Figure 13

Sulfide-sulfate Δ³³S vs. δ³⁴S values. Detailed legend: Difference between ∆³³S values of sulfide and sulfate as a function of difference between δ³⁴S values of sulfide and sulfate. Closed circle–FPL water, opened circle–surface sediment near FPL, closed diamond–FPS water, opened diamond–surface sediment near FPS, closed rectangle–DS water, opened rectangles–sediment core taken near DS, Xs–CP water at various depths, opened rectangles–sediment core taken near DS, closed triangle–EPS water, opened triangle–surface sediment near EPS, cross–OC water. Area confined by solid line depicts values for sulfur isotopes fractionation by microbial sulfate reduction calculated by [48] for the [54] model. Area confined by small-dash line depicts values for sulfur isotopes fractionation by microbial sulfur disproportionation [55]. Area confined by large-dash line depicts values for sulfur isotopes fractionation from this work in all springs and pools except DS.