The petrological parameters Na-8 and Fe-8, which are Na2O and FeO contents in mid-ocean ridge basalt (MORB) melts corrected for fractionation effects to MgO8wt, have been widely used as indicators of the extent and pressure ...

Based on an evaluation of major and trace element data for ocean island basalts (OIB), we demonstrate that oceanic lithosphere thickness variation, which we refer to as the lid effect, exerts the primary control on OIB ...