V. A. Vanin
Institute of the Earth's Crust of SB RAS, Irkutsk, Russia 
Russian Federation

post graduate student
Institute of the Earth’s crust of SB RAS
128 Lermontov street, Irkutsk 664033, Russia
Tel.: (3952)427117; fax: (3952)427000

D. P. Gladkochub
Institute of the Earth's Crust of SB RAS, Irkutsk, Russia 
Russian Federation

Doctor of Geology and Mineralogy, Director of the Institute
Institute of the Earth’s Crust, Siberian Branch of RAS
128 Lermontov street, Irkutsk 664033, Russia

T. V. Donskaya 
Institute of the Earth's Crust of SB RAS, Irkutsk, Russia 
Russian Federation

Candidate of Geology and Mineralogy, Senior researcher
Institute of the Earth’s Crust, Siberian Branch of RAS
128 Lermontov street, Irkutsk 664033, Russia