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TitreAlong-slope variations in sediment lithofacies and depositional processes since the Last Glacial Maximum on the northeast Baffin margin, Canada
AuteurJenner, K A; Campbell, D C; Piper, D J W
SourceMarine Geology vol. 405, 2018 p. 92-107, https://doi.org/10.1016/j.margeo.2018.07.012
Année2018
Séries alt.Ressources naturelles Canada, Contribution externe 20170321
ÉditeurElsevier BV
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/j.margeo.2018.07.012
Mediapapier; en ligne; numérique
Formatspdf (Adobe® Reader®); html
ProvinceNunavut; Région extracotière du nord
SNRC16; 26A; 26G; 26H; 26I; 26J; 27; 28A; 28B; 28C; 28D; 28E; 28F; 37H; 38A; 38B; 38C; 38D
Lat/Long OENS -80.0000 -54.0000 75.0000 64.3333
Sujetsmarges continentales; plate-forme continentale; talus continental; sédiments marins; boues; sables; argiles; turbidites; graviers; dépôts glaciaires; dépôts de glissement de terrain; dépôts de coulée de débris; glissements; lithofaciès; carbonates; antécédents géologiques; antecedents de sedimentation; milieu sédimentaire; dispersion des sédiments; régions émettrices; antecedents glaciaires; glaciation; Wisconsinien; marges glaciaires; déglaciation; carottes de sédiment marin; bioturbation; courants; courants de turbidite; courants de fond; transport par radeaux de glace; icebergs; bassins; datation radiométrique; datation au radiocarbone; structures sédimentaires; analyses stratigraphiques; corrélations stratigraphiques; lithostratigraphie; paléoenvironnement; dépressions; interprétations géophysiques; levés acoustiques marins; analyses granulométriques; repartition granulométrique; Plate-Forme de Baffin; courants glaciaires; limites de glaciation; dépôts de versants; géologie marine; géologie des dépôts meubles/géomorphologie; stratigraphie; géochronologie; géophysique; Sciences et technologie; Nature et environnement; Phanérozoïque; Cénozoïque; Quaternaire
Illustrationsgeoscientific sketch maps; location maps; geophysical profiles; tables; lithologic sections; correlation sections; photographs; geophysical images; plots
ProgrammeGéo-risques marins, Géoscience pour la sécurité publique
Diffusé2018 07 26
Résumé(disponible en anglais seulement)
Twelve piston cores were used to characterize late Quaternary lithofacies, depositional processes and deglacial history along the Baffin Bay slope between Lancaster Sound and Home Bay. Core investigations show four distinct laterally correlatable lithofacies along the slope - basal and upper diamicton, laminated red brown mud, tan carbonate gravelly, sandy mud and bioturbated brown mud. Basal diamicton largely represents glacigenic debris flow deposits during a glacial advance from Baffin Island at ~25 cal ka. The distribution and character of laminated red brown mud suggests a lateral supply to Baffin Bay slope from ice-proximal meltwater plumes and turbidity currents sourced in glacial ice from both Baffin Bay shelf and Home Bay between 41.5 cal ka to ~14.2 cal ka. An upper diamicton records a lesser, localized glacial advance that ended at about 14.2 cal ka. Tan carbonate mud events represent ice-rafted, enhanced detrital carbonate delivery to the slope between ~25 cal ka and ~11 cal ka. A gradual thinning of these events, from northern to southern Baffin Bay, corroborates a northern Baffin Bay, Lancaster Sound or Nares Strait iceberg source. Proglacial facies seaward of Home Bay contain beds with slightly elevated detrital carbonate that may represent the distal edge of carbonate ice-rafted from Lancaster Sound. Baffin Bay is a type example of a polar glacial basin in which direct glacial supply predominates over the effects of glacial meltwater. As a result, axial supply from the large ice streams north of Baffin Bay (particularly Lancaster Sound) is dominant in the Baffin Bay basin and lateral supply from smaller ice streams on Baffin Island predominates on the NE Baffin Slope.
Résumé(Résumé en langage clair et simple, non publié)
Treize carottes prélevées par piston caractérisent le lithofaciès, les processus de déposition et l'historique de la déglaciation du Quaternaire supérieur, le long de la pente de la baie de Baffin entre le détroit de Lancaster et la baie Home.
GEOSCAN ID306414