New data on the age of Ta-Nb mineralization from the Uuksu rare-metal-granite dike complex (Salmi batholith, Karelia)

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Abstract

This work presents new data on rare-metal topaz-“zinnwaldite” granite dikes of the Salmi anorthosite-rapakivigranite complex of rocks. The isotopic age of Ta–Nb mineralization: the columbite-(Fe) – tantalite-(Fe) series and tapiolite was determined by the U–Pb method (ID-TIMS, 1541±2.5 Ma). Conclusions are given about the age limitations of the associated rocks, intersected by similar dikes, and the discreteness of the rare-metal magmatism manifestation in the studied area.

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About the authors

A. A. Konyshev

Karelian Scientific Center, Russian Academy of Sciences

Author for correspondence.
Email: icelopa@gmail.com

Institute of Geology

Russian Federation, Petrozavodsk

N. G. Rizvanova

Institute of Geology and Geochronology of the Precambrian, Russian Academy of Sciences

Email: icelopa@gmail.com
Russian Federation, St. Petersburg

N. A. Sergeeva

Institute of Geology and Geochronology of the Precambrian, Russian Academy of Sciences

Email: icelopa@gmail.com
Russian Federation, St. Petersburg

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Supplementary files

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2. Fig. 1. Images of typical grains of the series columbite-(Fe) – tantalite-(Fe) (a) and tapiolite (b), back-scattered electrons.

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3. Fig. 2. Discrimination diagram for minerals of the columbite–tantalite–tapiolite series according to [15]. Circles – tapiolite, squares – tantalite, diamonds – columbite. Unfilled symbols – average compositions obtained for the inner and outer zones of the grain in Fig. 1a.

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4. Fig. 3. Concordia diagram for tantalum niobates from sample AK310820-3.

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