Articles | Volume 11, issue 3
https://doi.org/10.5194/cp-11-495-2015
https://doi.org/10.5194/cp-11-495-2015
Research article
 | 
18 Mar 2015
Research article |  | 18 Mar 2015

Freshwater discharge controlled deposition of Cenomanian–Turonian black shales on the NW European epicontinental shelf (Wunstorf, northern Germany)

N. A. G. M. van Helmond, A. Sluijs, J. S. Sinninghe Damsté, G.-J. Reichart, S. Voigt, J. Erbacher, J. Pross, and H. Brinkhuis

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Cited articles

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Barclay, R. S., McElwain, J. C., and Sageman, B. B.: Carbon sequestration activated by avolcanic CO2 pulse during Oceanic Anoxic Event 2, Nat. Geosci., 3, 205–208, 2010.
Barron, E. J.: A warm, equable Cretaceous: the nature of the problem, Earth-Sci. Rev., 19, 305–338, 1983.
Bice, K. L., Birgel, D., Meyers, P. A., Dahl, K. A., Hinrichs, K.-U., and Norris, R. D.: A multiple proxy and model study of the Cretaceous upper ocean temperatures and atmospheric CO2 concentrations, Paleoceanography, 21, PA2002, https://doi.org/10.1029/2005PA001203, 2006.
Blättler, C. L., Jenkyns, H. C., Reynard, L. M., and Henderson, G. M.: Significant increases in global weathering during Oceanic Anoxic Events 1a and 2 indicated by calcium isotopes, Earth Planet. Sci. Lett., 309, 77–88,2011.
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Based on the chemistry and microfossils preserved in sediments deposited in a shallow sea, in the current Lower Saxony region (NW Germany), we conclude that changes in Earth’s orbit around the Sun led to enhanced rainfall and organic matter production. The additional supply of organic matter, depleting oxygen upon degradation, and freshwater, inhibiting the mixing of oxygen-rich surface waters with deeper waters, caused the development of oxygen-poor waters about 94 million years ago.