Biogenic CaCO3 and Opal Depositions and Their Latitudinal Comparison During the Past 600 ka in the Central Equatorial Pacific SCIE SCOPUS

Cited 2 time in WEB OF SCIENCE Cited 2 time in Scopus
Title
Biogenic CaCO3 and Opal Depositions and Their Latitudinal Comparison During the Past 600 ka in the Central Equatorial Pacific
Author(s)
Khim, Boo-Keun; Yoo, Chan Min; Kim, Hyung Jeek; Hyeong, Kiseong; Takata, Hiroyuki; Kim, Sunghan; Chi, Sang Bum; Ko, Young Tak
KIOST Author(s)
Yoo, Chan Min(유찬민)Kim, Hyung Jeek(김형직)Hyeong, Kiseong(형기성)Chi, Sang Bum(지상범)Ko, Youngtak(고영탁)
Publication Year
2015-08
Abstract
The orbital-scale variations in biogenic CaCO3 and opal abundance in two piston cores collected in the central equatorial Pacific (core PC5101 from a southern site at 2 degrees N, and core PC5103 from a northern site at 6 degrees N) were compared to assess latitudinal differences. The correlation between the oxygen isotope stratigiaphy of planktonic foraminifera (Globigerinoides sacculifer) of PC5103 with the LR04 stacks provides the age of PC5103 to be approximately 950 ka. The age of PC5103 was further refined by correlating the CaCO3 content with the well-dated core RC11-210. The age of PC5101 was also constrained by the same CaCO3 chronostratigraphic correlation with RC11-210, resulting in an age of approximately 650 ka. Distinct orbital-scale series of CaCO3 and opal variations appear to be parallel between the two cores during the past 600 ka, which are controlled mainly by eccentricity with an approximate periodicity of 100 ka. It is worth noting that the biogenic CaCO3 and opal deposition patterns in the two cores differ between interglacial and glacial periods. During interglacial periods the biogenic opal content is higher in the southern core than in the northern core, which corresponds with the present-day condition. In contrast the CaCO3 content is higher in the northern core, which is contradictory to the present-day northward decreasing CaCO3 deposition pattern from the Equator. The collection site of PC5101 is approximately 350 m deeper than that of PC5103, which significantly promotes CaCO3 dissolution and causes unexpectedly high CaCO3 content at the northern site in contrast to the biogenic opal content.
ISSN
1017-0839
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2438
DOI
10.3319/TAO.2015.02.09.01(Oc)
Bibliographic Citation
TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES, v.26, no.4, pp.441 - 450, 2015
Publisher
CHINESE GEOSCIENCE UNION
Subject
LATE PLEISTOCENE PALEOCLIMATOLOGY; EASTERN TROPICAL PACIFIC; PLANKTONIC-FORAMINIFERA; DISSOLUTION FLUCTUATIONS; CARBONATE DISSOLUTION; PRESERVATION; RECORD; OCEAN; ACCUMULATION; VARIABILITY
Keywords
CaCO3; Opal; Glacial-interglacial; ITCZ; Equatorial Pacific; Late Quaternary
Type
Article
Language
English
Document Type
Article
Publisher
CHINESE GEOSCIENCE UNION
Related Researcher
Research Interests

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

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