Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone
Core 2011804‐0010 from easternmost Lancaster Sound provides important insights into deglacial timing and style at the marine margin of the NE Laurentide Ice Sheet (LIS). Spanning 13.2–11.0 cal. ka BP and investigated for ice‐rafted debris (IRD), foraminifera, biogenic silica and total organic carbon...
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Language: | English |
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Wiley
2017
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Online Access: | https://eprints.keele.ac.uk/id/eprint/3757/ https://eprints.keele.ac.uk/id/eprint/3757/1/Furze%20et%20al.,%202017.pdf http://onlinelibrary.wiley.com/doi/10.1111/bor.12265/abstract;jsessionid=64BCFA8971D63F83FE60128A82408E0D.f04t01 https://doi.org/10.1111/bor.12265 |
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ftkeeleuniv:oai:eprints.keele.ac.uk:3757 2023-07-30T03:57:45+02:00 Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone Furze, MFA Pienkowski, AJ McNeely, MA Bennett, R Cage, AG 2017-06-23 text https://eprints.keele.ac.uk/id/eprint/3757/ https://eprints.keele.ac.uk/id/eprint/3757/1/Furze%20et%20al.,%202017.pdf http://onlinelibrary.wiley.com/doi/10.1111/bor.12265/abstract;jsessionid=64BCFA8971D63F83FE60128A82408E0D.f04t01 https://doi.org/10.1111/bor.12265 en eng Wiley https://eprints.keele.ac.uk/id/eprint/3757/1/Furze%20et%20al.,%202017.pdf Furze, MFA, Pienkowski, AJ, McNeely, MA, Bennett, R and Cage, AG orcid:0000-0001-9992-9757 (2017) Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone. Boreas, 47 (1). pp. 271-296. doi:10.1111/bor.12265 cc_by_nc_4 G Geography (General) Article PeerReviewed 2017 ftkeeleuniv https://doi.org/10.1111/bor.12265 2023-07-10T21:15:57Z Core 2011804‐0010 from easternmost Lancaster Sound provides important insights into deglacial timing and style at the marine margin of the NE Laurentide Ice Sheet (LIS). Spanning 13.2–11.0 cal. ka BP and investigated for ice‐rafted debris (IRD), foraminifera, biogenic silica and total organic carbon, the stratigraphy comprises a lithofacies progression from proximal grounding line and sub‐ice shelf environments to open glaciomarine deposition; a sequence similar to deposits from Antarctic ice shelves. These results are the first marine evidence of a former ice shelf in the eastern Northwest Passage and are consistent with a preceding phase of ice streaming in eastern Lancaster Sound. Initial glacial float‐off and retreat occurred >13.2 cal. ka BP, followed by formation of an extensive deglacial ice shelf during the Younger Dryas, which acted to stabilize the retreating margin of the NE LIS until 12.5 cal. ka BP. IRD analyses of sub‐ice shelf facies indicate initial high input from source areas on northern Baffin Island delivered to Lancaster Sound by a tributary ice stream in Admiralty Inlet. After ice shelf break‐up, Bylot Island became the dominant source area. Foraminifera are dominated by characteristic ice‐proximal glaciomarine benthics (Cassidulina reniforme, Elphidium excavatum f. clavata), complemented by advected Atlantic water (Cassidulina neoteretis, Neogloboquadrina pachyderma) and enhanced current indicators (Lobatula lobatula). The biostratigraphy further supports the ice shelf model, with advection of sparse faunas beneath the ice shelf, followed by increased productivity under open water glaciomarine conditions. The absence of Holocene sediments in the core suggests that the uppermost deposits were removed, most likely due to mass transport resulting from the site's proximity to modern tidewater glacier margins. Collectively, this study presents important new constraints on the deglacial behaviour of the NE Laurentide Ice Sheet, with implications for past ice sheet stability, ice‐rafted ... Article in Journal/Newspaper Antarc* Antarctic Baffin Island Baffin Bylot Island Ice Sheet Ice Shelf Ice Shelves Lancaster Sound Neogloboquadrina pachyderma Northwest passage Tidewater Keele University: Keele Research Repository Admiralty Inlet ENVELOPE(-86.000,-86.000,72.501,72.501) Antarctic Baffin Island Bylot Island Lancaster Sound ENVELOPE(-83.999,-83.999,74.218,74.218) Northwest Passage Boreas 47 1 271 296 |
institution |
Open Polar |
collection |
Keele University: Keele Research Repository |
op_collection_id |
ftkeeleuniv |
language |
English |
topic |
G Geography (General) |
spellingShingle |
G Geography (General) Furze, MFA Pienkowski, AJ McNeely, MA Bennett, R Cage, AG Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone |
topic_facet |
G Geography (General) |
description |
Core 2011804‐0010 from easternmost Lancaster Sound provides important insights into deglacial timing and style at the marine margin of the NE Laurentide Ice Sheet (LIS). Spanning 13.2–11.0 cal. ka BP and investigated for ice‐rafted debris (IRD), foraminifera, biogenic silica and total organic carbon, the stratigraphy comprises a lithofacies progression from proximal grounding line and sub‐ice shelf environments to open glaciomarine deposition; a sequence similar to deposits from Antarctic ice shelves. These results are the first marine evidence of a former ice shelf in the eastern Northwest Passage and are consistent with a preceding phase of ice streaming in eastern Lancaster Sound. Initial glacial float‐off and retreat occurred >13.2 cal. ka BP, followed by formation of an extensive deglacial ice shelf during the Younger Dryas, which acted to stabilize the retreating margin of the NE LIS until 12.5 cal. ka BP. IRD analyses of sub‐ice shelf facies indicate initial high input from source areas on northern Baffin Island delivered to Lancaster Sound by a tributary ice stream in Admiralty Inlet. After ice shelf break‐up, Bylot Island became the dominant source area. Foraminifera are dominated by characteristic ice‐proximal glaciomarine benthics (Cassidulina reniforme, Elphidium excavatum f. clavata), complemented by advected Atlantic water (Cassidulina neoteretis, Neogloboquadrina pachyderma) and enhanced current indicators (Lobatula lobatula). The biostratigraphy further supports the ice shelf model, with advection of sparse faunas beneath the ice shelf, followed by increased productivity under open water glaciomarine conditions. The absence of Holocene sediments in the core suggests that the uppermost deposits were removed, most likely due to mass transport resulting from the site's proximity to modern tidewater glacier margins. Collectively, this study presents important new constraints on the deglacial behaviour of the NE Laurentide Ice Sheet, with implications for past ice sheet stability, ice‐rafted ... |
format |
Article in Journal/Newspaper |
author |
Furze, MFA Pienkowski, AJ McNeely, MA Bennett, R Cage, AG |
author_facet |
Furze, MFA Pienkowski, AJ McNeely, MA Bennett, R Cage, AG |
author_sort |
Furze, MFA |
title |
Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone |
title_short |
Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone |
title_full |
Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone |
title_fullStr |
Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone |
title_full_unstemmed |
Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone |
title_sort |
deglaciation and ice shelf development at the northeast margin of the laurentide ice sheet during the younger dryas chronozone |
publisher |
Wiley |
publishDate |
2017 |
url |
https://eprints.keele.ac.uk/id/eprint/3757/ https://eprints.keele.ac.uk/id/eprint/3757/1/Furze%20et%20al.,%202017.pdf http://onlinelibrary.wiley.com/doi/10.1111/bor.12265/abstract;jsessionid=64BCFA8971D63F83FE60128A82408E0D.f04t01 https://doi.org/10.1111/bor.12265 |
long_lat |
ENVELOPE(-86.000,-86.000,72.501,72.501) ENVELOPE(-83.999,-83.999,74.218,74.218) |
geographic |
Admiralty Inlet Antarctic Baffin Island Bylot Island Lancaster Sound Northwest Passage |
geographic_facet |
Admiralty Inlet Antarctic Baffin Island Bylot Island Lancaster Sound Northwest Passage |
genre |
Antarc* Antarctic Baffin Island Baffin Bylot Island Ice Sheet Ice Shelf Ice Shelves Lancaster Sound Neogloboquadrina pachyderma Northwest passage Tidewater |
genre_facet |
Antarc* Antarctic Baffin Island Baffin Bylot Island Ice Sheet Ice Shelf Ice Shelves Lancaster Sound Neogloboquadrina pachyderma Northwest passage Tidewater |
op_relation |
https://eprints.keele.ac.uk/id/eprint/3757/1/Furze%20et%20al.,%202017.pdf Furze, MFA, Pienkowski, AJ, McNeely, MA, Bennett, R and Cage, AG orcid:0000-0001-9992-9757 (2017) Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone. Boreas, 47 (1). pp. 271-296. doi:10.1111/bor.12265 |
op_rights |
cc_by_nc_4 |
op_doi |
https://doi.org/10.1111/bor.12265 |
container_title |
Boreas |
container_volume |
47 |
container_issue |
1 |
container_start_page |
271 |
op_container_end_page |
296 |
_version_ |
1772819204102160384 |