Articles | Volume 12, issue 4
https://doi.org/10.5194/bg-12-1169-2015
https://doi.org/10.5194/bg-12-1169-2015
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, https://doi.org/10.1029/2007GC001744, 2008.
Anbar, A. D. and Rouxel, O.: Metal Stable Isotopes in Paleoceanography, Annu. Rev. Earth Pl. Sc., 35, 717–746, https://doi.org/10.1146/annurev.earth.34.031405.125029, 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, https://doi.org/10.1016/j.cretres.2013.05.004, 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, https://doi.org/10.1016/j.earscirev.2013.02.008, 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, https://doi.org/10.1038/379243a0, 1996.
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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.
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