New Data on the Age of Ta–Nb Mineralization from the Uuksu Rare-Metal-Granite Dike Complex, (Salmi Batholith, Karelia).

New data on dikes of rare metal topaz–"zinnwaldite" granites of the Salmi anorthosite–rapakivigranite complex are presented. The U–Pb (ID-TIMS) isotopic age of Ta–Nb mineralization: the columbite-(Fe)–tantalite-(Fe) series and tapiolite is 1541 ± 2.5 Ma. Conclusions are given on the age limitations of associated rocks, intersected by analogous dikes, and the discreteness of the rare-metal magmatism manifestation in the studied area. [ABSTRACT FROM AUTHOR]