Articles | Volume 12, issue 4
Reviews and syntheses
24 Feb 2015
Reviews and syntheses |  | 24 Feb 2015

Records of past mid-depth ventilation: Cretaceous ocean anoxic event 2 vs. Recent oxygen minimum zones

J. Schönfeld, W. Kuhnt, Z. Erdem, S. Flögel, N. Glock, M. Aquit, M. Frank, and A. Holbourn

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Cited articles

Agnihotri, R., Altabet, M. A., Herbert, T. D., and Tierney, J. E.: Subdecadally resolved paleoceanography of the Peru margin during the last two millennia, Geochem. Geophy. Geosy., 9, 1525–2027,, 2008.
Anbar, A. D. and Rouxel, O.: Metal Stable Isotopes in Paleoceanography, Annu. Rev. Earth Pl. Sc., 35, 717–746,, 2007.
Aquit, M., Kuhnt, W., Holbourn, A., Chellai, E. H., Stattegger, K., Kluth, O., and Jabour, H.: Late Cretaceous paleoenvironmental evolution of the Tarfaya Atlantic coastal basin, SW Morocco, Cretaceous Res,. 45, 288–305,, 2013.
Arndt, S., Jørgensen, B. B., LaRowe, D. E., Middelburg, J. J., Pancoste, R. D., and Regnier, P.: Quantifying the degradation of organic matter in marine sediments: A review and synthesis, Earth-Sci. Rev., 123, 53–86,, 2013.
Behl, R. J. and Kennett, J. P.: Brief interstadial events in the Santa Barbara Basin, NE Pacific, during the past 60 kyr, Nature, 379, 243–246,, 1996.
Short summary
Today’s oceans show distinct mid-depth oxygen minima while whole oceanic basins became transiently anoxic in the Mesozoic. To constrain past bottom-water oxygenation, we compared sediments from the Peruvian OMZ with the Cenomanian OAE 2 from Morocco. Corg accumulation rates in laminated OAE 2 sections match Holocene rates off Peru. Laminated deposits are found at oxygen levels of < 7µmol kg-1; crab burrows appear at 10µmol kg-1 today, both defining threshold values for palaeoreconstructions.
Final-revised paper