Figure 8
Plot of sulfate fraction produced by shallow sulfide oxidation vs . parent water body fraction. Detailed legend: Plot of sulfate fraction produced by shallow sulfide oxidation vs. parent water body fraction. Increase in sulfate fraction produced by shallow sulfide oxidation accompanied by decrease of parent water fraction points to dilution combined to sulfide oxidation by oxygen from shallow water. Increase in sulfate fraction produced by shallow sulfide oxidation at constant parent water fraction points to near surface sulfide oxidation by atmospheric oxygen.