Water and trace elements content in the ongonite melt from Ary-Bulak massif, Eastern Transbaikal'e (evidence from melt inclusions)

The ongonite represents the subvolcanic analog of rare earth metal Li fluoride garnets. Only melted inclusions are direct and reliable source of information about a composition of the primary magmatic melts, including the content of water, F, Cl and other volatile components as well as the elements-impurities. The ongonite mineral specimens of Ary-Bulak massif are investigated to find the primary melt inclusions. It is revealed that the rock is formed from magmatic melt whose crystallization temperature is 650-720°C. The magma of ongonites was enriched considerably by H2O (5-8.7 %), F (6-8 %), Li, Rb, Be, As. W and depleted by Sr, Ba, Pb. This testifies high degree of its differentiation.