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Core-based reconstruction of paleoenvironmental conditions in the southern Drake Passage (West Antarctica) over the last 150 ka

Cited 2 time in scopus
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Title
Core-based reconstruction of paleoenvironmental conditions in the southern Drake Passage (West Antarctica) over the last 150 ka
Other Titles
지난 15만년 동안의 남부 드레이크 해협의 고환경 복원
Authors
Yoon, Ho Il
Bak, Young-Suk
Lee, Jae Il
Lee, Yong Il
Yoo, Kyu-Cheul
Subject
Geology; Oceanography
Keywords
Antarctica; Drake Passage; Quaternary; sediment core; sedimentary processes
Issue Date
2009
Publisher
Springer
Citation
Yoon, Ho Il, et al. 2009. "Core-based reconstruction of paleoenvironmental conditions in the southern Drake Passage (West Antarctica) over the last 150 ka". GEO-MARINE LETTERS, 29(5): 309-320.
Abstract
A deep-sea sediment core (GC98-06) from the southernmost Drake Passage, West Antarctica, shows late Quaternary depositional environments distinctly different from sedimentary drifts commonly found along the southwestern Pacific margin of the Drake Passage. The chronology of the core has been inferred using geochemical tracers of paleoproductivity and diatom biostratigraphy, and represents the paleoceanographic conditions in a continental rise setting during the last 150,000 years. Three dominant sediment types associated with distinct sedimentary processes have been identified using textural/compositional analyses: (1) hemipelagic mud (interglacial sediments) deposited from pelagic settling of bioclasts, meltwater plumes, and ice-rafted detritus;(2) terrigenous mud (glacial sediments) delivered by turbid meltwater plumes;and (3) massive muds marking the boundaries from interglacial to glacial periods. The succession of the sedimentary facies in core GC98-06 is interpreted to reflect temporal changes in environmental conditions prevailing on the continental rise of the southern Drake Passage in the course of successive climatic stages over the last 150 ka: from the bottom upward, these are glacial, interglacial, glaciation, glacial, and interglacial episodes. Variability in sediment flux and diatom abundance seem to have been related to changes in glacial advance, sea-ice extent, and specific sedimentary environments, collectively influenced by mid- to late Quaternary climatic changes.
URI
http://repository.kopri.re.kr/handle/201206/6069
DOI
http://dx.doi.org/10.1007/s00367-009-0144-8
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