Figure F230. Volatile-free FeO versus MgO whole-rock concentrations of Site U1309 peridotites. Published data are also shown for comparison: Mid-Atlantic Ridge (MAR) peridotites from Leg 153 Site 920 (Casey, 1997), data from the Southwest Indian Ridge (SWIR) (Snow and Dick, 1995), drilled peridotites from the Izu-Bonin-Mariana (IBM) forearc (Parkinson and Pearce, 1998), East Pacific Rise (EPR) peridotites (Niu and Hekinian, 1997), Western Alps orogenic lherzolites and ophiolites (Lanzo; Bodinier, 1988), Internal Ligurides (IL) (Rampone et al, 1996), and Oman ophiolite (Godard et al, 2000; Gerbert-Gaillard, 2002; M. Godard, unpubl. data). Indonesia = from Monnier, 1996. Kane FZ = Kane Fracture Zone. Whole-rock compositions are presented on a volatile-free basis assuming all Fe is FeO. Solid black lines show olivine and orthopyroxene composition as a function of Fe/Mg. Fine gray lines show constant values of Mg# (Mg# = 100 × molar Mg/[Mg + Fetotal]).
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