The role of edge-driven convection in the generation ofvolcanism – Part 2: Interaction with mantle plumes, applied to the Canary Islands

Abstract. In the eastern Atlantic Ocean, several volcanic archipelagos are located close to margin of African continent. This configuration has inspired previous studies suggest an important role edge-driven convection (EDC) in generation intraplate magmatism. a companion paper (Manjón-Cabeza Córdoba and Ballmer, 2021), we showed that EDC alone is insufficient sustain magmatism magnitude required match volume these islands. However, also found readily develops near step lithospheric thickness, such as oceanic–continental transition (“edge”) along western cratonic margin. this work, carry out 3D numerical models mantle flow melting explore possible interactions between plumes. We find stem plume rises edge significantly deflected ocean-ward (i.e., away from edge). The pancake ponding hot material at base lithosphere by cell (either or towards amount deflection depends on initial geometric configuration, i.e., distance edge. Plume buoyancy flux temperature control magmatism, influence style extent plume–EDC interaction. Finally, comparison model predictions with observations reveals Canary may be affected EDC, accounting for widespread coeval activity. Our work shows many peculiar characteristics volcanism compatible theory once effects considered.