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

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Cited articles

Anderson, L. D., Delaney, M. L., and Faul, K. L.: Carbon to phosphorus ratios in sediments: Implications for nutrient cycling, Global Biogeochem. Cy., 15, 65–79,, 2001. 
Ando, A., Huber, B. T., MacLeod, K. G., Ohta, T., and Khim, B. K.: Blake Nose stable isotopic evidence against the mid-Cenomanian glaciation hypothesis, Geology, 37, 451–454,, 2009. 
Arning, E. T., Birgel, D., Brunner, B., and Peckmann, J.: Bacterial formation of phosphatic laminites off Peru, Geobiology, 7, 295–307,, 2009a. 
Arning, E. T., Lückge, A., Breuer, L. C., Gussone, N., Birgel, D., and Peckmann, J.: Genesis of phosphorite crusts off Peru, Mar. Geol., 262, 68–81,, 2009b. 
Arthur, M. A., Dean, W. E., and Schlanger, S. O.: Variations in the Global Carbon Cycle During the Cretaceous Related to Climate, Volcanism, and Changes in Atmospheric CO2, in: The Carbon Cycle and Atmospheric CO2: Natural Variations Archean to Present, edited by: Sundquist, E. and Broecker, W., American Geophysical Union, Washington D.C., USA, 32, 504–529,, 1985. 
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.