The origin of Cenozoic basalts from central Inner Mongolia, East China: The consequence of recent mantle metasomatism genetically associated with seismically observed paleo-Pacific slab in the mantle transition zone

Because of the known presence of subducted oceanic lithosphere beneath eastern China and because of the close resemblance of the intra-plate CIM alkaline basalts with the present-day ocean island basalts (OIBs) in terms of incompatible element systematics, we emphasize the potential role of subducted ocean crust in mantle source regions of oceanic basalts, including E-MORBs (enriched type mid-ocean ridge basalts) and OIBs, but low-F melt metasomatism in the source regions is required as the principal enrichment mechanism because otherwise it is unlikely to produce incompatible-element enriched signature in E-MORB and OIB.