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Late Quaternary glacial-interglacial variations in sediment supply in the southern Drake Passage

Cited 3 time in scopus
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Title
Late Quaternary glacial-interglacial variations in sediment supply in the southern Drake Passage
Authors
Lee, Jae Il
Donghyun Kim
Yoo, Kyu-Cheul
Takuya Itaki
Bak, Young-Suk
Yong Il Lee
Lim, Hyoun Soo
Yoon, Ho Il
Subject
Physical Geography; Geology
Keywords
Antarctica; Drake Passage; Provenance; Quaternary; sediment
Issue Date
2012
Publisher
Elsevier
Citation
Lee, Jae Il, et al. 2012. "Late Quaternary glacial-interglacial variations in sediment supply in the southern Drake Passage". QUATERNARY RESEARCH, 78(1): 119-129.
Abstract
Geochemical characteristics of marine sediment from the southern Drake Passage were analyzed to reconstruct variations in sediment provenance and transport paths during the late Quaternary. The 5.95 m gravity core used in this study records paleoenvironmental changes during the last approximately 600 ka. Down-core variations in trace element, rare earth element, and Nd and Sr isotopic compositions reveal that sediment provenance varied according to glacial cycles. During glacial periods, detrital sediments in the southern Drake Passage were mostly derived from the nearby South Shetland Islands and shelf sediments. In contrast, interglacial sediments are composed of mixed sediments, derived from both West Antarctica and East Antarctica. The East Antarctic provenance of the interglacial sediments was inferred to be the Weddell Sea region. Sediment input from the Weddell Sea was reduced during glacial periods by extensive ice sheets and weakened current from the Weddell Sea. Sediment supply from the Weddell Sea increased during interglacial periods, especially those with higher warmth such as MIS 5, 9, and 11. This suggests that the influence of deep water from the Weddell Sea increases during interglacial periods and decreases during glacial periods, with the degree of influence increasing as interglacial intensity increases.
URI
http://repository.kopri.re.kr/handle/201206/6028
DOI
http://dx.doi.org/10.1016/j.yqres.2012.03.010
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