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Articles | Volume 22, issue 23
Articles | Volume 22, issue 23
https://doi.org/10.5194/bg-22-7973-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-7973-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 23
Research article
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12 Dec 2025
Research article | Highlight paper |  | 12 Dec 2025

Orbital-scale variability in the contribution of foraminifera and coccolithophores to pelagic carbonate production

Pauline Cornuault, Luc Beaufort, Heiko Pälike, Torsten Bickert, Karl-Heinz Baumann, and Michal Kucera

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Understanding the role of calcifying organism communities (here: coccolithophores vs. foraminifera) in determining the long-term burial of carbonate is of fundamental importance to understanding the carbon cycle over geologic time scales. This study proposes that the amount of carbonate buried through time does not primarily depend on whether coccolithophores or foraminifera were the dominant calcifying marine organisms at the time of sediment deposition.
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We present new high-resolution data of the relative contribution of the two main pelagic carbonate producers (coccoliths and foraminifera) to the total pelagic carbonate production from the tropical Atlantic in past warm periods since the Miocene. Our findings suggests that the two groups responded differently to orbital forcing and oceanic changes in tropical ocean, but their proportion changes did not drive the changes in overall pelagic carbonate deposition.
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