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Geological Society, London, Special Publications; 1992; v. 64; p. 247-255;
DOI: 10.1144/GSL.SP.1992.064.01.16
© 1992 Geological Society of London

Diagenetic Conditions

Carbon/sulphur/iron relationships in upwelling sediments

John W. Morse1 & Kay C. Emeis2

1 Department of Oceanography, Texas A&M University, College Station, Texas 77843, USA
2 Geologisch-Paläontologisches Institut, Universität Kiel, Olshausenstrasse 40, 2300 Kiel, Germany

Carbon/sulphur/iron relationships in sediments from beneath three upwelling areas (Benguela, Peru and Oman) were investigated using DSDP and ODP cores. The three areas displayed markedly different C/S/Fe characteristics. Metabolizable organic matter appears to limit production of reduced sulphur in the Benguela upwelling area sediments, as evidenced by incomplete reduction of dissolved sulphate. On the Peru shelf infusion of a sulphate-containing brine at depth has a major influence on diagenesis.

Weight ratios of organic carbon to reduced inorganic sulphur are generally higher in sediments from upwelling areas than in normal marine sediments. C/S ratios generally increase with increasing organic carbon concentration in upwelling sediments. This does not appear to be the result of limited availability of reactive iron. Both carbon and reduced sulphur accumulation rates are well correlated with sediment accumulation rates, but are higher than in non-upwelling sediments having similar accumulation rates.