Figure 10. Melting diagram for the system nephelines-diopsides-titanite, after [Veksler and Teptelev, 1990]. Di - diopside, Prv - perovskite, Ttn - titanite, Mel - melilite, Cg - carnegieite, Ne - nepheline, Ol - olivine, L1 + L2 - immiscibility region. Point A signifies the weighted mean composition for the Kovdor-type primary alkaline ultramafic magma. Point A1 represents the hypothetical primary magma of the Khibiny-type alkaline ultramafic series, whose composition has been changed by mixing with phonolitic melt.