Passier, H.F. and Middelburg, J.J. and De Lange, G.J. and Bottcher, M.E. (1997) Pyrite contents, microtextures, and sulfur isotopes in relation to formation of the youngest eastern Mediterranean sapropel. Geology, 25, 519-522. ISSN 0091-7613.
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Pyrite within and below sapropels in the eastern Mediterranean is a result of microbial SO42- reduction within the sapropel, and the subsequent reaction of sulfide (HS-) with detrital Fe and Fe2+ diffusing upward from underlying sediments. Below the youngest Mediterranean sapropel, S1, pyrite (as much as 281 mu mol pyritic S/g) is mostly present as euhedral crystals, whereas within the sapropel only framboidal pyrite (as much as 360 mu mol pyritic S/g) has been detected. Framboidal microtextures indicate pyrite formation at the site of HS- production within the sapropel. Euhedral pyrite, below the sapropel, forms when sulfate reduction in the sapropel outcompetes iron liberation and supply, and HS- diffuses out of the sapropel. Sulfur isotope values of pyrite are extremely light in the sapropel (-37.3 parts per thousand to -38.2 parts per thousand) as well as below the sapropel (-45.6 parts per thousand and -49.6 parts per thousand), indicating that HS- has formed in a system with abundant SO42- and in the presence of oxidants. [KEYWORDS: Laboratory synthesis; marine-sediments]
|Institutes:||Nederlands Instituut voor Ecologie (NIOO)|
|Deposited On:||25 Nov 2011 01:00|
|Last Modified:||15 Jan 2014 09:35|
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