Orbital Variations of Biogenic CaCO3 and Opal Abundance in the Western and Central Equatorial Pacific Ocean During the Late Quaternary
Biogenic CaCO3 and opal abundances were measured in two piston cores (PC313 and PC5101) collected, respectively, along the equator in the western and central Pacific Ocean. The age model for core PC313, which extends to about 750 ka, was developed by comparing the oxygen isotope stratigraphy of plan...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer
2012
|
Subjects: | |
Online Access: | https://doaj.org/article/b6c5f089d08c4bcf801efffd57541f73 |
id |
ftdoajarticles:oai:doaj.org/article:b6c5f089d08c4bcf801efffd57541f73 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:b6c5f089d08c4bcf801efffd57541f73 2023-05-15T18:01:03+02:00 Orbital Variations of Biogenic CaCO3 and Opal Abundance in the Western and Central Equatorial Pacific Ocean During the Late Quaternary Boo-Keun Khim Hyung Jeek Kim Young Seuk Cho Sang Bum Chi Chan Min Yoo 2012-01-01T00:00:00Z https://doaj.org/article/b6c5f089d08c4bcf801efffd57541f73 EN eng Springer http://tao.cgu.org.tw/images/attachments/v231p107.pdf https://doaj.org/toc/1017-0839 https://doaj.org/toc/2311-7680 1017-0839 2311-7680 10.3319/TAO.2011.07.05.01(Oc) https://doaj.org/article/b6c5f089d08c4bcf801efffd57541f73 Terrestrial, Atmospheric and Oceanic Sciences, Vol 23, Iss 1, p 107 (2012) CaCO3 Opal Glacial-interglacial Mid-Bruhnes event Equatorial Pacific Late Quaternary Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 article 2012 ftdoajarticles 2022-12-30T22:23:26Z Biogenic CaCO3 and opal abundances were measured in two piston cores (PC313 and PC5101) collected, respectively, along the equator in the western and central Pacific Ocean. The age model for core PC313, which extends to about 750 ka, was developed by comparing the oxygen isotope stratigraphy of planktonic foraminifera (N. dutetrei) to the SPECMAP stack. The age model for core PC5101, which extends to about 600 ka, was developed by stratigraphic correlation of CaCO3 contents to those in the well-dated core RC11-210 (Chuey et al. 1987). Both cores distinctly exhibited a series of CaCO3 and opal variations, which are mainly controlled by the orbital eccentricity cycle of about 100-kyr. The orbital-scale cyclic variations of CaCO3 and opal contents appear to be contrasting in both cores such that high CaCO3 and low opal contents occurred during the glacial periods. In contrast, during the interglacial periods, low CaCO3 and high opal contents occurred. Mostly remarkable is the distinct occurrence of a mid-Bruhnes event (MBE) at around 350 ka. The CaCO3 content was higher in core PC5101 than in core PC313 before the MBE, whereas biogenic opal abundance became higher in core PC5101 after the MBE. Such a characteristic discrepancy of biogenic (CaCO3 and opal) production, i.e., a succession of primary producers from coccolithophore to diatom, between cores PC313 and PC5101 may be attributed to the prevailing dominant hydrographic conditions (i.e., the South Equatorial Current), in the path of which both cores are located. The intensity of westward propagation might have been an important factor in contrasting biogenic production centering around the MBE. Article in Journal/Newspaper Planktonic foraminifera Directory of Open Access Journals: DOAJ Articles Pacific |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
CaCO3 Opal Glacial-interglacial Mid-Bruhnes event Equatorial Pacific Late Quaternary Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
CaCO3 Opal Glacial-interglacial Mid-Bruhnes event Equatorial Pacific Late Quaternary Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 Boo-Keun Khim Hyung Jeek Kim Young Seuk Cho Sang Bum Chi Chan Min Yoo Orbital Variations of Biogenic CaCO3 and Opal Abundance in the Western and Central Equatorial Pacific Ocean During the Late Quaternary |
topic_facet |
CaCO3 Opal Glacial-interglacial Mid-Bruhnes event Equatorial Pacific Late Quaternary Geology QE1-996.5 Geophysics. Cosmic physics QC801-809 |
description |
Biogenic CaCO3 and opal abundances were measured in two piston cores (PC313 and PC5101) collected, respectively, along the equator in the western and central Pacific Ocean. The age model for core PC313, which extends to about 750 ka, was developed by comparing the oxygen isotope stratigraphy of planktonic foraminifera (N. dutetrei) to the SPECMAP stack. The age model for core PC5101, which extends to about 600 ka, was developed by stratigraphic correlation of CaCO3 contents to those in the well-dated core RC11-210 (Chuey et al. 1987). Both cores distinctly exhibited a series of CaCO3 and opal variations, which are mainly controlled by the orbital eccentricity cycle of about 100-kyr. The orbital-scale cyclic variations of CaCO3 and opal contents appear to be contrasting in both cores such that high CaCO3 and low opal contents occurred during the glacial periods. In contrast, during the interglacial periods, low CaCO3 and high opal contents occurred. Mostly remarkable is the distinct occurrence of a mid-Bruhnes event (MBE) at around 350 ka. The CaCO3 content was higher in core PC5101 than in core PC313 before the MBE, whereas biogenic opal abundance became higher in core PC5101 after the MBE. Such a characteristic discrepancy of biogenic (CaCO3 and opal) production, i.e., a succession of primary producers from coccolithophore to diatom, between cores PC313 and PC5101 may be attributed to the prevailing dominant hydrographic conditions (i.e., the South Equatorial Current), in the path of which both cores are located. The intensity of westward propagation might have been an important factor in contrasting biogenic production centering around the MBE. |
format |
Article in Journal/Newspaper |
author |
Boo-Keun Khim Hyung Jeek Kim Young Seuk Cho Sang Bum Chi Chan Min Yoo |
author_facet |
Boo-Keun Khim Hyung Jeek Kim Young Seuk Cho Sang Bum Chi Chan Min Yoo |
author_sort |
Boo-Keun Khim |
title |
Orbital Variations of Biogenic CaCO3 and Opal Abundance in the Western and Central Equatorial Pacific Ocean During the Late Quaternary |
title_short |
Orbital Variations of Biogenic CaCO3 and Opal Abundance in the Western and Central Equatorial Pacific Ocean During the Late Quaternary |
title_full |
Orbital Variations of Biogenic CaCO3 and Opal Abundance in the Western and Central Equatorial Pacific Ocean During the Late Quaternary |
title_fullStr |
Orbital Variations of Biogenic CaCO3 and Opal Abundance in the Western and Central Equatorial Pacific Ocean During the Late Quaternary |
title_full_unstemmed |
Orbital Variations of Biogenic CaCO3 and Opal Abundance in the Western and Central Equatorial Pacific Ocean During the Late Quaternary |
title_sort |
orbital variations of biogenic caco3 and opal abundance in the western and central equatorial pacific ocean during the late quaternary |
publisher |
Springer |
publishDate |
2012 |
url |
https://doaj.org/article/b6c5f089d08c4bcf801efffd57541f73 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Terrestrial, Atmospheric and Oceanic Sciences, Vol 23, Iss 1, p 107 (2012) |
op_relation |
http://tao.cgu.org.tw/images/attachments/v231p107.pdf https://doaj.org/toc/1017-0839 https://doaj.org/toc/2311-7680 1017-0839 2311-7680 10.3319/TAO.2011.07.05.01(Oc) https://doaj.org/article/b6c5f089d08c4bcf801efffd57541f73 |
_version_ |
1766170379023286272 |