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, Clinopyroxenes from this study have a substantial proportion of Fe present as Fe 3 (Fe 3 /Fe 22% on average in the 1.5 wt.% H 2 O experiments, 30% in the 4.5 wt.% H 2 O experiments; Fe 3 in cpx calculated from Lindsley, 1983) The Fe/Mg partition coefficient between clinopyroxene and melt, calculated with Fe in cpx Fe 2 (i.e., as for orthopyroxene), is 0.45 0.07 for the 1.5 wt.% H 2 O and 0.49 0.05 for the 4.5 wt.% H 2 O experiments, respectively. These values are higher than results from the literature (e.g., 0.35 0.05, Hirose and Kawamoto, 1995; 0.36 0.04, Kinzler, 1997; 0.33 0.02, Gaetani and Grove, 1998), although the data overlap in part These high Fe-Mg clinopyroxene-melt partition coefficients are attributed to the oxidizing conditions of our experiments. Spinels are Cr-Al spinels with Cr# (Cr/(Cr Al) ranging mostly between 20 and 28 and Mg# (calculated with Fe in sp Fe 2 ) between 63 and 81 (Tables 4, 5) In cpx-bearing crystalrich charges from the 4.5 wt.% H 2 O experiments (#11, 19), spinel has very low Cr# (5, Table 5) The Cr/(CrAl) of the spinel in charge #10 is heterogeneous (Table 4) Average Fe 3 / Fe of spinel is 48% for the less oxidized 1.5 wt.% H 2 O and 59% for the more oxidized 4.5 wt.% H 2 O experiments (Fe 3 calculated by assuming 32 O and 24 cations in the formula unit) The Fe/Mg partition coefficient between spinel and melt is 0.98 0.14 (calculated with Fe Fe 2 , both in spinel and melt) or 0 The experimental glasses obtained in this study are all basaltic in composition and are characterized by a narrow range of SiO 2 contents, from 48 to 50 wt.%. With progressive crystallization below the liquidus, TiO 2 contents are 0.5 wt.%. Na 2 O concentrations (0.55 to 1.18 wt.%) increase with pressure the latter being in good agreement with values in the literature (0.54 0.06, Kinzler the less MgO-rich) have SiO 2 contents near 50 wt.% and Al 2 O 3 near 19 wt.% (Table 4) at 7.5 wt.% MgO. In other words, these glasses approach the composition of certain high-alumina basalts, 1987.
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