Stratigraphic and Paleoclimatic Analysis of Late Pleistocene Tropical Southeast Pacific Cores (with an Appendix by N. J. Shackleton)
Abstract Factor analysis of dissolution-resistant species of planktonic foraminifera in the >250 μm fraction of seabed and core samples from the tropical southeast Pacific yields five mappable varimax assemblages. The distribution of these assemblages in core tops is more related to the subsurfac...
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Cambridge University Press (CUP)
1973
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crcambridgeupr:10.1016/0033-5894(73)90053-7 2024-06-09T07:49:07+00:00 Stratigraphic and Paleoclimatic Analysis of Late Pleistocene Tropical Southeast Pacific Cores (with an Appendix by N. J. Shackleton) Luz, Boaz 1973 http://dx.doi.org/10.1016/0033-5894(73)90053-7 http://api.elsevier.com/content/article/PII:0033589473900537?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589473900537?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400035778 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 3, issue 1, page 56-72 ISSN 0033-5894 1096-0287 journal-article 1973 crcambridgeupr https://doi.org/10.1016/0033-5894(73)90053-7 2024-05-15T13:05:53Z Abstract Factor analysis of dissolution-resistant species of planktonic foraminifera in the >250 μm fraction of seabed and core samples from the tropical southeast Pacific yields five mappable varimax assemblages. The distribution of these assemblages in core tops is more related to the subsurface thermal structure than to the surface temperature. A transfer function relating the assemblages in core tops to the temperature at 200 m is applied to five cores. Cycles of estimated temperature in three cores are approximately in phase with climatic cycles in Atlantic cores spanning the past 200,000 yr, and display amplitudes on the order of 5°C. Two zones of increased calcium carbonate dissolution occur in these three cores. These zones occur in the transition from interglacial to glacial intervals. Temperature variations inferred are ascribed to fluctuations of the main thermocline, and the inference is made that during cold intervals the thermocline was displaced upward as the central water mass was areally diminished. A model of circulation dynamics suggests that such areal diminution would be associated with an intensified circulation. No significant fluctuations in the estimated 200 m temperature are inferred for a core in the Galápagos area during the last glacial, but a pronounced peak of high-latitude species Globorotalia inflata does occur. This peak is judged to reflect the removal of a low-oxygen ecological barrier. Article in Journal/Newspaper Planktonic foraminifera Cambridge University Press Pacific Shackleton Quaternary Research 3 1 56 72 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Factor analysis of dissolution-resistant species of planktonic foraminifera in the >250 μm fraction of seabed and core samples from the tropical southeast Pacific yields five mappable varimax assemblages. The distribution of these assemblages in core tops is more related to the subsurface thermal structure than to the surface temperature. A transfer function relating the assemblages in core tops to the temperature at 200 m is applied to five cores. Cycles of estimated temperature in three cores are approximately in phase with climatic cycles in Atlantic cores spanning the past 200,000 yr, and display amplitudes on the order of 5°C. Two zones of increased calcium carbonate dissolution occur in these three cores. These zones occur in the transition from interglacial to glacial intervals. Temperature variations inferred are ascribed to fluctuations of the main thermocline, and the inference is made that during cold intervals the thermocline was displaced upward as the central water mass was areally diminished. A model of circulation dynamics suggests that such areal diminution would be associated with an intensified circulation. No significant fluctuations in the estimated 200 m temperature are inferred for a core in the Galápagos area during the last glacial, but a pronounced peak of high-latitude species Globorotalia inflata does occur. This peak is judged to reflect the removal of a low-oxygen ecological barrier. |
format |
Article in Journal/Newspaper |
author |
Luz, Boaz |
spellingShingle |
Luz, Boaz Stratigraphic and Paleoclimatic Analysis of Late Pleistocene Tropical Southeast Pacific Cores (with an Appendix by N. J. Shackleton) |
author_facet |
Luz, Boaz |
author_sort |
Luz, Boaz |
title |
Stratigraphic and Paleoclimatic Analysis of Late Pleistocene Tropical Southeast Pacific Cores (with an Appendix by N. J. Shackleton) |
title_short |
Stratigraphic and Paleoclimatic Analysis of Late Pleistocene Tropical Southeast Pacific Cores (with an Appendix by N. J. Shackleton) |
title_full |
Stratigraphic and Paleoclimatic Analysis of Late Pleistocene Tropical Southeast Pacific Cores (with an Appendix by N. J. Shackleton) |
title_fullStr |
Stratigraphic and Paleoclimatic Analysis of Late Pleistocene Tropical Southeast Pacific Cores (with an Appendix by N. J. Shackleton) |
title_full_unstemmed |
Stratigraphic and Paleoclimatic Analysis of Late Pleistocene Tropical Southeast Pacific Cores (with an Appendix by N. J. Shackleton) |
title_sort |
stratigraphic and paleoclimatic analysis of late pleistocene tropical southeast pacific cores (with an appendix by n. j. shackleton) |
publisher |
Cambridge University Press (CUP) |
publishDate |
1973 |
url |
http://dx.doi.org/10.1016/0033-5894(73)90053-7 http://api.elsevier.com/content/article/PII:0033589473900537?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589473900537?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400035778 |
geographic |
Pacific Shackleton |
geographic_facet |
Pacific Shackleton |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Quaternary Research volume 3, issue 1, page 56-72 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(73)90053-7 |
container_title |
Quaternary Research |
container_volume |
3 |
container_issue |
1 |
container_start_page |
56 |
op_container_end_page |
72 |
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1801381326708801536 |