Novel U-Pb isotopic zircon data on the rhyolite of the Saf’yanovskoe Cu-Zn deposit (Middle Urals)
https://doi.org/10.24930/1681-9004-2021-21-6-884-893
Abstract
Research subject. Zircons from the Saf’yanovskoe Cu-Zn deposit rhyolite (Middle Urals). For the first time, zircon U-Pb dating for the rhyolite of the ore-bearing volcanic-sedimentary rocks of the Saf’yanovskoe deposit was performed. The volcanites are characterized by an andesite-rhyodacite composition and are localized at the southern edge of the Rezhevskaya structural-formation zone (SFZ) of the Eastern Ural megazone. A number of publications assign these rocks either to the basalt-rhyolite formation of the Middle Devonian, or to the basalt-andesite-dacite-rhyolite formation of the Lower-Middle Devonian.
Aim. To estimate the age of the ore-bearing volcanic rocks under study using the U-Pb SHRIMP-II isotop ic system of zircon from the rhyolite of the eastern side of the Saf’yanovskoe deposit. By its chemical composition, the rhyolite belongs to the silicic varieties of subvolcanic rocks.
Methods and results. The U-Pb isotopic system of zircon was studied by 5-collector mass-spectrometer of high precision and emission of the secondary ions SHRIMP-II (ASI, Australia) in the VSЕGEI Institute. U-Pb relations were investigated by a procedure developed by I.S. Williams. The U-Pb data obtained based on 13 zircon grains showed the age of 422.8 ± 3.7 Ma. Conclusions. The U-Pb dating of zircon obtained previously from the lens-shaped andesite bodies of the western side of the Safyanovskoe deposit gave the age of 422.8 Ma, which corresponds to the Przydoli series epoch of the Upper Silurian. We established that, among the volcanic rocks of the Saf’yanovskoe deposit, the effusive formations of the Upper Silurian are present.
Keywords
Supporting agencies: The studies were carried out as part of the IGG UB RAS state assignment (state registration No. АААА-А18-118052590032-6) using the facilities of the «Geoanalitik» analytical centre of the IGG UB RAS. The upgrading and development of the «Geoanalitik» analytical centre is financially supported by the grant of the Ministry of Science and Higher Education of the Russian Federation (agreement No. 075-15-2021-680)
About the Authors
M. E. Prytchin
A.N. Zavaritsky Institute of Geology and Geochemistry, Ural Branch of RAS
Russian Federation
Russian Federation
15 Akad. Vonsovsky st., Ekaterinburg 620110
E. I. Soroka
A.N. Zavaritsky Institute of Geology and Geochemistry, Ural Branch of RAS
Russian Federation
Russian Federation
15 Akad. Vonsovsky st., Ekaterinburg 620110
V. N. Puchkov
A.N. Zavaritsky Institute of Geology and Geochemistry, Ural Branch of RAS
Russian Federation
Russian Federation
15 Akad. Vonsovsky st., Ekaterinburg 620110
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Review
For citations:
Prytchin M.E., Soroka E.I., Puchkov V.N. Novel U-Pb isotopic zircon data on the rhyolite of the Saf’yanovskoe Cu-Zn deposit (Middle Urals). LITHOSPHERE (Russia). 2021;21(6):884-893. (In Russ.) https://doi.org/10.24930/1681-9004-2021-21-6-884-893
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