Abstract
We have determined the isobarically univariant melting relations of the lherzolite phase assemblage in the CMASF system in the only at small degrees of melting. 0·7–2·8 GPa pressure range. Isobarically, for every 1 wt % increase in the FeO content of the melt in equilibrium with the lherzolite phase assemblage, the equilibrium temperature is lower KEY WORDS: CMASF; lherzolite solidus; mantle melting by about 3–5°C. Relative to the solidus of model lherzolite in the CaO–MgO–Al2O3–SiO2 system, melt compositions in the CMASF system are displaced slightly towards the alkalic side of the basalt tetrahedron. The transition on the solidus from spinel to plagioclase
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