New data on the trace element composition and Lu-Hf isotopic system of zircons from the Early Cambrian granites of the Ufaley block (Middle Urals): a step to the correction of geodynamic concepts
https://doi.org/10.24930/1681-9004-2022-22-1-55-74
Abstract
Research subject. Composition and isotopic parameters of zircons and their host granites of the Bitim complex, localised in the eastern part of the Ufaley block (Middle Urals).
Materials and methods. The determination of trace element composition and Lu-Hf isotope system in zircons was carried out by LA-ICP-MS (the “Geoanalitik” shared research facilities of the IGG UB RAS, Ekaterinburg).
Results and conclusions. The images and geochemical features of the main zircon population from granites confirm their magmatic genesis and minimal alteration, which proves previously defined Vendian- Cambrian (520 ± 9 Ma) age for the granites. Younger zircons (401–459 Ma) differing in composition from the older ones, were formed during subsequent tectonic-thermal activity, possibly under the fluid action. The mixed mantle-crustal nature of substrate for the granite melting is indicated by specific isotopic parameters (87Sr/86Sr = 0.703389, εHf(t)aver = +6.3) and a number of characteristic ratios for zircons and granites. The geodynamic concepts of the granite formation settings of the Bitim complex are corrected: in the Vendian–Early Cambrian, a transform-type margin has developed in this sector, the divergent movements on which have been accompanied by a break in the continuity of the crust and the intrusion of a deep mantle diapir; the participation of the slab substance in the magma generation might also be assumed.
Conclusions. The results obtained can be used for the geological mapping and correction of a general geodynamic scheme for the junction zone between the Ural Mobile Belt and the East European platform.
Keywords
continental margin,
transform processes,
plume-dependent series,
Ural Mobile belt,
East European platform,
granites,
zircons,
geochemistry,
geodynamics,
substrate
Supporting agencies: The studies were carried out as part of the IGG UB RAS state assignment (state registration No. AAAA-A18-118052590029-6), using the “Geoanalitik” shared research facilities of the IGG UB RAS. The re-equipment and comprehensive development of the “Geoanalitik” shared research facilities of the IGG UB RAS 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 Author
G. Yu. Shardakova
A.N. Zavaritsky Institute of Geology and Geochemistry, Urals Branch of RAS
Russian Federation
Russian Federation
15 Akad. Vonsovsky st., Еkaterinburg 620016
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For citations:
Shardakova G.Yu. New data on the trace element composition and Lu-Hf isotopic system of zircons from the Early Cambrian granites of the Ufaley block (Middle Urals): a step to the correction of geodynamic concepts. LITHOSPHERE (Russia). 2022;22(1):55–74. (In Russ.) https://doi.org/10.24930/1681-9004-2022-22-1-55-74
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