Abstract
Mineral assemblages in spinel lherzolite xenoliths from the Cenozoic alkali basalt of eastern China were analyzed by 57Fe Mössbauer spectroscopy for Fe3+/ΣFe and distribution of Fe2+/Fe3+ in non-equivalent crystal cites. Orthopyroxene, clinopyroxene and spinel have 0.08–0.13, 0.19–0.31 and 0.13–0.23 Fe3+/ΣFe, respectively. The cation-exchange equilibrium temperatures, Fe3+ partition coefficient and oxygen fugacity of the upper mantle peridotites were calculated. The equilibrium temperatures are between 1103K and 1405K consistent with those reported elsewhere. The oxygen fugacities of spinel lherzolites calculated with olivine–orthopyroxene–spinel (ΔlogƒO2 from −1.1 to 0) and clinopyroxene–olivine–orthopyroxene oxybarometers (ΔlogƒO2 from −2.0 to 0.7) are consistent with previously reported upper mantle values.
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