Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean
High-resolution seafloor mapping provides insights into the dynamics of past ice sheets/ice shelves on high-latitude continental margins. Geological/geophysical studies in the Arctic Ocean suggest widespread Pleistocene ice grounding on the Chukchi–East Siberian continental margin. However, flow dir...
Published in: | Journal of Geophysical Research: Earth Surface |
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Online Access: | https://epic.awi.de/id/eprint/54417/ https://hdl.handle.net/10013/epic.19d7b3ca-ad07-4335-ab18-ac0401e4d5a3 |
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ftawi:oai:epic.awi.de:54417 2024-09-15T17:51:44+00:00 Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean Kim, Sookwan Polyak, Leonid Young, Jin Joe Niessen, Frank Kim, Hyoung Jun Choi, Yeonjin Kang, Seung-Goo Hong, Jong Kuk Nam, Seung-Ill Jin, Young Keun 2021 https://epic.awi.de/id/eprint/54417/ https://hdl.handle.net/10013/epic.19d7b3ca-ad07-4335-ab18-ac0401e4d5a3 unknown AGU Kim, S. orcid:0000-0001-9960-2295 , Polyak, L. orcid:0000-0002-9633-5352 , Young, J. J. , Niessen, F. orcid:0000-0001-6453-0594 , Kim, H. J. , Choi, Y. , Kang, S. G. orcid:0000-0001-6532-3482 , Hong, J. K. orcid:0000-0002-6705-2310 , Nam, S. I. and Jin, Y. K. orcid:0000-0003-3511-0464 (2021) Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean , Journal of Geophysical Research: Earth Surface, 126 , pp. 1-29 . doi:10.1029/2020JF006030 <https://doi.org/10.1029/2020JF006030> , hdl:10013/epic.19d7b3ca-ad07-4335-ab18-ac0401e4d5a3 EPIC3Journal of Geophysical Research: Earth Surface, AGU, 126, pp. 1-29 Article isiRev 2021 ftawi https://doi.org/10.1029/2020JF006030 2024-06-24T04:27:29Z High-resolution seafloor mapping provides insights into the dynamics of past ice sheets/ice shelves on high-latitude continental margins. Geological/geophysical studies in the Arctic Ocean suggest widespread Pleistocene ice grounding on the Chukchi–East Siberian continental margin. However, flow directions, timing, and behavior of these ice masses are not yet clear due to insufficient data. We present a combined seismostratigraphic and morphobathymetric analysis of the Chukchi Rise off the northwestern Chukchi margin using the densely acquired subbottom profiler (SBP) and multibeam echosounder (MBES) data. Comparison with deeper airgun seismic records shows that the SBP data cover most of the glaciogenic stratigraphy possibly spanning ca. 0.5–1Ma. Based on the stratigraphic distribution and geometry of acoustically transparent glaciogenic diamictons, the lateral and vertical extent of southern- sourced grounded ice became smaller over time. The older deposits are abundant as debris lobes on the slope contributing to a large trough mouth fan, whereas younger grounding-zone wedges are found at shallower depths. MBES data show two sets of mega-scale lineations indicating at least two fast ice- streaming events of different ages. Contour-parallel recessional morainic ridges mark a stepwise retreat of the grounded ice margin, likely controlled by rising sea levels during deglaciation(s). The different inferred advance and retreat directions of the southern-sourced ice reflect complex geomorphic settings. The overall picture shows that the Chukchi Rise was an area where different ice streams had complex interactions. In addition to glaciogenic deposits, we identify a number of related or preceding seabed features including mounds, gullies/channels, and sediment waves. Article in Journal/Newspaper Arctic Arctic Ocean Chukchi Ice Shelves Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Journal of Geophysical Research: Earth Surface 126 4 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
High-resolution seafloor mapping provides insights into the dynamics of past ice sheets/ice shelves on high-latitude continental margins. Geological/geophysical studies in the Arctic Ocean suggest widespread Pleistocene ice grounding on the Chukchi–East Siberian continental margin. However, flow directions, timing, and behavior of these ice masses are not yet clear due to insufficient data. We present a combined seismostratigraphic and morphobathymetric analysis of the Chukchi Rise off the northwestern Chukchi margin using the densely acquired subbottom profiler (SBP) and multibeam echosounder (MBES) data. Comparison with deeper airgun seismic records shows that the SBP data cover most of the glaciogenic stratigraphy possibly spanning ca. 0.5–1Ma. Based on the stratigraphic distribution and geometry of acoustically transparent glaciogenic diamictons, the lateral and vertical extent of southern- sourced grounded ice became smaller over time. The older deposits are abundant as debris lobes on the slope contributing to a large trough mouth fan, whereas younger grounding-zone wedges are found at shallower depths. MBES data show two sets of mega-scale lineations indicating at least two fast ice- streaming events of different ages. Contour-parallel recessional morainic ridges mark a stepwise retreat of the grounded ice margin, likely controlled by rising sea levels during deglaciation(s). The different inferred advance and retreat directions of the southern-sourced ice reflect complex geomorphic settings. The overall picture shows that the Chukchi Rise was an area where different ice streams had complex interactions. In addition to glaciogenic deposits, we identify a number of related or preceding seabed features including mounds, gullies/channels, and sediment waves. |
format |
Article in Journal/Newspaper |
author |
Kim, Sookwan Polyak, Leonid Young, Jin Joe Niessen, Frank Kim, Hyoung Jun Choi, Yeonjin Kang, Seung-Goo Hong, Jong Kuk Nam, Seung-Ill Jin, Young Keun |
spellingShingle |
Kim, Sookwan Polyak, Leonid Young, Jin Joe Niessen, Frank Kim, Hyoung Jun Choi, Yeonjin Kang, Seung-Goo Hong, Jong Kuk Nam, Seung-Ill Jin, Young Keun Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean |
author_facet |
Kim, Sookwan Polyak, Leonid Young, Jin Joe Niessen, Frank Kim, Hyoung Jun Choi, Yeonjin Kang, Seung-Goo Hong, Jong Kuk Nam, Seung-Ill Jin, Young Keun |
author_sort |
Kim, Sookwan |
title |
Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean |
title_short |
Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean |
title_full |
Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean |
title_fullStr |
Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean |
title_full_unstemmed |
Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean |
title_sort |
seismostratigraphic and geomorphic evidence for the glacial history of the northwestern chukchi margin, arctic ocean |
publisher |
AGU |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/54417/ https://hdl.handle.net/10013/epic.19d7b3ca-ad07-4335-ab18-ac0401e4d5a3 |
genre |
Arctic Arctic Ocean Chukchi Ice Shelves |
genre_facet |
Arctic Arctic Ocean Chukchi Ice Shelves |
op_source |
EPIC3Journal of Geophysical Research: Earth Surface, AGU, 126, pp. 1-29 |
op_relation |
Kim, S. orcid:0000-0001-9960-2295 , Polyak, L. orcid:0000-0002-9633-5352 , Young, J. J. , Niessen, F. orcid:0000-0001-6453-0594 , Kim, H. J. , Choi, Y. , Kang, S. G. orcid:0000-0001-6532-3482 , Hong, J. K. orcid:0000-0002-6705-2310 , Nam, S. I. and Jin, Y. K. orcid:0000-0003-3511-0464 (2021) Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean , Journal of Geophysical Research: Earth Surface, 126 , pp. 1-29 . doi:10.1029/2020JF006030 <https://doi.org/10.1029/2020JF006030> , hdl:10013/epic.19d7b3ca-ad07-4335-ab18-ac0401e4d5a3 |
op_doi |
https://doi.org/10.1029/2020JF006030 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
126 |
container_issue |
4 |
_version_ |
1810293717926412288 |