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What forced the collapse of European ice sheets during the last two glacial periods (150 ka BP and 18 ka cal BP)? Palynological evidence

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPENAUD, Aurelie
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorEYNAUD, Frederique
IDREF: 144113570
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorTURON, Jean Louis
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorZARAGOSI, Sebastien
IDREF: 189039159
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMALAIZE, Bruno
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorTOUCANNE, Samuel
hal.structure.identifierInstitut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
hal.structure.identifierGeo-Ocean [GEO-OCEAN]
dc.contributor.authorBOURILLET, Jean-Francois
dc.date.accessioned2024-11-13T14:25:19Z
dc.date.available2024-11-13T14:25:19Z
dc.date.issued2009-10-01
dc.identifier.issn0031-0182en_US
dc.identifier.urihttps://www.researchgate.net/publication/44105348_What_forced_the_collapse_of_European_ice_sheets_during_the_last_two_glacial_periods_150_ka_BP_and_18_ka_cal_BP_Palynological_evidence
dc.identifier.urioai:researchgate.net:44105348
dc.identifier.urioai:crossref.org:10.1016/j.palaeo.2009.07.012
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/203242
dc.description.abstractEnWe present a new marine palynological record from the temperate North-eastern Atlantic (core MD03-2692, Celtic-Armorican margin) in the area of influence of the 'Fleuve Manche' paleoriver during glacial times. The runoff of this paleoriver was connected to the glacial history of European ice sheets (including the British Irish Ice Sheet-BIIS). Our study conducted on dinoflagellate cysts assemblages over the last 200 ka, associated with quantification of palynological remains reflecting continental influence (pre-Quaternary dinocysts and micro-algae Pediastrum spp. coenobia), yields detailed insights into the sea-surface paleoenvironments of this sector. More specifically, mechanisms responsible for the origin of unusual deposits of laminated sequences found at the end of Marine Isotope Stage (MIS) 2 and within mid-MIS 6 are here constrained. We provide evidence of genetic similarities between fluvial discharges occurring before and during times of deposition of the laminated deposits. Our study clarifies the causes of the collapse of European glaciated systems. At the end of MIS 2, prior to the deposition of the laminated deposits, pleni-oceanic influence characterized by high concentrations of Quaternary dinocysts prevailed, and a dinocyst species tracing the penetration of the warm North Atlantic Drift into the Bay of Biscay is recorded. However, this scenario did not recur prior to the deposition of laminated sediments of mid-MIS 6. In addition, contrary to the laminated deposits found at the end of MIS 2 and directly associated with Termination I, MIS 6 laminae appeared 20 ka earlier than Termination II. Our work shows that, during the penultimate glacial stage, the collapse of mid-latitudes ice sheets around 170 ka B.P. may have immediately followed the MIS 6.5 warming phase. Then, the most important melting event around 150 ka B.P. may be linked to a peak in insolation at 65°N, though less important than those during MIS 6.5 and Termination II.
dc.language.isoENen_US
dc.sourceresearchgate
dc.sourcecrossref
dc.title.enWhat forced the collapse of European ice sheets during the last two glacial periods (150 ka BP and 18 ka cal BP)? Palynological evidence
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.palaeo.2009.07.012en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalPalaeogeography, Palaeoclimatology, Palaeoecologyen_US
bordeaux.page66-78en_US
bordeaux.volume281en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue1-2en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.identifierhal-04780740
hal.version1
hal.date.transferred2024-11-13T14:25:22Z
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=Palaeogeography,%20Palaeoclimatology,%20Palaeoecology&rft.date=2009-10-01&rft.volume=281&rft.issue=1-2&rft.spage=66-78&rft.epage=66-78&rft.eissn=0031-0182&rft.issn=0031-0182&rft.au=PENAUD,%20Aurelie&EYNAUD,%20Frederique&TURON,%20Jean%20Louis&ZARAGOSI,%20Sebastien&MALAIZE,%20Bruno&rft.genre=article


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