Abstract
The first data of a U–Pb isotopic study (LA-ICP-MS method) of zircon from leucocratic granites of the giant Tyrnyauz Mo–W deposit (North Caucasus) are presented. The emplacement of this granite separated the formation stages of Mo–W skarns and younger large stockworks with Mo-mineralization. Two types of zircons are distinguished among the grains identified. The first type is represented by rare tabular and short-prismatic crystals (xenocrysts) of an ancient zircon, with large variations of the U–Pb isotopic age (from about 300 Ma to almost 1500 Ma). The second type includes more abundant long-prismatic crystals of a young zircon; its weighted average U–Pb isotopic age (2.67 ± 0.04 Ma) corresponds to the time of leucocratic granite crystallization.
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ACKNOWLEDGMENTS
We are grateful to A.V. Tyshkevich (Central Research Institute of Geological Prospecting for Base and Precious Metals) for the selection and preparation of the zircon grains samples.
Funding
This work was supported by the Ministry of Education and Science of the Russian Federation (project no. 075-15-2020-802).
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Translated by L. Mukhortova
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Soloviev, S.G., Kryazhev, S.G., Semenova, D.V. et al. First Data on the U–Pb Isotopic Age for Zircon (LA-ICP-MS Method) from Leucocratic Granites of the Tyrnyauz Mo–W Deposit (North Caucasus, Russia). Dokl. Earth Sc. 498, 471–476 (2021). https://doi.org/10.1134/S1028334X21060155
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DOI: https://doi.org/10.1134/S1028334X21060155