Controls on C/S ratios in hemipelagic upwelling sediments

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ID: 296724
1990
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Abstract
The relationship between organic carbon and reduced sulfur concentrations was investigated in hemipelagic sediments underlying highly productive regions of the ocean and oxic to suboxic waters (the Benguela upwelling area, Peru and Oman margins). At all three sites the degree of pyritization averaged close to 0.4, indicating that reactive iron was probably not limiting for pyrite formation. Complete sulfate reduction occurred in the upper sections of the sediments from the Oman and Peru margins. However, dissolved sulfate never decreased below 5 mM in the Benguela upwelling sediments. The authors attribute this to more advanced organic matter degradation at the Benguela upwelling site. C/S ratios increased with increasing organic carbon concentrations at all sites. For sediments with greater than 3 wt% TOC, the C/S ratio averaged about 1.3 and 1.8 times the normal marine ratio of 2.8 at the Benguela upwelling and Peru margin sites, respectively, but 2.9 times this value in the Oman margin sediments. They hypothesize that the quality of the organic matter undergoing burial and rates of near interfacial transport processes are the dominant controls on sulfur burial in these sediments.
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openalex_W2088186889 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors John W. Morse, Kay‐Christian Emeis
Journal american journal of science
Year 1990
DOI
10.2475/ajs.290.10.1117
URL
https://ajsonline.org/article/60509.pdf
Keywords Keywords not found

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