Pyroxenite xenoliths and clinopyroxene megacrysts from the Cenozoic Jbel Saghro Volcanic Field (Anti-Atlas, Morocco): Petrography, mineral chemistry and equilibration conditions

•Compositional diversity of pyroxenite xenoliths and clinopyroxene megacrysts in Saghro nephelinites is shown.•Mg-number and Cr2O3 contents of clinopyroxene increase from kaersutite-bearing clinopyroxenites to olivine clinopyroxenites.•Chemical compositions of clinopyroxene are used to identify the parental melt of pyroxenite xenoliths and megacrysts.•Crystallization of pyroxenite xenoliths and clinopyroxene megacrysts at a wide range of pressure (0.3−0.8 GPa).