Figure F1. Plots of chemical variations of primary phases (clinopyroxene, orthopyroxene, and olivine) and secondary phases (serpentine and iowaite) in Hole 1274A. A. FeO vs. MgO of primary phases clinopyroxene, orthopyroxene, and olivine. B. Al2O3 vs. Mg# of primary phases clinopyroxene, orthopyroxene, and olivine. C. NiO vs. Cr2O3 in orthopyroxene, clinopyroxene 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-member compositions are shown (amu = atomic mass units). G. Cl vs. MgO of serpentine after olivine and orthopyroxene, filling veins, and iowaite. * = analyses are iowaite-serpentine mixtures.

Figure F1. Plots of chemical variations of primary phases (clinopyroxene, orthopyroxene, and olivine) and secondary phases (serpentine and iowaite) in Hole 1274A. A. FeO vs. MgO of primary phases clinopyroxene, orthopyroxene, and olivine. B. Al₂O₃ vs. Mg# of primary phases clinopyroxene, orthopyroxene, and olivine. C. NiO vs. Cr₂O₃ in orthopyroxene, clinopyroxene 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-member compositions are shown (amu = atomic mass units). G. Cl vs. MgO of serpentine after olivine and orthopyroxene, filling veins, and iowaite. * = analyses are iowaite-serpentine mixtures.