Figure F14. Schematic cross-section showing the location of offset Sites BON-1A and BON-2A. Site BON-1A will drill fore-arc basalt (FAB) lavas into intrusive rocks to record the first magmatic products of subduction initiation. Site BON-2A will drill from boninites into FAB to record the transition from subduction initiation magmatism to normal arc magmatism.
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