Insights Into the Nature of Plume‐Ridge Interaction and Outflux of H ₂ O From the Galápagos Spreading Center

The flow of high-temperature and compositionally enriched material between mantle plumes nearby spreading centers influences up to 30% the global mid-ocean ridge system represents a significant, but currently unconstrained, flux volatiles out mantle. Here, we present new analyses H2O, F, Cl, S in basaltic glass chips from an archetypal region plume-ridge interaction, Galápagos Spreading Center (GSC). Our data set includes samples eastern GSC, on segments that are strongly influenced by adjacent plume, complements published largely western GSC. We use forward models melting investigate role solid melt-phase transport lithologically heterogeneous (peridotite-pyroxenite) interaction along approximately 1,000 km results indicate observed geochemical geophysical variations cannot be recreated only involve solid-state transfer plume Instead, show GSC well-matched incorporate channelized volatile-rich melts formed at high-pressures (>3 GPa) stem In addition, our demonstrate enriched, plume-derived melt can account for ∼60% H2O outgassed regions which most plume.