Figure F49. Ti/Y vs. Zr plot from Pearce (1980) showing low-K tholeiites from Woodlark Island (Ashley and Flood, 1981) and the average value for Hole 1109D dolerite. Both sets of data plot in the overlap between the mid-ocean ridge basalt (MORB) field and the island arc tholeiite (IAT) field. WPB = within-plate basalts.