The first determination of the andesite-dacite complex isotope age of the Middle Urals Еastern zone

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Abstract


In the paper are given the results of the first performed U-Pb dating of zircons from dacites and volcanic paleostructure of the Eastern zone andesite-dacite complex of the Urals orogen middle-uralian part, consisting of retro-overthrusted and cover-folded structural subzones. Volcanogenic complex, including vent and nearvent facies, occurs among flyschoid and carbonate deposits with the Middle Devonian fauna in cover-folded structural subzone forming an extreme eastern orogen limitation. Zircon grain age made up 389±5,6 Ma that also correlates with Middle Devonian. Consequently the formation of sedimentary and volcanogenic complexes occurred in a close age interval, but judging by their composition and structure, in different environmental conditions. Sedimentary formations accumulated in shallow basins, and the volcanic ones have been formed, apparently, under sub-areal conditions surrounded by the shallow sea basin. It is assumed that the manifestation of andesite-dacite volcanism, most probably, testifies to the spatial and age displacement of geodynamical and facies conditions to the eastern periphery of the orogen.


About the authors

V. A. Koroteev

Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences

Email: v.chervyakovskiy@mail.ru

Russian Federation, 15, Akademik Vonsovskij str., Ekaterinburg, 620016

Academician of the Russian Academy of Sciences

V. S. Chervyakovskiy

Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: v.chervyakovskiy@mail.ru

Russian Federation, 15, Akademik Vonsovskij str., Ekaterinburg, 620016

M. V. Zaitseva

Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences

Email: v.chervyakovskiy@mail.ru

Russian Federation, 15, Akademik Vonsovskij str., Ekaterinburg, 620016

E. N. Volchek

Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences

Email: v.chervyakovskiy@mail.ru

Russian Federation, 15, Akademik Vonsovskij str., Ekaterinburg, 620016

V. M. Necheukhin

Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences

Email: v.chervyakovskiy@mail.ru

Russian Federation, 15, Akademik Vonsovskij str., Ekaterinburg, 620016

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