Abstract
The generalized composition diagram of lower mantle diamonds-and-inclusions-forming melts demonstrates physico-chemical correlation of variable compositions of the melts with major and minor components of the parental system. Along with this, compositional links between the components set the stage for genetic classification of primary inclusions in lower mantle diamonds. The peritectic breakdown of ferriferous bridgmanite during fractional crystallization of diamond-parental melts opens up possibility for their ultrabasic-basic evolution. The features of the lower mantle diamond-producing systems which have displayed in physico-chemical experiments are in close agreement with the mantle-carbonatite conception of diamond genesis.
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