1. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia
2. Department of Geology and Geophysics, Novosibirsk State University, Novosibirsk 630090, Russia
3. Institute of Geology, Mongolian Academy of Sciences, Labor Union St., Ulaanbaatar 13330, Mongolia