Figure F12. A. K2O vs. SiO2 of Izu arc front lava compared with those of the rear-arc seamount chains. Average continental crust from Rudnick and Gao (2004). B. Chondrite-normalized rare earth element abundances of Izu arc front lava compared with those of the rear-arc seamount chain. In both A and B, rear-arc seamount chain patterns are similar to average continental crust. Figure modified from Tamura et al. (2007 and references therein)
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