Figure F3. Plots of chemical variations of primary phases (orthopyroxene and olivine) and secondary phases (serpentine and iowaite) in Hole 1272A. A. FeO vs. MgO of primary phases orthopyroxene and olivine. B. Al2O3 vs. Mg# of primary phases orthopyroxene and olivine. C. NiO vs. Cr2O3 in orthopyroxene and olivine. D. FeOtot vs. MgO of primary phases orthopyroxene and olivine and serpentine forming pseudomorphs after olivine and orthopyroxene, filling veins, and iowaite. E. Al2O3 vs. Cr2O3 of serpentine after olivine and orthopyroxene, filling veins, and iowaite. F. Cation proportions Mg + Fe vs. Si of serpentine forming pseudomorphs after olivine and orthopyroxene, filling veins, and iowaite (for the figure iowaite is based on 7 O). Mineral end-members are shown (amu = atomic mass unit). G. Cl vs. MgO of serpentine after olivine and orthopyroxene, filling veins. H. Cl vs. MgO of serpentine after olivine and orthopyroxene, filling veins, and iowaite. * = analyses are iowaite-serpentine mixed analyses.

Figure F3. Plots of chemical variations of primary phases (orthopyroxene and olivine) and secondary phases (serpentine and iowaite) in Hole 1272A. A. FeO vs. MgO of primary phases orthopyroxene and olivine. B. Al₂O₃ vs. Mg# of primary phases orthopyroxene and olivine. C. NiO vs. Cr₂O₃ in orthopyroxene and olivine. D. FeO_tot vs. MgO of primary phases orthopyroxene and olivine and serpentine forming pseudomorphs after olivine and orthopyroxene, filling veins, and iowaite. E. Al₂O₃ vs. Cr₂O₃ of serpentine after olivine and orthopyroxene, filling veins, and iowaite. F. Cation proportions Mg + Fe vs. Si of serpentine forming pseudomorphs after olivine and orthopyroxene, filling veins, and iowaite (for the figure iowaite is based on 7 O). Mineral end-members are shown (amu = atomic mass unit). G. Cl vs. MgO of serpentine after olivine and orthopyroxene, filling veins. H. Cl vs. MgO of serpentine after olivine and orthopyroxene, filling veins, and iowaite. * = analyses are iowaite-serpentine mixed analyses.