Articles | Volume 16, issue 2
https://doi.org/10.5194/cp-16-757-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-16-757-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
29 Apr 2020
Research article |
| 29 Apr 2020
| 29 Apr 2020
Cretaceous oceanic anoxic events prolonged by phosphorus cycle feedbacks
Sebastian Beil
CORRESPONDING AUTHOR
Institute of Geosciences, Kiel University,
Ludewig-Meyn-Str. 10–14, 24118 Kiel, Germany
Wolfgang Kuhnt
CORRESPONDING AUTHOR
Institute of Geosciences, Kiel University,
Ludewig-Meyn-Str. 10–14, 24118 Kiel, Germany
Ann Holbourn
Institute of Geosciences, Kiel University,
Ludewig-Meyn-Str. 10–14, 24118 Kiel, Germany
Florian Scholz
GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1–3,
24148 Kiel, Germany
Julian Oxmann
GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1–3,
24148 Kiel, Germany
Klaus Wallmann
GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1–3,
24148 Kiel, Germany
Janne Lorenzen
Institute of Geosciences, Kiel University,
Ludewig-Meyn-Str. 10–14, 24118 Kiel, Germany
Mohamed Aquit
OCP S.A., Direction de Recherche et Développement, Recherche
Géologique, 46300 Youssoufia, Morocco
El Hassane Chellai
Department of Geology, Faculty of Sciences Semlalia, Cadi Ayyad
University, Marrakesh, Morocco
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Discussed (final revised paper)
Latest update: 28 Aug 2025
Short summary
Comparison of Cretaceous OAE1a and OAE2 in two drill cores with unusually high sedimentation rates shows that long-lasting negative δ13C excursions precede the positive δ13C excursions and that the evolution of the marine δ13C positive excursions is similar during both OAEs, although the durations of individual phases differ substantially. Phosphorus speciation data across OAE2 and the Mid-Cenomanian Event suggest a positive feedback loop, enhancing marine productivity during OAEs.
Comparison of Cretaceous OAE1a and OAE2 in two drill cores with unusually high sedimentation...
