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Starting material SC1 was the same as used by Brey et al. (1990Brey et al. ( , 2008. It consists of remixed olivine, orthopyroxene, clinopyroxene, and spinel originally separated from spinel lherzolite sample SC1 (Jagoutz et al., 1979) and ground to 520 mm. SC1 is a proxy for a fertile mantle composition and is similar to MixKLB-1 studied by and . The compositions of the minerals are listed inTable 1 together with the original bulk composition and that of the mineral mix. The latter was determined by electron microprobe analysis (EMPA) from a glass bead prepared from 20 mg SC1 blended with 20 mg high-purity SiO 2 , which was added to avoid the formation of quench crystals. Trace elements were analysed in this glass by LA ICP MS.Three experiments were carried out with mixture CL1, a composition estimated to be a melt in equilibrium with magnesite-bearing harzburgite at 6 GPa and 14008C (Table 1). This mixture was prepared from pure chemical reagents [SiO