Abstract
The formation of granitoids of increased basicity and rocks of basitic composition on the Eastern slope of the Urals in the early Permian requires a reliable justification by geochronological data. U-Pb and Lu–Hf isotope systems in zircons separated from fine-grained granite of the Nepluyevsky pluton as well as Hf–Nd systematics of the rock were studied using LA-ICP-MS. Zircon LA-ICP-MS dating and the analysis of its Lu–Hf isotope system were performed using two mass spectrometers - quadrupole NexION 300S and multi-collector Neptune Plus and NWR 213 laser ablation system. The results of U-Pb dating for similar areas of NP-47 zircon grains by LA-ICP-MS and SHRIMP techniques are in satisfactory agreement. A difference in the age of zircons of different morphotypes was established: for the first type with a pronounced rhythmic zonation, a concordant U-Pb age was 360 ± 2 Ma (1σ, n = 19, SHRIMP- II) and 368 ± 6 Ma (1σ, n = 7, LA-ICP-MS); for the second type (“amoeboid-shaped” cores with “spotted” zoning), the concordant age was 430 ± 9 Ma (1σ, n = 1, SHRIMP-II). The comparison of the resulting isotopic Sm–Nd and Lu–Hf data suggests the xenogeneic, non-magmatic nature of the zircons contained in the rock, for which an older Silurian zircon of the second type could serve as a seed for growth. The age of the latter significantly exceeds the age of the Early Carboniferous rocks of the main phases of the pluton, broken by fine-grained granite.
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Acknowledgment
The work was carried out at the UB RAS “Geoanalitik” Center for Collective Use within the state assignment of FASO of Russia (theme No. 0393-2016-020); the results of section “U-Pb-dating and analysis of the Lu–Hf-isotope system of zircons” were obtained within the RSF grant (project No. 16-17-10283); the results of section “Materials and methods” were obtained within the RFBR grant (project No. 17-05-00618).
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Osipova, T.A., Zaitceva, M.V., Votyakov, S. (2020). U–Pb Age and Analysis of the Lu–Hf Isotope System of Zircon from Granitoids of the Final Phases of the Nepluyevsky Pluton (The Southern Urals). In: Votyakov, S., Kiseleva, D., Grokhovsky, V., Shchapova, Y. (eds) Minerals: Structure, Properties, Methods of Investigation. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-00925-0_24
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