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TitreThe role of Hudson Strait outlet in Younger Dryas sedimentation in the Labrador Sea
AuteurRashid, H; Piper, D J W; Flower, B P
SourceAbrupt Climate Change: Mechanisms, Patterns, and Impacts; par Rashid, H (éd.); Polyak, L (éd.); Mosley-Thompson, E (éd.); Geophysical Monograph Series vol. 193, 2011 p. 93-110, https://doi.org/10.1029/2010GM001011
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090094
ÉditeurAmerican Geophysical Union
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1029/2010GM001011
Mediapapier; en ligne; numérique
Formatspdf
ProvinceRégion extracotière de l'est; Région extracotière du nord
Lat/Long OENS -70.0000 -40.0000 64.0000 48.0000
Sujetsdistribution des sédiments; sedimentation; sédiments marins; transport des sediments; marges glaciaires; changement climatique; géologie des dépôts meubles/géomorphologie; géologie marine; Nature et environnement; Cénozoïque; Quaternaire
Illustrationslocation maps; profiles; tables; cartoons
ProgrammeAléas géologiques et contraintes à la mise en valeur des ressources extracôtières, Géosciences à l'appui de la gestion des océans
Résumé(disponible en anglais seulement)
In the Younger Dryas (YD) the circum-North Atlantic region returned to near glacial conditions, widely attributed to the release of fresh water from the Laurentide Ice Sheet (LIS). Hudson Strait was a major outlet for fresh water, icebergs, and sediment from the LIS that deposited Heinrich (H) layers throughout the North Atlantic. Heinrich layer 0 (H0), the YD equivalent ice-rafting event, has been reported to be absent in deep water seaward of the mouth of Hudson Strait. We have identified meter-thick H0 carbonate-rich sediments of YD age seaward of Hudson Strait as nepheloid-flow deposits and as turbidites on the northeast Sohm Abyssal Plain. Otherwise, H0 is generally absent in cores from the Labrador Basin. The thick proximal H0 bed indicates an important supply of fresh water through the Hudson Strait outlet of the LIS during the YD. The sparse distal sediment distribution and values in the planktonic foraminiferal ?18O in the Labrador Sea, less depleted than during H1, were probably the result of the position of the ice margin, duration of freshwater discharge, and dilution of freshwater signature with the ambient seawater during H0. This change is interpreted to result from differences in the retreat of the ice margin at the mouth of Hudson Strait, resulting in different styles of sediment and freshwater transport during the H0 compared to earlier H events.
GEOSCAN ID247442