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      Lateglacial and Holocene sedimentary dynamics in northwestern Baffin Bay as recorded in sediment cores from Cape Norton Shaw Inlet (Nunavut, Canada)

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          Abstract

          The physical, sedimentological, mineralogical and elemental geochemical properties of sediment cores AMD1803‐02BC and 01PC from the Cape Norton Shaw Inlet were investigated to reconstruct glacial sediment discharges from southeastern Manson Icefield and document the impact of ice–ocean interactions on the sediment dynamics and opening of the North Water Polynya (NOW) in northwestern Baffin Bay since the last deglaciation. Laminated glaciomarine sediments rich in quartz and feldspar are observed prior to 11 cal. ka BP and were probably deposited by hyperpycnal currents triggered by the local retreat of the southern margin of the Innuitian Ice. Detrital proxies suggest that Early Holocene sediment dynamics were mainly influenced by sea ice and iceberg rafting and meltwater discharges related to the deglaciation of eastern Smith (~11 to 10.65 cal. ka BP) and Jones (~10.7 cal. ka BP) sounds. This also provides an upper limit to the timing of formation of the NOW. The high detrital carbonate contents during 8.8 to 6.6 cal. ka BP confirm that enhanced carbonate‐rich sediment export from Nares Strait to northern Baffin Bay occurred during and after the deglaciation of Kennedy Channel (8.8 to 8.2 cal. ka BP). Canadian Shield sediment inputs have dominated since 6.6 cal. ka BP, indicating that sedimentation is mainly influenced by Cape Norton Shaw glacier discharges. The lower level of sedimentation recorded in core 01PC during the Middle to Late Holocene suggests an accelerated landward retreat of the Cape Norton Shaw glaciers in response to warmer marine conditions. During the Neoglacial period, higher sedimentation rates and detrital proxies in the cores suggest increased glacial erosional processes, probably associated with the long‐term declines in boreal summer insolation and glacier growth. Finally, mineralogical and grain‐size data in core 02BC support the idea that increased Arctic atmospheric temperatures have had an important influence on the glacial dynamics during the industrial period.

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          • Record: found
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          The role of sea ice and other fresh water in the Arctic circulation

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            • Record: found
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            • Article: not found

            A long-term numerical solution for the insolation quantities of the Earth

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              • Record: found
              • Abstract: not found
              • Article: not found

              Insolation values for the climate of the last 10 million years

                Bookmark

                Author and article information

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                Journal
                Boreas
                Boreas
                Wiley
                0300-9483
                1502-3885
                July 2022
                December 17 2021
                July 2022
                : 51
                : 3
                : 532-552
                Affiliations
                [1 ] Laboratoire des Sciences du Climat et de l’Environnement/Institut Pierre Simon Laplace CEA‐CNRS‐UVSQ Université Paris‐Saclay Orme des Merisiers 91191 Gif‐sur‐Yvette France
                [2 ] Université de Bordeaux CNRS EPOC EPHE UMR 5805 Allée Geoffroy Saint‐Hilaire 33615 Pessac France
                [3 ] Institut des sciences de la mer de Rimouski Université du Québec à Rimouski, Québec‐Océan and Geotop 310 allée des Ursulines Rimouski QC G5L 3A1 Canada
                [4 ] Department of Geography Environment and Geomatics University of Ottawa Ottawa Ontario K1N 6N5 Canada
                Article
                10.1111/bor.12575
                fa1f6e66-a5d5-489f-b7f9-3bbfde71592d
                © 2022

                http://creativecommons.org/licenses/by-nc-nd/4.0/

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