Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60..751p&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 60, Issue 5, p. 751-763.
Computer Science
18
Scientific paper
Recurrent organic-rich layers (sapropels) in eastern Mediterranean sediments are enriched in Corg, Fe, and S. Sulphur and Fe are enriched in a zone immediately below the sapropels, whereas Corg is not. δ34S values of bulk sediments and simple mass-balance calculations indicate that SO42- reduction has taken place in an open system, with all HS- formed at, or close to, the sediment surface. Formation of pyrite in the sapropel was Fe-limited and consequently, excess HS- was able to migrate downwards (downward sulphidisation). This resulted in the formation of pyrite below the sapropel by reaction of this HS- with solid-phase ferric iron and Fe2+ diffusing upwards from underlying sediments. The Fe2+ source probably includes Fe (hydr) oxide layers formed at former oxidation fronts above previously deposited and buried sapropels. This downward sulphidisation mechanism allows accumulation of twice as much S in alternating organic-rich-anoxic/organic-poor-suboxic sediments compared to what is preserved in organic-rich anoxic sediments.
de Lange Gert. J.
Middelburg Jack J.
Passier Hilde F.
van Os Bertil J. H.
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