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Geological Society, London, Special Publications; 1987; v. 31; p. 167-177;
DOI: 10.1144/GSL.SP.1987.031.01.13
© 1987 Geological Society of London

Geochemical oxidation fronts in NE Atlantic distal turbidites and their effects in the sedimentary record

J. Thomson, S. Colley, N. C. Higgs, D. J. Hydes & T. R. S. Wilson

Institute of Oceanographic Sciences, Brook Road, Wormley, Godalming, Surrey GU8 5UB, U.K.

J. Sørensen

Institute of Ecology and Genetics, University of Aarhus, Aarhus, Denmark

Overall sediment accumulation on the abyssal plain E of Great Meteor Seamount is dominated by distal turbidite deposition. A colour contrast is seen at the tops of many individual turbidites, so that a single turbidite has two distinct colour tones. Porewater data from the uppermost turbidite are used to demonstrate that these colour contrasts are consequences of an oxidation-front phenomenon. Distributions of organic carbon, uranium, vanadium and copper are proposed as diagnostic solid-phase indicators in both active and fossil types. A generalized description of the features of such turbidites is presented.