The stable isotopes of sulfur include 32S (95.02 %), 33S (0.75 %), 34S (4.21 %) and 36S (0.02 %). Most sulfur isotope studies have focused on 32S and 34S, while 33S has been included later as the analytical techniques and the know-how were developed (e.g., Farquhar et al., 2003; Johnston et al., 2007). Stable isotopes provide an important tool to interpret the sulfur cycle of marine sediments in the present and in the geological past. Originally, the literature on sulfur isotope fractionation in marine sediments mostly assumed closed system...
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