Davies, Geoffrey2015-12-081525-2027http://hdl.handle.net/1885/29418Geophysical evidence and numerical models of mantle stirring imply the source of mid-ocean ridge basalts (MORBs) comprises most of the mantle, excepting only the D″ region and the "superpile" anomalies deep under Africa and the Pacific. Geophysical evidKeywords: Mantle geochemistry; Mantle heat budget; Mantle heat sources; Mantle heterogeneity; Melt migration200910.1029/2009GC0026342016-02-24