Articles | Volume 16, issue 2
Research article
29 Apr 2020
Research article |  | 29 Apr 2020

Cretaceous oceanic anoxic events prolonged by phosphorus cycle feedbacks

Sebastian Beil, Wolfgang Kuhnt, Ann Holbourn, Florian Scholz, Julian Oxmann, Klaus Wallmann, Janne Lorenzen, Mohamed Aquit, and El Hassane Chellai

Data sets

Cretaceous Oceanic Anoxic Events prolonged by phosphorus cycle feedbacks, data from SN4 and La Bedoule S. Beil, W. Kuhnt, A. Holbourn, F. Scholz, K. Wallmann, J. Lorenzen, M. Aquit, and E. H. Chellai

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.