S. I. Kostrovitsky
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences; Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences
Russian Federation

1а Favorsky St, Irkutsk 664033

128 Lermontov St, Irkutsk 664033

T. V. Kalashnikova
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
Russian Federation

1а Favorsky St, Irkutsk 664033

I. V. Ashchepkov
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences; Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Russian Federation

1а Favorsky St, Irkutsk 664033

3 Academician Koptyug Ave, Novosibirsk 630090