Lithium isotope perspective for mélange diapir melting beneath the Ryukyu arc
A long-standing debate concerns whether arc magmas are generated by melting of a slab- metasomatized mantle wedge or by direct melting and dehydration of mélange diapirs. This study focused on the Ryukyu subduction zone, where new Li isotope measurements of subducting sediments reveal a transition from lighter Li isoto...