Large magnesium isotope fractionation in peridotite xenoliths from eastern North China craton: Product of melt–rock interaction

To investigate the effects of melt–rock interaction on Mg isotope fractionation and mantle Mg isotopic heterogeneity, we report high-precision Mg isotopic data of olivine (Ol), orthopyroxene (Opx), clinopyroxene (Cpx) and spinel (Spl) for 25 peridotite xenoliths from the eastern North China craton. These xenoliths range from lherzolites, Cpx-rich lherzolites to wehrlites, and are variably metasomatised. The lherzolites have Ol with Fo contents...