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Depth Localization of Denitrification in a Deep-Sea Sediment from the Madeira Abyssal Plain

J. Sorensen, K. S. Jorgensen, S. Colley, D. J. Hydes, J. Thomson and T. R. S. Wilson
Limnology and Oceanography
Vol. 32, No. 3 (May, 1987), pp. 758-762
Stable URL: http://www.jstor.org/stable/2836770
Page Count: 5
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Depth Localization of Denitrification in a Deep-Sea Sediment from the Madeira Abyssal Plain
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Abstract

Sediments of the Madeira Abyssal Plain are dominated by alternate sequences of pelagic sediment and "turbidites" composed of relatively organic-rich material transported from the continental margin. After the deposition of a turbidite and resumption of pelagic sedimentation, the zones of O2 and NO3 - respiration progress slowly into the turbidite from above. The oxidation front is characterized by depletion of O2 and NO3 - at almost identical depths. Data are presented to show that NO3- respiration (denitrification) within such a turbidite is localized in a very small depth interval at the oxidation front.

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