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Figure F7. Basaltic vs. boninitic character as a function of the age of the lava following subduction initiation in the Bonin fore arc. Fore-arc basalt (FAB) erupts first and at the end (Hahajima), but otherwise boninites dominate. Boninites are characteristic of subduction initiation, and the full stratigraphy would enable their tectonic significance to be explained better. Data are from Pearce et al. (1999), Reagan et al. (2010), and Ishizuka et al. (2011). MORB = mid-ocean-ridge basalt, IAB = island arc basalt.

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