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Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean

Cited 1 time in wos
Cited 1 time in scopus
Title
Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean
Other Titles
북극해 척치대륙주변부 북서부에서의 빙하발달사를 지시하는 탄성파층서-지형학적 증거
Authors
Kim, Sookwan
Polyak, Leonid
Joe, Young Jin
Niessen, Frank
Kim, Hyoung Jun
Choi, Yeonjin
Kang, Seung-Goo
Hong, Jong Kuk
Nam, Seung-il
Jin, Young Keun
Subject
Geology
Keywords
Arctic OceanChukchi Riseglaciogenic sedimentary processesice­sheet dynamicsmorphobathymetryseismostratigraphy
Issue Date
2021-04
Citation
Kim, Sookwan, et al. 2021. "Seismostratigraphic and Geomorphic Evidence for the Glacial History of the Northwestern Chukchi Margin, Arctic Ocean". JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 126(4): 1-29.
Abstract
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 sub-bottom 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?1 Ma. 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.
URI
https://repository.kopri.re.kr/handle/201206/13065
DOI
http://dx.doi.org/10.1029/2020JF006030
Type
Article
Station
Araon
Indexed
SCIE
Appears in Collections  
2020-2020, Investigation of submarine resource environment and seabed methane release in the Arctic (20-20) / Jin, Young Keun (PM20050)
2020-2020, Based Research on International Joint Drilling for Reconstructing Evolution and Glacial History of the Arctic Ocean (20-20) / Nam, Seung-il (PE20350)
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