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STRUCTURE, AGE, GEOCHEMICAL AND ISOTOPE-GEOCHEMICAL (SM/ND) COMPOSITION OF THE SERLIGSKAYA FORMATION, TANNU-OLA TERRAIN OF TUVA

E. V. Vetrov 1,2, A. N. Uvarov 1, I. A. Vishnevskaya 3, M. V. Chervyakovskaya 4, N. I. Vetrova 2, F. I. Zhimulev 2, E. S. Andreeva 1

1 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia; 2 V.S.Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia; 3 V.I.Vernandskiy Institute of Geochemistry and Analytical Chemistry of RAS, Moscow, Russia; 4 A.N. Zavaritskiy Institute of Geology and Geochemistry UB RAS, Ekaterinburg, Russia

The Serligskaya Formation constituting the main part of the Tannu-Ola terrain is composed of differentiated series from tholeitic basalts to plagiorhyolites, formed in the conditions of immature ocean island arc. The age of Serligskaya Formation is the Early Cambrian. The source of Serligskie magmas has mantle nature (εNd(T) from +5,7 to +7,7) and model age of 550–760 Ma (Late Riphean–Vendian).

Keywords: geochronology, isotope geochemistry, zircon, volcanism, Cambrian, Tuva, Tannu-Ola terrain.

DOI 10.20403/2078-0575-2020-1-81-94