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Mega-scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations

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Title
Mega-scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations
Other Titles
여러 번의 빙하기 동안 캐나다 보퍼트해에서의 빙붕 그라운딩 작용에 의해 형성된 대규모 빙하선구조
Authors
Riedel, Michael
Dallimore, Scott
Wamsteeker, Michael
Taylor, Gary
King, Edward L.
Rohr, Kristin M. M.
Hong, Jong Kuk
Jin, Young Keun
Subject
Physical GeographyGeology
Keywords
3D seismic dataCanadian Beaufort SeaLate Glacial Maximumice shelf groundingmega-scale glacial lineations
Issue Date
2021-06-30
Citation
Riedel, Michael, et al. 2021. "Mega-scale glacial lineations formed by ice shelf grounding in the Canadian Beaufort Sea during multiple glaciations". EARTH SURFACE PROCESSES AND LANDFORMS, 46(8): 1568-1585.
Abstract
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 to 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 degrees-44 degrees). 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 degrees-48 degrees, and lineations closer to the continental shelf break at 55 degrees-59 degrees. The third lineated surface is an unconformable horizon buried up to 390 m below seafloor with lineaments oriented between 30 degrees and 55 degrees. 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.
URI
https://repository.kopri.re.kr/handle/201206/13569
DOI
http://dx.doi.org/10.1002/esp.5125
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)
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