The involvement of deep plume-related materials in the South Atlantic Ocean asthenosphere as indicated by isotopic independent component analysis of basalts

An iron isotopic perspective for the material flow from off-axis mantle plume to mid-ocean ridge system

“…4A), which further indicates the presence of a large amount of plume-type pyroxenites in the plume-affected asthenosphere ow between the mantle plume and the MOR. Moreover, under the control of asthenosphere ow affected by the interaction of the plume and ridge 20,21 , these plume-type pyroxenites, as carriers of the enriched mantle plume component signal, can be systematically transported to the sub-ridge melting zone.…”

“…These melt deposits have the potential to randomly enter the depleted peridotite mantle domain and undergo partial melting in the MOR system 17,18,19 . Moreover, the distribution of the enriched mantle plume compositional signature along the MOR system can indicate the propagation and migration path of plume materials into the MOR mantle source 20,21 . However, it remains unclear whether pyroxenite originated from mantle plumes (referred to as plume-type pyroxenite), which serves as carrier materials with speci c mantle plume componential signatures, can be directly transported from the off-axis plume into the MOR magma system.…”

“…The Saint Helena plume, as the earliest in uence on the lithosphere underlying Gondwana continent in the South Atlantic, played an important role in the opening of the South Atlantic and the formation of the SMAR system 26,27 . Currently, the off-axis Saint Helena plume still exerts a signi cant in uence on the geochemical and geophysical properties of the nearby SMAR system 20,21,28,29,30 . This study focuses on the section of the SMAR system closest to the Saint Helena plume (Fig.…”