Аннотация:Experiments conducted at 800oС and 2 kbar show that interactions of phosphorus and fluorine with granitic melts under H-O-C fluid presence (XH2=0.03-0.04) induce a liquid cluster differentiation of melt into peraluminous and silicic compositions. The enrichment of phosphorus, fluorine, and other volatiles in residual granitic melts might result in the cryptic and contrasting liquid differentiation, with formation of layers as a mechanism of the magma evolution and ore concentration of extremely fractionated Li-F-P granite massifs.