Abstract
The Kola geotectonic province in the northeastern Fennoscandian Shield accommodates a significant number of alkaline rock massifs differing in age. They are of mantle and mantle-crustal origin (alkali and nepheline syenites, carbonatites) and related to crustal sources (Neoarchean alkali granites). Among them, the Neoarchean Sakharjok nepheline syenite massif is related to the oldest intrusions of this kind bearing yttrium-zirconium mineralization. The crystallization of alkali syenite pertaining to the first intrusive phase of the intrusive Sakharjok massif is dated to 2645 ± 7 Ma, and this implies that this syenite postdated alkali granites (2.66–2.67 Ga). To date the yttrium-zirconium ore, we applied the local U-Pb method to zircon crystals occurring in the mineralized block hosted in nepheline syenite. The earliest fragments of zircon crystallized 1832 ± 7 Ma ago; the age of metamorphism is estimated at 1784 ± 13 Ma. These dates indicate the Paleoproterozoic age of the yttrium-zirconium mineralization, which was formed as a product of fluid reworking of the Neoarchean nepheline syenite of the Sakharjok massif.
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Original Russian Text © V.R. Vetrin, S.G. Skublov, Yu.A. Balashov, L.M. Lyalina, N.V. Rodionov, 2014, published in Zapiski Rossiiskogo Mineralogicheskogo Obshchestva, 2014, No. 2, pp. 1–22.
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Vetrin, V.R., Skublov, S.G., Balashov, Y.A. et al. Time of formation and genesis of yttrium-zirconium mineralization in the Sakharjok massif, Kola Peninsula. Geol. Ore Deposits 56, 603–616 (2014). https://doi.org/10.1134/S107570151408011X
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DOI: https://doi.org/10.1134/S107570151408011X