Figure 8. Oxide variation diagrams with MgO as abscissa for all available analyses of flows from Leg 152 and Leg 163. All in wt% oxides calculated anhydrous and iron distributed between FeO and Fe2O3 (not shown) following Kilinc et al. (1983). Analyses with >5% loss on ignition has been excluded. Model calculation of fractional crystallization is shown and calculated as described in the text for Sections 163-989B-10R-7 and 152-917A-86R-7 (Table 2). The latter is extended to the inferred "Primary Melt" to show the early olivine fractionation (Thy et al., 1998). The model calculation for 152-917A-86R-7 is ticked by intervals of 5% fractionation. The appearances of Fe-Ti oxides in the crystallization models are at 75% fractionation for 152-917A-86R7 and 65% for 163-989B-10R-7. The curve marked olivine illustrates the effect of suppression of plagioclase (and augite). The marked bends of the model curves are for the appearances of plagioclase, augite, and Fe-Ti oxide minerals, except for the latter, as experimentally determined.
