment cores highlight the original architecture of the sedimentary deposits on this terrace. Coarse-grained lenticular chaotic bodies formed during major relative sea-level lowstands are intercalated within the drift. The lobate shape and sandy nature of the lenticular chaotic bodies and their location at the mouths of the three short channels suggest they are gravity-generated deposits that are perched on the middle continental slope.In the Gulf of Cadiz, the interaction between contour current and gravity processes is strongly controlled by climatic variations and relative sea-level changes during the late Quaternary. During cold periods when sea-level was low, erosion intensified on the continental shelf and the deepest part of MOW was active. Sediment was transported downslope through the channels and deposited on sedimentary lobes perched on the mid-slope terrace. During warm periods when relative sea-level was high, the supply of sediment from the shelf was shut off and the shallowest part of MOW was more active. Contourite drifts fill the channels and bury the sandy lobes.
dc.language.isoENen_US
dc.sourcecrossref
dc.sourceresearchgate
dc.title.enPerched lobe formation in the Gulf of Cadiz: Interactions between gravity processes and contour currents (Algarve Margin, Southern Portugal)
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.sedgeo.2009.03.008en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalSedimentary Geologyen_US
bordeaux.page81-94en_US
bordeaux.volume229en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue3en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.identifierhal-04780857
hal.version1
hal.date.transferred2024-11-13T14:57:12Z
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=Sedimentary%20Geology&rft.date=2010-08-01&rft.volume=229&rft.issue=3&rft.spage=81-94&rft.epage=81-94&rft.eissn=0037-0738&rft.issn=0037-0738&rft.au=MARCHES,%20Elodie&MULDER,%20Thierry&GONTHIER,%20Eliane&CREMER,%20Michel&HANQUIEZ,%20Vincent&rft.genre=article


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