Mega‐scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations
Mega‐scale glacial lineations formed by the raking of ice shelves across the seafloor have been reported from multiple polar regions. Here, we present the first evidence of continental slope situated buried lineations in the southern Canadian Beaufort Sea in present‐day water depths of 220 – 800 m....
Published in: | Earth Surface Processes and Landforms |
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Format: | Article in Journal/Newspaper |
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Wiley
2021
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Online Access: | https://oceanrep.geomar.de/id/eprint/52501/ https://oceanrep.geomar.de/id/eprint/52501/7/esp5125-sup-0001-data_s1.docx https://oceanrep.geomar.de/id/eprint/52501/9/esp.5125.pdf https://doi.org/10.1002/esp.5125 |
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ftoceanrep:oai:oceanrep.geomar.de:52501 2024-02-11T09:55:16+01:00 Mega‐scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations Riedel, Michael Dallimore, Scott Wamsteeker, Michael Taylor, Gary King, Edward L. Rohr, Kristin M. M. Hong, Jong Kuk Jin, Young Keun 2021-06-30 text https://oceanrep.geomar.de/id/eprint/52501/ https://oceanrep.geomar.de/id/eprint/52501/7/esp5125-sup-0001-data_s1.docx https://oceanrep.geomar.de/id/eprint/52501/9/esp.5125.pdf https://doi.org/10.1002/esp.5125 en eng Wiley https://oceanrep.geomar.de/id/eprint/52501/7/esp5125-sup-0001-data_s1.docx https://oceanrep.geomar.de/id/eprint/52501/9/esp.5125.pdf Riedel, M. , Dallimore, S., Wamsteeker, M., Taylor, G., King, E. L., Rohr, K. M. M., Hong, J. K. and Jin, Y. K. (2021) Mega‐scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations. Open Access Earth Surface Processes and Landforms, 46 (8). pp. 1568-1585. DOI 10.1002/esp.5125 <https://doi.org/10.1002/esp.5125>. doi:10.1002/esp.5125 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1002/esp.5125 2024-01-15T00:23:30Z Mega‐scale glacial lineations formed by the raking of ice shelves across the seafloor have been reported from multiple polar regions. Here, we present the first evidence of continental slope situated buried lineations in the southern Canadian Beaufort Sea in present‐day water depths of 220 – 800 m. Three separate surfaces with lineations are defined at sub‐seafloor depths of 40 m to 390 m. All lineations are mostly parallel to the general trend of slope contours. The uppermost surface is recognized over a distance of 56 km. In water depths > 500 m the lineations are parallel to each other at a consistent direction (43° ‐ 44°). The second lineated surface is a regionally occurring erosional unconformity. This event has two sub‐sets of lineations: mid‐slope situated lineations oriented at 42‐48°, and lineations closer to the continental shelf break at 55° ‐ 59°. The third lineated surface is an unconformable horizon buried up to 390 m below seafloor with lineaments oriented between 30° and 55°. All three sets of lineations are interpreted to have been produced by ice‐ploughing on the paleo‐seafloor through the grounding of an ice shelf. Our observations are similar to those documented along the slope off northern Alaska, Chukchi Rise, and Lomonosov Ridge. Collectively, these observations support the concept of an extensive ice shelf across the Arctic Ocean that grounded locally along its margins during multiple glaciations, including during the penultimate (or an earlier) glaciation. The youngest set of lineations indicates ice movement to the southwest with a suggested source in Amundsen Gulf and/or M’Clure Strait. Tentative age considerations for these youngest lineations indicate the first evidence for an analogous extensive ice shelf configuration for the last glacial maximum. Article in Journal/Newspaper Amundsen Gulf Arctic Arctic Ocean Beaufort Sea Chukchi Ice Shelf Ice Shelves Lomonosov Ridge Alaska OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean Chukchi Rise ENVELOPE(-165.000,-165.000,78.000,78.000) Earth Surface Processes and Landforms 46 8 1568 1585 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Mega‐scale glacial lineations formed by the raking of ice shelves across the seafloor have been reported from multiple polar regions. Here, we present the first evidence of continental slope situated buried lineations in the southern Canadian Beaufort Sea in present‐day water depths of 220 – 800 m. Three separate surfaces with lineations are defined at sub‐seafloor depths of 40 m to 390 m. All lineations are mostly parallel to the general trend of slope contours. The uppermost surface is recognized over a distance of 56 km. In water depths > 500 m the lineations are parallel to each other at a consistent direction (43° ‐ 44°). The second lineated surface is a regionally occurring erosional unconformity. This event has two sub‐sets of lineations: mid‐slope situated lineations oriented at 42‐48°, and lineations closer to the continental shelf break at 55° ‐ 59°. The third lineated surface is an unconformable horizon buried up to 390 m below seafloor with lineaments oriented between 30° and 55°. All three sets of lineations are interpreted to have been produced by ice‐ploughing on the paleo‐seafloor through the grounding of an ice shelf. Our observations are similar to those documented along the slope off northern Alaska, Chukchi Rise, and Lomonosov Ridge. Collectively, these observations support the concept of an extensive ice shelf across the Arctic Ocean that grounded locally along its margins during multiple glaciations, including during the penultimate (or an earlier) glaciation. The youngest set of lineations indicates ice movement to the southwest with a suggested source in Amundsen Gulf and/or M’Clure Strait. Tentative age considerations for these youngest lineations indicate the first evidence for an analogous extensive ice shelf configuration for the last glacial maximum. |
format |
Article in Journal/Newspaper |
author |
Riedel, Michael Dallimore, Scott Wamsteeker, Michael Taylor, Gary King, Edward L. Rohr, Kristin M. M. Hong, Jong Kuk Jin, Young Keun |
spellingShingle |
Riedel, Michael Dallimore, Scott Wamsteeker, Michael Taylor, Gary King, Edward L. Rohr, Kristin M. M. Hong, Jong Kuk Jin, Young Keun Mega‐scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations |
author_facet |
Riedel, Michael Dallimore, Scott Wamsteeker, Michael Taylor, Gary King, Edward L. Rohr, Kristin M. M. Hong, Jong Kuk Jin, Young Keun |
author_sort |
Riedel, Michael |
title |
Mega‐scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations |
title_short |
Mega‐scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations |
title_full |
Mega‐scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations |
title_fullStr |
Mega‐scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations |
title_full_unstemmed |
Mega‐scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations |
title_sort |
mega‐scale glacial lineations formed by ice shelf grounding in the canadian beaufort sea during multiple glaciations |
publisher |
Wiley |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/52501/ https://oceanrep.geomar.de/id/eprint/52501/7/esp5125-sup-0001-data_s1.docx https://oceanrep.geomar.de/id/eprint/52501/9/esp.5125.pdf https://doi.org/10.1002/esp.5125 |
long_lat |
ENVELOPE(-165.000,-165.000,78.000,78.000) |
geographic |
Arctic Arctic Ocean Chukchi Rise |
geographic_facet |
Arctic Arctic Ocean Chukchi Rise |
genre |
Amundsen Gulf Arctic Arctic Ocean Beaufort Sea Chukchi Ice Shelf Ice Shelves Lomonosov Ridge Alaska |
genre_facet |
Amundsen Gulf Arctic Arctic Ocean Beaufort Sea Chukchi Ice Shelf Ice Shelves Lomonosov Ridge Alaska |
op_relation |
https://oceanrep.geomar.de/id/eprint/52501/7/esp5125-sup-0001-data_s1.docx https://oceanrep.geomar.de/id/eprint/52501/9/esp.5125.pdf Riedel, M. , Dallimore, S., Wamsteeker, M., Taylor, G., King, E. L., Rohr, K. M. M., Hong, J. K. and Jin, Y. K. (2021) Mega‐scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations. Open Access Earth Surface Processes and Landforms, 46 (8). pp. 1568-1585. DOI 10.1002/esp.5125 <https://doi.org/10.1002/esp.5125>. doi:10.1002/esp.5125 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/esp.5125 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
46 |
container_issue |
8 |
container_start_page |
1568 |
op_container_end_page |
1585 |
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1790594767752527872 |