Deglacial laminated facies on the NW European continental margin: The hydrographic significance of British-Irish Ice Sheet deglaciation and Fleuve Manche paleoriver discharges

• Published in: Geochemistry, Geophysics, Geosystems
• Main Authors: Eynaud, F., Zaragosi, S., Scourse, J, Mojtahid, M., Bourillet, J, Hall, I, Penaud, A., Locascio, M., Reijonen, A.
• Other Authors: Environnements et Paléoenvironnements OCéaniques (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), School of Ocean Sciences, University of Wales (Bangor), Bio-Indicateurs Actuels et Fossiles (BIAF), Université d'Angers (UA), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Cardiff University, Flotte océanographique françaiseThe ARTEMIS 14C Accelerator Mass Spectrometry French projectSHOM, ANR-05-BLAN-0310,IDEGLACE,Impact de Décharges d'Eau douce provenant de la GLace continentale sur le Climat Européen et méditerranéen(2005)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2007
• Subjects: Celtic margin; glacial terminations; laminated sediments; freshwater pulse/discharge; ice-rafted detritus; planktonic microfossils; [SDU]Sciences of the Universe [physics]; Ice Sheet
• Online Access: https://hal.science/hal-03974781; https://hal.science/hal-03974781/document; https://hal.science/hal-03974781/file/4_Eynaud_etal_2007.pdf; https://doi.org/10.1029/2006GC001496

International audience We have compiled results obtained from four high sedimentation rate hemipelagic sequences from the Celtic sector of the NW European margin (NE Atlantic) to investigate the paleoceanographic and paleoclimatic evolution of the area over the last few climatic cycles. We focus on periods characteristic of deglacial transitions. We adopt a multiproxy sedimentological, geochemical, and micropaleontological approach, applying a sampling resolution down to ten microns for specific intervals. The investigation demonstrates the relationships between the Bay of Biscay hydrography and the glacial/deglacial history of both the proximal British-Irish Ice Sheet (BIIS) and the western European continent. We identify recurrent phases of laminae deposition concurrent with major BIIS deglacial episodes in all the studied cores. Evidence for abrupt freshwater discharges into the open ocean highlights the influence of such events at a regional scale. We discuss their impact at a global scale considering the present and past key location of the Bay of Biscay versus the Atlantic Meridional Overturning Circulation (AMOC).