“…4). The geochemical and mineralogic features of these rocks have been described in sufficient detail in the appropriate literature (Ermakov and Vazheevskaya, 1973;Khubunaya et al, 1993Khubunaya et al, , 1998Khubunaya et al, , 2007Kersting and Arku lus, 1994;Ariskin et al, 1995;Volynets et al, 1999;Mironov, 2009, among others). All of these rocks possess similar petrographic characteristics, a similar list of rock forming minerals and their compositions, and similar concentrations of major elements and admixture ele ments ( Table 2).…”