Figure F4. Isotopic fractionation during MSR at Site 1225. A. delta18O-SO4 vs. fraction of SO4 remaining (ln f) in the upper MSR zone (0–200 mbsf) showing nonlinear behavior. B. Sulfate oxygen isotope enrichment factor, epsilon-SO4, for linear region of A. V-SMOW = Vienna-standard mean ocean water.

Figure F4. Isotopic fractionation during MSR at Site 1225. A.

¹⁸O-SO₄ vs. fraction of SO₄ remaining (ln f) in the upper MSR zone (0–200 mbsf) showing nonlinear behavior. B. Sulfate oxygen isotope enrichment factor,

-_SO4, for linear region of A. V-SMOW = Vienna-standard mean ocean water.