Abstract—Alkaline and subalkaline granites of the Keivy megablock belong to the potassic alkali-calcic ferroan rocks enriched in large-ion lithophile, high-field strength and rare-earth elements. Based on these criteria, they correspond to A2-type granites (Eby, 1992). The granites have elevated Y/Nb (1.9–2.5) and Yb/Ta (3.4–3.7) ratios typical of crustally derived granites. The initial 176Hf/177Hf ratios in the central parts of zircon crystals vary within 0.281004–0.281175 at εHf(T) ranging from –2.89 to 3.79. It is supposed that the underplating of high-temperature mafic melts caused melting of metasomatically altered lower-crustal rocks and formation of palingenetic lower-crustal melts, which during subsequent ascent in the upper crust experienced fractional crystallization to more siliceous subalkaline and alkaline melts.
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ACKNOWLEDGMENTS
We are grateful to E.A. Belousova (Macquarie University, Sydney, Australia) for the measurement of the Hf isotopic composition of zircon. O.M. Turkina (IGM SO RA, Novosibirsk), A.I. Slabunov (IG KarNTS RAN, Petrozavodsk), and anonymous reviewer are thanked for useful comments.
Funding
The studies were carried out in the framework of the State Task of the Geological Institute of the Kola Science Center (no. 0226-2019-0052 GI), with partial support by the Russian Foundation for Basic Research (project 16-05-00756а) and State Contract no. 13/17-1.
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Vetrin, V.R., Kremenetsky, A.A. Lu–Hf Isotope-Geochemical Zircon Systematics and Genesis of the Neoarchean Alkaline Granites in the Keivy Megablock, Kola Peninsula. Geochem. Int. 58, 624–638 (2020). https://doi.org/10.1134/S0016702920060129
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DOI: https://doi.org/10.1134/S0016702920060129