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- Title
The Age of Nb Rare-Metal Mineralization of the Ilmeny-Vishnevogorsky Alkaline Complex (South Urals).
- Authors
Belyatsky, B. V.; Lepekhina, E. N.; Antonov, A. V.; Rodionov, N. V.; Nedosekova, I. L.; Petrov, O. V.; Shevchenko, S. S.; Sergeev, S. A.
- Abstract
The results of local U-Th-Pb-SIMS-SHRIMP-II analysis of the collection of pyrochlores from Nb rare-metal deposits of the Ilmeny-Vishnevogorsky alkaline complex are discussed. Independently of the chemical composition, the host rocks, and the stage of carbonatite formation, the studied pyrochlores are characterized by an almost undisturbed U-Pb isotope system. This allowed to estimate the age of ore mineralization on three deposits (Vishnevogorsky, Buldymsky, and Potaninsky) with an accuracy of ±1-6 m. y. The U-Pb system of the studied pyrochlore samples suggests three epochs of the mineral formation: 380, 230-240, and 216-218 Ma. Convergence of the results obtained by the different methods of U-Pb dating for one of the samples from our collection (±0.5-1.0 Ma) allows to use it as an in-house standard for local dating.
- Subjects
NONFERROUS metals; CARBONATITES; CARBONATE rocks; PYROCHLORE; OXIDE minerals
- Publication
Doklady Earth Sciences, 2018, Vol 481, Issue 2, p1079
- ISSN
1028-334X
- Publication type
Article
- DOI
10.1134/S1028334X18080251