F. A. Letnikov1, A. B. Kotov2, K. E. Degtyarev3, E. B. Sal’nikova2, O. A. Levchenkov2, M. M. Shershakova4, A. V. Shershakov4, N. G. Rizvanova2, A. F. Makeev2, M. D. Tolkachev2
1Institute of the Earth Crust, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia
2Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia
3Geological Institute, Russian Academy of Sciences, Moscow, Russia
4Mining-Geological Company “Ak-Bura,”, Shchuchinsk, Kazakhstan Republic
Tóm tắt
The isotopic-geochronological studies of zircons from granites of the Borovoe, Makinsk, and Zhukei massifs located in the eastern part of the Precambrian Kokchetav median massif revealed that they were formed during the relatively brief period from 431 to 423 Ma ago, which allowed them to be united into the Early Silurian Borovoe Complex.
