Late Pleistocene paleoceanographic changes of the West equatorial Pacific SCOPUS KCI

Title
Late Pleistocene paleoceanographic changes of the West equatorial Pacific
Author(s)
Yoo, C.M.; Hyeong, K.; Moon, J.-W.; Kim, K.-H.; Chi, S.-B.
KIOST Author(s)
Yoo, Chan Min(유찬민)Hyeong, Kiseong(형기성)Moon, Jai Woon(문재운)Chi, Sang Bum(지상범)
Publication Year
2004
Abstract
To delineate Late Pleistocene paleoceanographic change of the West Pacific, we analyzed the oxygen and carbon isotopic ratios of two planktonic foraminifera species (G. sacculifer and N. dutertrei) from a piston core (KODOS-313) taken from the West equatorial Pacific, and they are compared with the published results of the East Pacific (ODP site 847 and RC 11-210), in terms of relative amounts and mass accumulation rates of CaCO3 and eolian component, back to marine isotopic stage (MIS) 6. Differences in oxygen and carbon isotope values between two foraminifera species (0.75‰ in δ18O, 0.05‰ in δ13C) are less than those of the East Pacific (1.30‰ in δ18O, 0.14‰ in δ13C), which indicates smaller vertical contrasts in both temperature and nutrient between mixing-zone and thermocline in the West Pacific. Strong deviation in δ18O of G. sacculifer from SPlECMAP suggests the carbonate fraction of KODOS-313 was subjected to partial dissolution by bottom water under lysocline. Lower accumulation rates of CaCO3 and eolian component during glacial times are likely due to low sedimentation rate (ave. 0.75 cm/1000 yr) combined with carbonate dissolution in KODOS-313 site. However, the high CaCO3 contents during the glacial periods clearly follow the general pattern of equatorial Pacific ocean.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5349
DOI
10.4217/OPR.2004.26.2.175
Bibliographic Citation
Ocean and Polar Research, v.26, no.2, pp.175 - 185, 2004
Publisher
Korea Ocean Research and Development Institute
Subject
eolian deposit; foraminifera; isotopic ratio; paleoceanography; Pleistocene; sediment core; sedimentation rate; Pacific Ocean; Pacific Ocean (Equatorial); Foraminifera
Keywords
Eolian component; Foraminifera; Paleoceonology; Pleistocene; West Pacific
Type
Article
Language
Korean
Document Type
Article
Publisher
Korea Ocean Research and Development Institute
Related Researcher
Research Interests

deep sea mineral resources,deep sea sediments,심해저 광물자원,심해저 퇴적물,심해 환경

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