Figure F45. Sulfate vs. alkalinity within the SRZ (0-150 mbsf) at Site 1165. The correlation line shows the theoretical relationship: 1 × SO₄^2- = 2 × HCO₃^- expected if sulfate behaves conservatively. Shaded circles = Hole 1165A; solid circles = Hole 1165B; and open circles = Hole 1165C.