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Sulfide, Sulfite, and Sulfate Production from Organic Sulfur in Archean Oceans and Modern Lakes
Katsev S, Fakhraee M, Hyde E, Petersen M, Sheik C & Schreiner K
Katsev S, Fakhraee M, Hyde E, Petersen M, Sheik C & Schreiner K (2020) Goldschmidt Abstracts, 2020 1256
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09d: Room 3, View in program
Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.
It seems that both sulfate reduction following Rayleigh distillation and organic sulfur cycling under low sulfate concentrations would produce the range of sulfur isotopes observed, based on your models. Are there any other expected indicators of the organic sulfur processing that might be useful to distinguish its imprint from that of sulfate reduction? I was unclear from the last plot if there were indicators from the patterns in minor S isotopes. (I'd appreciate a written response. Thanks!)
We could not suggest indicators that would unambiguously distinguish between processes that originated in organic sulfur vs. those that started with sulfate. (Perhaps someone else can?) As you mentioned, either pathway could produce the observed isotopic patterns, and non-isotopic evidence is limited for early rocks. One possible avenue could be to compare settings with different organic content, e.g. microbial mats vs deeper sediments. More organic matter would likely mean less fractionation in d34S, as solid sulfides could form from organic-released H2S.
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