Computer Science
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51...17f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 1, pp.17-27
Computer Science
10
Scientific paper
The evolution of the sulphur content of humic acids extracted from a near-shore sediment core was investigated. Special attention was taken to avoid S contamination of the humic materials during extraction. The S / C ratios increased continuously with depth to values which strongly suggest S addition to the humic matrix during early diagenesis by reactions between organic matter and H 2 S or its oxidation products. Their light isotopic composition supports this view, however, subsequent isotopic exchange has obscured the mechanism initially involved. Since a large fraction of the enrichment occurred above the sulphidic zone, redox boundaries, such as the interface of anoxic microniches within more oxidized zones, or the sulphidic/suboxic boundary of the sediment column, must have been important sites for S addition. Bioturbation, by increasing the contact between sedimentary zones of a different redox regime, will likely enhance such processes.
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