Abstract
The isotopic U‒Th‒Pb age (SIMS (SHRIMP II) and La-ICP-MS) was obtained for accessory zircon from ash tuffs of the Basu and Zigan Formations of the Asha Vendian (Ediacaran) Group of the Southern Urals. The compositions of rare-metal enriched tuffs correspond to rhyolites, comendites, trachytes, and trachyandesites. The concordant value of the U–Pb age of zircon from the tuffs of the Basu Formation is 578 ± 7, 577 ± 7, and 568 ± 5 Ma (SHRIMP II). The age of the zircon from the other two points of the Basu Formation is 573 ± 4 and 574 ± 3 Ma (La-ICP-MS). The age of zircons from the tuffs of the Zigan Formation is 566 ± 5 Ma (SHRIMP II). Tuffs accumulated in the hinterland of the marginal continental volcanic belt.
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This work was carried out under a State Assignment for the Geological Institute, Russian Academy of Sciences, and supported by the Russian Foundation for Basic Research, grant no. 20-05-00308.
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Translated by M. Hannibal
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Ryazantsev, A.V., Razumovskiy, A.A., Novikov, I.A. et al. The Age of Volcanic Tuffs from the Basu and Zigan Formations of the Vendian (Ediacaran) Asha Group in the Southern Urals: Results of U–Th–Pb (SIMS and La-ICP-MS) Dating of Accessory Zircon. Dokl. Earth Sc. 507 (Suppl 2), S278–S286 (2022). https://doi.org/10.1134/S1028334X22601316
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DOI: https://doi.org/10.1134/S1028334X22601316