Аннотация:Close spatial association of phases with (Nb,Ti) Si and high-molecular organic compounds in Khibiny pegmatites allows us to assume that natural processes of bitumen formation (including polymerization and polycondensation with the formation of unsaturated hydrocarbons and, probably, phenols) could be catalyzed by Nb-rich silicates. In this case polymodal MM distribution for soluble part of bitumens can indicate the presence of several channels of polymerization reactions (for example, with different catalytic centers).
