Fig. 2

The diversity of plutonic rocks in the oceanic crust. Normative CIPW anorthite content (An) vs. Mg# values, 100 × Mg/(Mg + Fe), of starting materials used in previous experimental studies (brown circles) compared to variability of compositions for gabbroic rocks sampled in modern oceanic crusts. Red dots are from Godard et al. (2009) and blue dots from Perk et al. (2007). Stars are the two bulk compositions adopted in this study