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(2020) 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


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09d: Room 3, Thursday 25th June 22:09 - 22:12

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Submitted by Elizabeth Swanner on Wednesday 24th June 03:30
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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