|Deglacial laminated facies on the NW European continental margin: The hydrographic significance of British-Irish Ice Sheet deglaciation and Fleuve Manche paleoriver discharges
|Year of Publication
|Eynaud, F, Zaragosi, S, Scourse, JD, Mojtahid, M, Bourillet, JF, Hall, IR, Penaud, A, Locascio, M, Reijonen, A
|Geochem. Geophys. Geosyst.
|4901 Paleoceanography: Abrupt/rapid climate change, 4926 Paleoceanography: Glacial, 4944 Paleoceanography: Micropaleontology, Celtic margin, freshwater pulse/discharge, glacial terminations, ice-rafted detritus, laminated sediments, planktonic microfossils
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).