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An exceptional record of soft-sediment deformation within Pliocene deposits of Faro Drift (SW Iberia margin) - IODP Expedition 339 Sites U1386 and U1387

dc.rights.licenseopenen_US
dc.contributor.authorROQUE, Cristina
dc.contributor.authorGAMBOA, Davide
dc.contributor.authorROSAS, Filipe M.
dc.contributor.authorNISHIDA, Naohisa
dc.contributor.authorDUARTE, Débora
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDUCASSOU, Emmanuelle
dc.date.accessioned2025-04-24T07:33:50Z
dc.date.available2025-04-24T07:33:50Z
dc.date.issued2024-08
dc.identifier.issn0025-3227en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/206381
dc.description.abstractEnThe occurrence of soft-sediment deformation structures (SSDS) have long been recognized in several types of sedimentary environments and deposits. However, their presence in contourite drift deposits is still unreported in the literature. In this work, we present the first detailed description of SSDS found within the Pliocene sedimentary record of the Faro Drift, recovered during the Integrated Ocean Drilling Program (IODP) Expedition 339. The Faro Drift is the largest contourite drift of the Contourite Drift Depositional System developed in the Gulf of Cadiz since the Late Miocene by the circulation of the Mediterranean Outflow Water. The SSDS were identified in archive-halves of core sections located between ∼458 and ∼ 510 m below seafloor (mbsf) (hole U1386C), and between ∼599 and ∼ 670 mbsf (hole U1387C). Their identification and characterization was made by visual core description, structural geometrical analysis in core-scan high-resolution images, and scanning electron microcopy (SEM) analysis in selected intervals. The SSDS were classified based on the exhibited geometry, structural configuration and respective kinematics. The main deformation process and potential trigger were inferred from the geometrical and kinematics analysis. We identified five categories of SSDS: i) microfaults (normal and thrust faults), ii) slump sheet (formed by several types of folds, such as eye-folds, fish-hook folds, spiral folds), iii) convolute bedding, iv) folds within debrite mudclasts', and v) sigmoidal-like structures. Although the first three are well known types of SSDS, the folds within debrite mudclasts' and sigmoid-like structures have been scarcely recognized and described at core-scale. The inferred deformation processes responsible for the formation of these SSDS were i) brittle deformation by hydrofracturing and compaction faulting (microfaults), ii) hydroplastic (ductile) deformation (slump folds, folds within debrite mudclasts'), iii) liquefaction (convolute bedding), iv) shearing by flow movement (sigmoid-like structures). The most probable triggering agents seem to have been overloading, downslope movement of slump sheet and debris flow, and shearing by currents.
dc.language.isoENen_US
dc.title.enAn exceptional record of soft-sediment deformation within Pliocene deposits of Faro Drift (SW Iberia margin) - IODP Expedition 339 Sites U1386 and U1387
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.margeo.2024.107335en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalMarine Geologyen_US
bordeaux.page107335en_US
bordeaux.volume474en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamGEOLSEDen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcecrossref
hal.identifierhal-05044971
hal.version1
hal.date.transferred2025-04-24T07:33:52Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
workflow.import.sourcecrossref
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=2024-08&rft.volume=474&rft.spage=107335&rft.epage=107335&rft.eissn=0025-3227&rft.issn=0025-3227&rft.au=ROQUE,%20Cristina&GAMBOA,%20Davide&ROSAS,%20Filipe%20M.&NISHIDA,%20Naohisa&DUARTE,%20D%C3%A9bora&rft.genre=article


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