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Activity of the turbidite levees of the Celtic-Armorican margin (Bay of Biscay) during the last 30,000 years: Imprints of the last European deglaciation and Heinrich events ArchiMer
Toucanne, Samuel; Zaragosi, S; Bourillet, Jean-francois; Naughton, F; Cremer, M; Eynaud, F; Dennielou, Bernard.
High-resolution sedimentological and micropaleontological studies of several deep-sea cores retrieved from the levees of the Celtic and Armorican turbidite systems (Bay of Biscay - North Atlantic Ocean) allow the detection of the major oscillations of the British-Irish Ice Sheet (BIIS) and 'Fleuve Manche' palaeoriver discharges over the last 30,000 years, which were mainly triggered by climate changes. Between 30 and 20 cal ka, the turbiditic activity on the Celtic-Annorican margin was weak, contrasting with previous stratigraphic models which predicted a substantial increase of sediment supply during low sea-level stands. This low turbidite deposit frequency was most likely the result of a weak activity of the 'Fleuve Manche' palaeoriver and/or of a...
Tipo: Text Palavras-chave: Turbidites; Heinrich events; LGM; Last deglaciation; Palaeoriver; Fleuve Manche; British irish ice sheet; Bay of Biscay.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3729.pdf
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Deglacial laminated facies on the NW European continental margin: The hydrographic significance of British-Irish Ice Sheet deglaciation and Fleuve Manche paleoriver discharges ArchiMer
Eynaud, F; Zaragosi, S; Scourse, J; Mojtahid, M; Bourillet, Jean-francois; Hall, I. R.; Penaud, A; Locascio, M; Reijonen, A.
[1] 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...
Tipo: Text Palavras-chave: Paleoceanography : micropaleontology; Paleoceanography : abrupt/rapid climate change; Paleoceanography : glacial; Planktonic microfossils; Ice rafted detritus; Freshwater pulse/discharge; Laminated sediments; Glacial terminations; Celtic margin.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2606.pdf
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Interglacial variability (MIS 5 and MIS 7) and dinoflagellate cyst assemblages in the Bay of Biscay (North Atlantic) ArchiMer
Penaud, A; Eynaud, F; Turon, J; Zaragosi, S; Marret, F; Bourillet, Jean-françois.
The interglacial periods of the late Quaternary are frequently investigated as they constitute potential analogues for our modem climate and may shed light on the key questions of natural climate variability and future developments. The aim of this work is to reconstruct the paleoenvironmental history of Marine Isotope Stages (MIS) 5 and 7 in deep-sea sediments of the northern Bay of Biscay (North East Atlantic Ocean). On the basis of a multiproxy compilation, including analysis of dinoflagellate cyst assemblages, we discuss the nature of the paleoenvironmental and paleoclimate changes that took place in this region. Recurrent successions Of Species marking the beginning and the Termination of the Interglacial Complexes (MIS 5 and MIS 7) revealed a...
Tipo: Text Palavras-chave: Climatic optima; Interglacial Complexes; Marine Isotope Stages MIS 5 and 7; Celtic Armorican margin; Foraminifera; Dinoflagellate cysts.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-5020.pdf
Registros recuperados: 3
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