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Articles | Volume 22, issue 8
Articles | Volume 22, issue 8
https://doi.org/10.5194/bg-22-1929-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-1929-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 8
Research article
 | Highlight paper
 | 
22 Apr 2025
Research article | Highlight paper |  | 22 Apr 2025

Cenozoic pelagic accumulation rates and biased sampling of the deep-sea record

Johan Renaudie and David B. Lazarus

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Cited articles

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Berner, R. A., Lasaga, A. C., and Garrels, R. M.: The carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the past 100 million years, Am. J. Sci., 283, 641–683, https://doi.org/10.2475/ajs.283.7.641, 1983. a
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Caves Rugenstein, J. K., Ibarra, D. E., and von Blanckenburg, F.: Neogene cooling driven by land surface reactivity rather than increased weathering fluxes, Nature, 571, 99–102, https://doi.org/10.1038/s41586-019-1332-y, 2019. a, b, c, d, e
Coffin, M. F., McKenzie, J., Davis, E., Dickens, G., Ellins, K., Erzinger, J., Huchon, P., Kemp., A., Rea D., Suyehiro K., and Tatsumi Y.: Earth, Oceans, and Life. Scientific Investigations of the Earth System using Multiple Drilling Platforms and New Technologies, Integrated Ocean Drilling Program Initial Science Plan, 2003–2013, Integrated Ocean Drilling Program, https://www.iodp.org/iodp-legacy/iodp-2003-2013-documents/iodp-2003-2013-general-reference-documents/735-iodp-2003-2013-initial-science-plan/file (last access: 15 April 2025), 2001. a
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This paper reveals a previously unrecognized bias in the marine sediment record, challenging conventional interpretations of long-term carbon sequestration and weathering trends. While biases in the fossil and geological records are well-studied, this study demonstrates that deep-sea sedimentation data are also systematically skewed, necessitating a critical reevaluation of widely used paleoceanographic proxies. As a comprehensive meta-analysis of marine core data, these findings have far-reaching implications, highlighting the need to account for age-dependent biases in sedimentation-related proxies to refine our understanding of Earth's past climate and carbon cycle dynamics.
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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 shows, contrary to prior estimates, a more stable history, thus providing some insights on the past mismatch between physico-chemical model estimates and observations.
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