Fine scale sediment structure and geochemical signature between eastern and western North Atlantic during Heinrich events 1 and 2
Heinrich iceberg-rafting events 1 and 2 (H1 and H2) in the Labrador Sea are identified by their typical nepheloid-flow deposit sedimentary structure, high bulk carbonate, increase in iceberg-rafted detritus (IRD), and depletion of delta O-18 in the surface-dwelling foraminifer, Neogloboquadrina pach...
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ftarchimer:oai:archimer.ifremer.fr:37641 2023-05-15T15:35:08+02:00 Fine scale sediment structure and geochemical signature between eastern and western North Atlantic during Heinrich events 1 and 2 Rashid, H. Saint-ange, Francky Barber, D. C. Smith, M. E. Devalia, N. 2012-07 application/pdf https://archimer.ifremer.fr/doc/00265/37641/36841.pdf https://archimer.ifremer.fr/doc/00265/37641/36842.pdf https://doi.org/10.1016/j.quascirev.2012.04.026 https://archimer.ifremer.fr/doc/00265/37641/ eng eng Pergamon-elsevier Science Ltd https://archimer.ifremer.fr/doc/00265/37641/36841.pdf https://archimer.ifremer.fr/doc/00265/37641/36842.pdf doi:10.1016/j.quascirev.2012.04.026 https://archimer.ifremer.fr/doc/00265/37641/ 2012 Published by Elsevier Ltd. All rights reserved info:eu-repo/semantics/openAccess restricted use Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2012-07 , Vol. 46 , P. 136-150 Heinrich iceberg-rafting Radiogenic isotopes Cumberland sound ice-shelf Hudson Strait ice-stream Trinity Trough ice-stream text Publication info:eu-repo/semantics/article 2012 ftarchimer https://doi.org/10.1016/j.quascirev.2012.04.026 2021-09-23T20:26:12Z Heinrich iceberg-rafting events 1 and 2 (H1 and H2) in the Labrador Sea are identified by their typical nepheloid-flow deposit sedimentary structure, high bulk carbonate, increase in iceberg-rafted detritus (IRD), and depletion of delta O-18 in the surface-dwelling foraminifer, Neogloboquadrina pachyderma (s). H-layers in this region have sedimentological characteristics different than those in the North Atlantic, and consist of IRD interspersed in pelagic sediments. High resolution C-14-AMS dates allowed us to delineate the leads and lags in instability between different ice-streams of the former Laurentide ice-sheet (LIS). Our data suggest that the discharge from the Hudson Strait ice-stream was followed by Cumberland Sound ice-sheet during H1 and H2. New radiogenic isotopes from the ice-proximal and surficial sediments of the greater Hudson Strait region and Labrador Sea H0, H1 and H2 layers suggest that carbonate-rich layers were only derived from Hudson Strait, not Baffin Bay. Fine scale structure of H1 and H2 intervals in Labrador Sea slope cores is characterized by two lithic peaks dominated by detrital carbonate grains and a single peak in cores from the central Labrador Sea. A similar pattern in the structure of H1 and H2 is observed along the western European margin. These findings contrast with North Atlantic H1 and H2 intervals, which are characterized by a peak of carbonate-rich grains, followed by a peak of quartz and volcanic grains. This comparison with North Atlantic and western European margin cores leads us to suggest that the coupling or lack thereof, between the LIS and European ice-sheet, is related to the depositional processes occurring along the margins, as well as the distance from the sources and the ability of the oceanic currents to disperse icebergs. Any significant change in ice-sheet dynamics would be recorded close to the ice-sheet margin, while distal locations would only record extreme events. We hypothesize that the discordance between the findings reported in the literature is most likely similar to the difference between the upper slope/deep Labrador sites and the Flemish Pass site described in this contribution but requires vigorous testing. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Cumberland Sound Hudson Strait Ice Sheet Ice Shelf Labrador Sea Neogloboquadrina pachyderma North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Baffin Bay Cumberland Sound ENVELOPE(-66.014,-66.014,65.334,65.334) Hudson Hudson Strait ENVELOPE(-70.000,-70.000,62.000,62.000) Quaternary Science Reviews 46 136 150 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Heinrich iceberg-rafting Radiogenic isotopes Cumberland sound ice-shelf Hudson Strait ice-stream Trinity Trough ice-stream |
spellingShingle |
Heinrich iceberg-rafting Radiogenic isotopes Cumberland sound ice-shelf Hudson Strait ice-stream Trinity Trough ice-stream Rashid, H. Saint-ange, Francky Barber, D. C. Smith, M. E. Devalia, N. Fine scale sediment structure and geochemical signature between eastern and western North Atlantic during Heinrich events 1 and 2 |
topic_facet |
Heinrich iceberg-rafting Radiogenic isotopes Cumberland sound ice-shelf Hudson Strait ice-stream Trinity Trough ice-stream |
description |
Heinrich iceberg-rafting events 1 and 2 (H1 and H2) in the Labrador Sea are identified by their typical nepheloid-flow deposit sedimentary structure, high bulk carbonate, increase in iceberg-rafted detritus (IRD), and depletion of delta O-18 in the surface-dwelling foraminifer, Neogloboquadrina pachyderma (s). H-layers in this region have sedimentological characteristics different than those in the North Atlantic, and consist of IRD interspersed in pelagic sediments. High resolution C-14-AMS dates allowed us to delineate the leads and lags in instability between different ice-streams of the former Laurentide ice-sheet (LIS). Our data suggest that the discharge from the Hudson Strait ice-stream was followed by Cumberland Sound ice-sheet during H1 and H2. New radiogenic isotopes from the ice-proximal and surficial sediments of the greater Hudson Strait region and Labrador Sea H0, H1 and H2 layers suggest that carbonate-rich layers were only derived from Hudson Strait, not Baffin Bay. Fine scale structure of H1 and H2 intervals in Labrador Sea slope cores is characterized by two lithic peaks dominated by detrital carbonate grains and a single peak in cores from the central Labrador Sea. A similar pattern in the structure of H1 and H2 is observed along the western European margin. These findings contrast with North Atlantic H1 and H2 intervals, which are characterized by a peak of carbonate-rich grains, followed by a peak of quartz and volcanic grains. This comparison with North Atlantic and western European margin cores leads us to suggest that the coupling or lack thereof, between the LIS and European ice-sheet, is related to the depositional processes occurring along the margins, as well as the distance from the sources and the ability of the oceanic currents to disperse icebergs. Any significant change in ice-sheet dynamics would be recorded close to the ice-sheet margin, while distal locations would only record extreme events. We hypothesize that the discordance between the findings reported in the literature is most likely similar to the difference between the upper slope/deep Labrador sites and the Flemish Pass site described in this contribution but requires vigorous testing. |
format |
Article in Journal/Newspaper |
author |
Rashid, H. Saint-ange, Francky Barber, D. C. Smith, M. E. Devalia, N. |
author_facet |
Rashid, H. Saint-ange, Francky Barber, D. C. Smith, M. E. Devalia, N. |
author_sort |
Rashid, H. |
title |
Fine scale sediment structure and geochemical signature between eastern and western North Atlantic during Heinrich events 1 and 2 |
title_short |
Fine scale sediment structure and geochemical signature between eastern and western North Atlantic during Heinrich events 1 and 2 |
title_full |
Fine scale sediment structure and geochemical signature between eastern and western North Atlantic during Heinrich events 1 and 2 |
title_fullStr |
Fine scale sediment structure and geochemical signature between eastern and western North Atlantic during Heinrich events 1 and 2 |
title_full_unstemmed |
Fine scale sediment structure and geochemical signature between eastern and western North Atlantic during Heinrich events 1 and 2 |
title_sort |
fine scale sediment structure and geochemical signature between eastern and western north atlantic during heinrich events 1 and 2 |
publisher |
Pergamon-elsevier Science Ltd |
publishDate |
2012 |
url |
https://archimer.ifremer.fr/doc/00265/37641/36841.pdf https://archimer.ifremer.fr/doc/00265/37641/36842.pdf https://doi.org/10.1016/j.quascirev.2012.04.026 https://archimer.ifremer.fr/doc/00265/37641/ |
long_lat |
ENVELOPE(-66.014,-66.014,65.334,65.334) ENVELOPE(-70.000,-70.000,62.000,62.000) |
geographic |
Baffin Bay Cumberland Sound Hudson Hudson Strait |
geographic_facet |
Baffin Bay Cumberland Sound Hudson Hudson Strait |
genre |
Baffin Bay Baffin Bay Baffin Cumberland Sound Hudson Strait Ice Sheet Ice Shelf Labrador Sea Neogloboquadrina pachyderma North Atlantic |
genre_facet |
Baffin Bay Baffin Bay Baffin Cumberland Sound Hudson Strait Ice Sheet Ice Shelf Labrador Sea Neogloboquadrina pachyderma North Atlantic |
op_source |
Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2012-07 , Vol. 46 , P. 136-150 |
op_relation |
https://archimer.ifremer.fr/doc/00265/37641/36841.pdf https://archimer.ifremer.fr/doc/00265/37641/36842.pdf doi:10.1016/j.quascirev.2012.04.026 https://archimer.ifremer.fr/doc/00265/37641/ |
op_rights |
2012 Published by Elsevier Ltd. All rights reserved info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.quascirev.2012.04.026 |
container_title |
Quaternary Science Reviews |
container_volume |
46 |
container_start_page |
136 |
op_container_end_page |
150 |
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1766365428375879680 |