Late Pleistocene paleoceanographic changes of the west Equatorial Pacific

Author(s): Yoo, Chan Min; Hyeong, Kiseong; Moon, Jai-Woon; Kim, Ki-Hyune; Chi, Sang-Bum
Author Affiliation(s): Primary:
KORDI, Marine Geoenvironment and Resources Research Division, Seoul, South Korea
Volume Title: Deep-sea researches in the Pacific Ocean relating to deep-sea resources development
Volume Author(s): Kim, Woong-Seo, editor; Kim, Ki-Hyune
Source: Deep-sea researches in the Pacific Ocean relating to deep-sea resources development, edited by Woong-Seo Kim and Ki-Hyune Kim. Ocean and Polar Research, 26(2), p.175-185. Publisher: Korea Ocean Research and Development Institute, Seoul, South Korea. ISSN: 1598-141X
Note: In Korean with English summary. 31 refs.; illus., incl. 2 tables, sketch map
Summary: 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 per mil in δ18O, 0.05 per mil in δ13C) are less than those of the East Pacific (1.30 per mil in δ18O, 0.14 per mil 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 SPECMAP 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.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 24 Surficial Geology, Quaternary Geology; C-13/C-12; Carbon; Cenozoic; Correlation; Equatorial Pacific; Foraminifera; Geochemical indicators; Geochemistry; Globigerinacea; Globigerinidae; Globigerinoides; Globigerinoides sacculifer; Invertebrata; Isotope ratios; Isotopes; Leg 138; Marine sedimentation; Marine sediments; Microfossils; Neogloboquadrina; Neogloboquadrina dutertrei; O-18/O-16; ODP Site 847; Ocean Drilling Program; Oxygen; Pacific Ocean; Paleo-oceanography; Planktonic taxa; Pleistocene; Protista; Quaternary; Rotaliina; Sedimentation; Sediments; Stable isotopes; Upper Pleistocene
Coordinates: N001134 N001136 W0951911 W0951914
Record ID: 2005024881
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