Figure F2. Site 1226 in the eastern equatorial Pacific. A. Gross rates of sulfate reduction (SR) measured by 35S-SO42– radiotracer experiments. Shaded circles = rate data below the detection limit of this method, blue circles = rates significantly above this limit. B. Sulfate and methane concentrations in pore water. C. Dissolved Mn and H2S concentrations in pore water (data from D'Hondt, Jørgensen, Miller et al., 2003; Parkes et al., 2005).