Fig. 8
Major element composition of mafic rocks depicted on an XMg vs. silica diagram. Meta-gabbro with red-rimmed symbols, meta-basalt (eclogite) with black-rimmed symbols. Pink field = least altered ZSU meta-gabbro. Gray shaded field = MORB. Average #Mg gabbro = 82, basalt = 54: Arrow = ∆#Mg (gabbro—basalt) = 28