Fish proliferation and rare-earth deposition by topographically induced upwelling at the late Eocene cooling event
The deep-sea clay that covers wide areas of the pelagic ocean bottom provides key information about open-ocean environments but lacks age-diagnostic calcareous or siliceous microfossils. The marine osmium isotope record has varied in response to environmental changes and can therefore be a useful st...
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ftpubmed:oai:pubmedcentral.nih.gov:7303186 2023-05-15T13:39:35+02:00 Fish proliferation and rare-earth deposition by topographically induced upwelling at the late Eocene cooling event Ohta, Junichiro Yasukawa, Kazutaka Nozaki, Tatsuo Takaya, Yutaro Mimura, Kazuhide Fujinaga, Koichiro Nakamura, Kentaro Usui, Yoichi Kimura, Jun-Ichi Chang, Qing Kato, Yasuhiro 2020-06-18 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7303186/ http://www.ncbi.nlm.nih.gov/pubmed/32555233 https://doi.org/10.1038/s41598-020-66835-8 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7303186/ http://www.ncbi.nlm.nih.gov/pubmed/32555233 http://dx.doi.org/10.1038/s41598-020-66835-8 © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Sci Rep Article Text 2020 ftpubmed https://doi.org/10.1038/s41598-020-66835-8 2020-06-28T00:24:34Z The deep-sea clay that covers wide areas of the pelagic ocean bottom provides key information about open-ocean environments but lacks age-diagnostic calcareous or siliceous microfossils. The marine osmium isotope record has varied in response to environmental changes and can therefore be a useful stratigraphic marker. In this study, we used osmium isotope ratios to determine the depositional ages of pelagic clays extraordinarily rich in fish debris. Much fish debris was deposited in the western North and central South Pacific sites roughly 34.4 million years ago, concurrent with a late Eocene event, a temporal expansion of Antarctic ice preceding the Eocene–Oligocene climate transition. The enhanced northward flow of bottom water formed around Antarctica probably caused upwelling of deep-ocean nutrients at topographic highs and stimulated biological productivity that resulted in the proliferation of fish in pelagic realms. The abundant fish debris is now a highly concentrated source of industrially critical rare-earth elements. Text Antarc* Antarctic Antarctica PubMed Central (PMC) Antarctic Pacific Scientific Reports 10 1 |
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Article Ohta, Junichiro Yasukawa, Kazutaka Nozaki, Tatsuo Takaya, Yutaro Mimura, Kazuhide Fujinaga, Koichiro Nakamura, Kentaro Usui, Yoichi Kimura, Jun-Ichi Chang, Qing Kato, Yasuhiro Fish proliferation and rare-earth deposition by topographically induced upwelling at the late Eocene cooling event |
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Article |
description |
The deep-sea clay that covers wide areas of the pelagic ocean bottom provides key information about open-ocean environments but lacks age-diagnostic calcareous or siliceous microfossils. The marine osmium isotope record has varied in response to environmental changes and can therefore be a useful stratigraphic marker. In this study, we used osmium isotope ratios to determine the depositional ages of pelagic clays extraordinarily rich in fish debris. Much fish debris was deposited in the western North and central South Pacific sites roughly 34.4 million years ago, concurrent with a late Eocene event, a temporal expansion of Antarctic ice preceding the Eocene–Oligocene climate transition. The enhanced northward flow of bottom water formed around Antarctica probably caused upwelling of deep-ocean nutrients at topographic highs and stimulated biological productivity that resulted in the proliferation of fish in pelagic realms. The abundant fish debris is now a highly concentrated source of industrially critical rare-earth elements. |
format |
Text |
author |
Ohta, Junichiro Yasukawa, Kazutaka Nozaki, Tatsuo Takaya, Yutaro Mimura, Kazuhide Fujinaga, Koichiro Nakamura, Kentaro Usui, Yoichi Kimura, Jun-Ichi Chang, Qing Kato, Yasuhiro |
author_facet |
Ohta, Junichiro Yasukawa, Kazutaka Nozaki, Tatsuo Takaya, Yutaro Mimura, Kazuhide Fujinaga, Koichiro Nakamura, Kentaro Usui, Yoichi Kimura, Jun-Ichi Chang, Qing Kato, Yasuhiro |
author_sort |
Ohta, Junichiro |
title |
Fish proliferation and rare-earth deposition by topographically induced upwelling at the late Eocene cooling event |
title_short |
Fish proliferation and rare-earth deposition by topographically induced upwelling at the late Eocene cooling event |
title_full |
Fish proliferation and rare-earth deposition by topographically induced upwelling at the late Eocene cooling event |
title_fullStr |
Fish proliferation and rare-earth deposition by topographically induced upwelling at the late Eocene cooling event |
title_full_unstemmed |
Fish proliferation and rare-earth deposition by topographically induced upwelling at the late Eocene cooling event |
title_sort |
fish proliferation and rare-earth deposition by topographically induced upwelling at the late eocene cooling event |
publisher |
Nature Publishing Group UK |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7303186/ http://www.ncbi.nlm.nih.gov/pubmed/32555233 https://doi.org/10.1038/s41598-020-66835-8 |
geographic |
Antarctic Pacific |
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Antarctic Pacific |
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Antarc* Antarctic Antarctica |
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Antarc* Antarctic Antarctica |
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Sci Rep |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7303186/ http://www.ncbi.nlm.nih.gov/pubmed/32555233 http://dx.doi.org/10.1038/s41598-020-66835-8 |
op_rights |
© The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
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CC-BY |
op_doi |
https://doi.org/10.1038/s41598-020-66835-8 |
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Scientific Reports |
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10 |
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1 |
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