DIAGENETIC PYRITISATION UNDER EASTERN MEDITERRANEAN SAPROPELS CAUSED BY DOWNWARD SULPHIDE DIFFUSION
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dc.contributor.author | Passier H.F. | |
dc.contributor.author | Middelburg J.J. | |
dc.contributor.author | van Os B.J.H. | |
dc.contributor.author | de Lange G.J. | |
dc.date.accessioned | 2020-11-23T07:52:12Z | |
dc.date.available | 2020-11-23T07:52:12Z | |
dc.date.issued | 1996 | |
dc.identifier | https://elibrary.ru/item.asp?id=491565 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1996, , 5, 751-763 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/19379 | |
dc.description.abstract | 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 SO2-4 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. | |
dc.title | DIAGENETIC PYRITISATION UNDER EASTERN MEDITERRANEAN SAPROPELS CAUSED BY DOWNWARD SULPHIDE DIFFUSION | |
dc.type | Статья |
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