Articles | Volume 35, issue 1
https://doi.org/10.1144/jmpaleo2014-026
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.1144/jmpaleo2014-026
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
01 Jan 2016
| 01 Jan 2016
New species of Neogene radiolarians from the Southern Ocean – part IV
Johan Renaudie
Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung an der Humboldt-Universität zu Berlin, Invalidenstraße 43, 10115 Berlin, Germany
David B. Lazarus
Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung an der Humboldt-Universität zu Berlin, Invalidenstraße 43, 10115 Berlin, Germany
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Short summary
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We studied diatom fossils from the Southern Ocean to understand how ocean productivity changed ~40–30 million years ago during a major climate shift marked by the onset of permanent Antarctic glaciation and global cooling. We found striking shifts in diatom productivity, revealing critical changes in ocean circulation and nutrient supply. Our results show how these microscopic organisms may have influenced climate, acting as a geological force that shaped global climate over time.
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This preprint is open for discussion and under review for Biogeosciences (BG).
Short summary
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The compilation of Palaeogene deep-sea diatom-bearing sediment occurrences indicates that the deposition of diatom-bearing sediments is mainly controlled by nutrient availability and ocean circulation in the Atlantic, Pacific and Indian oceans. Comparison with shallow marine diatomites suggests that the peak in the number of diatom-bearing sites in the Atlantic may be related to tectonic reorganizations that caused the cessation of shallow marine diatomite deposition between ~46 and ~44 Ma.
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A global-scale compilation of Palaeogene diatomite occurrences shows how palaeogeographic and palaeoceanographic changes impacted diatom accumulation, especially in the middle Eocene. Diatomite deposition dropped in epicontinental seas between ~ 46 and ~ 44 Ma, while diatom accumulation began around 43.5 Ma in open-ocean settings. The compilation also shows an indirect correlation between Palaeogene climate fluctuations and diatomite deposition in shallow-marine and freshwater environments.
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Johan Renaudie and David B. Lazarus
EGUsphere, https://doi.org/10.5194/egusphere-2023-3087, https://doi.org/10.5194/egusphere-2023-3087, 2024
Short summary
Short summary
We provide a new compilation of rates at which sediments deposited in the deep sea over the last 70 million years. We highlight a bias, linked to the drilling process, that makes it more likely for high rates to be recovered for younger sediments than for older ones. Correcting for this bias, the record show, contrary to previous estimates, a more stable history, thus providing some insights on the past mismatch between physico-chemical model estimates and observations.
Clément Coiffard, Haytham El Atfy, Johan Renaudie, Robert Bussert, and Dieter Uhl
Biogeosciences, 20, 1145–1154, https://doi.org/10.5194/bg-20-1145-2023, https://doi.org/10.5194/bg-20-1145-2023, 2023
Short summary
Short summary
Eighty-million-year-old fossil leaf assemblages suggest a widespread distribution of tropical rainforest in northeastern Africa.
Veronica Carlsson, Taniel Danelian, Pierre Boulet, Philippe Devienne, Aurelien Laforge, and Johan Renaudie
J. Micropalaeontol., 41, 165–182, https://doi.org/10.5194/jm-41-165-2022, https://doi.org/10.5194/jm-41-165-2022, 2022
Short summary
Short summary
This study evaluates the use of automatic classification using AI on eight closely related radiolarian species of the genus Podocyrtis based on MobileNet CNN. Species belonging to Podocyrtis are useful for middle Eocene biostratigraphy. Numerous images of Podocyrtis species from the tropical Atlantic Ocean were used to train and validate the CNN. An overall accuracy of about 91 % was obtained. Additional Podocyrtis specimens from other ocean realms were used to test the predictive model.
Johan Renaudie, Effi-Laura Drews, and Simon Böhne
Foss. Rec., 21, 183–205, https://doi.org/10.5194/fr-21-183-2018, https://doi.org/10.5194/fr-21-183-2018, 2018
Short summary
Short summary
Our ability to reconstruct the marine planktonic diatom early Paleogene history is hampered by decreased preservation as well as by observation bias. Collecting new diatom data in various Paleocene samples from legacy deep-sea sediment sections allows us to correct for the latter. The results show that the Paleocene deep-sea diatoms seem in fact as diverse and abundant as in the later Eocene while exhibiting very substantial survivorship of Cretaceous species up until the Eocene.
Johan Renaudie
Biogeosciences, 13, 6003–6014, https://doi.org/10.5194/bg-13-6003-2016, https://doi.org/10.5194/bg-13-6003-2016, 2016
Short summary
Short summary
Marine planktonic diatoms are today both the main silica and carbon exporter to the deep sea. However, 50 million years ago, radiolarians were the main silica exporter and diatoms were a rare, geographically restricted group. Quantification of their rise to dominance suggest that diatom abundance is primarily controlled by the continental weathering and has a negative feedback, observable on a geological timescale, on the carbon cycle.
Johan Renaudie and David B. Lazarus
J. Micropalaeontol., 32, 59–86, https://doi.org/10.1144/jmpaleo2011-025, https://doi.org/10.1144/jmpaleo2011-025, 2013
Johan Renaudie and David B. Lazarus
J. Micropalaeontol., 31, 29–52, https://doi.org/10.1144/0262-821X10-026, https://doi.org/10.1144/0262-821X10-026, 2012
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