Lithospheric uplift in eastern Gondwana: Evidence for a long-lived mantle plume system?

摘要: Recent work has demonstrated that modern drainage systems on rifted continental margins may be the product of ancient lithospheric doming in areas flood-basalt magmatism. This uplift is thought to reflect existence widespread mafic underplating and excess melt generation at rift zones. Here I show due initiation a thermal anomaly (plume head) asthenosphere evidenced by formation discrete structures persistent paleodrainage (sediment dispersal) patterns for up 150 m.y. prior commencement igneous activity final breakup. Volcanism thus occurs as comparatively late stage geochemical response long-term residence hot plume material beneath mantle lithosphere.