Institution: | a Geological Institute, Siberian Branch of the Russian Academy of Sciences, ul. Sakh’yanovoi 6a, Ulan-Ude, 670047, Russia;b St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia;c A.P. Karpinsky Russian Geological Research Institute (VSEGEI), Center of Isotopic Research, Srednii pr. 74, St. Petersburg, 199106, Russia |