1. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky St. 1a, Irkutsk 664033, Russia
2. Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, 128 Lermontov Str, Irkutsk 664033, Russia
3. Irkutsk State University, 3 Lenin Str, Irkutsk 664025, Russia