Figure 8. Variation with depth of major element composition (calculated dry) in the metamorphosed mafic rocks in Hole 900A. Fe₃/Fe₂ is the oxidation ratio and shorthand for Fe₂O₃/FeO. The Mg# is based on FeO = .85 FeO_t. The abbreviated core numbers correspond to the samples listed in Table 3 and are in order of depth, although spacing between samples is not uniform. The compositional data for this figure have been recalculated from Table 3.