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Timing of the local last glacial maximum in Terra Nova Bay, Antarctica defined by cosmogenic dating

Cited 2 time in wos
Cited 2 time in scopus
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Title
Timing of the local last glacial maximum in Terra Nova Bay, Antarctica defined by cosmogenic dating
Other Titles
우주기원 동위원소 연대측정을 통한 남극 테라노바 만의 마지막 최대 빙하기의 시기 설정
Authors
Rhee, Hyun Hee
Lee, Min Kyung
Seong, Yeong Bae
Hong, Seongchan
Lee, Jae Il
Yoo, Kyu-Cheul
Yu, Byung Yong
Subject
Physical Geography; Geology
Issue Date
2019-10
Citation
Rhee, Hyun Hee, et al. 2019. "Timing of the local last glacial maximum in Terra Nova Bay, Antarctica defined by cosmogenic dating". QUATERNARY SCIENCE REVIEWS, 221(1): 105897-105902.
Abstract
The Jangbogo Hills are erratic-covered landforms consisting of a series of benches that are parallel to the length of Campbell Glacier, northern Victoria Land, Antarctica. We sampled 41 erratic cobbles from six benches to reveal the exposure times of glacier erratics using in situ 10Be and 26Al. The erratics from the upper three benches yield exposure ages older than Marine Isotope Stage (MIS) 4, with most exposed since MIS 5. However, the lower three benches exhibit tight clusters of exposure ages that range from MIS 3 to the Holocene. Campbell Glacier underwent rapid downwasting during MIS 5, centered at 98.3 ka from its maximum position at the penultimate glacial maximum (PGM). This downwasting continued throughout the last glacial period, with a potential minor stagnation around a bench (~90m asl) between 35.4 and 17.0 ka. Our cosmogenic nuclides surface exposure dating results highlight three important points concerning the glacial history of Terra Nova Bay since the penultimate glacial maximum (PGM) in northern Victoria Land, Antarctica: 1) Campbell Glacier was thicker at the PGM than at the global last glacial maximum (LGM); 2) the local LGM occurred during MIS 4; and 3) the extent of Campbell Glacier during the global LGM (90 m) was much smaller than previously assumed (300e400 m). Hence, the previous view that the local LGM (MIS 4) in Victoria Land, Antarctica was synchronous with the global LGM (MIS 2) should be treated with caution.
URI
https://repository.kopri.re.kr/handle/201206/10975
DOI
http://dx.doi.org/10.1016/j.quascirev.2019.105897
Appears in Collections  
2019-2019, Reconstruction of Antarctic ice sheet and ocean history for the past two million years using sediment records (19-19) / Lee, Jae Il (PE19030)
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