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Isotopic-Geochemical Systematics (Sm–Nd, Lu–Hf) of Neoarchean Subalkaline and Alkaline Rocks of the Keivy Structure (Kola Peninsula): Their Age and Genetic Relations

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Abstract

The Neoarchean subalkaline magmatism of the Keivy structure is expressed in the formation of the volcanoplutonic latite–monzonite–granite association (LMGA). The formation of LMGA magmas is assumed to occur due to melting of metasomatically altered mafic rocks during intrusion into the lower crust of basaltic melts initial for rocks of the dike complex and gabbro–labradorite massifs. The alkaline granites associated with LMGA have a close U–Pb age but a later formation time based on the geological data. With respect to LMGA, alkali granites have increased concentrations of SiO2, alkalis (K2O/Na2O = 1.1–1.4), iron (F# = 84–98%), a high agpaitic index (Kagp = 0.86–1.2), and lower quantities of TiO2, MgO, Fetot, and Al2O3, which probably resulted from the higher degree of differentiation of their initial melts compared to LMGA.

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ACKNOWLEDGMENTS

The authors are grateful to E.A. Belousova (Macquarie University, Sydney, Australia) and A.A. Kremenetskii (Institute of Mineralogy, Geochemistry, and Crystal Chemistry of Rare Earth Elements, Moscow) for Hf isotope analyses of zircon.

Funding

The research was finaced by the Russian Foundation for Basic Research (project nos. 17-35-50002, 16-05-00026а), state contract no. 13/17-1 (compilation of a set of multi- and polyelement geochemical maps of the Russian Sector of the Artic adjacent water areas, and territories on a scale of 1 : 2 500 000).

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  1. Geological Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia

    V. R. Vetrin

  2. Institute of Mineralogy, Geochemistry, and Crystal Chemistry of Rare Elements, Moscow, Russia

    V. R. Vetrin

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Vetrin, V.R. Isotopic-Geochemical Systematics (Sm–Nd, Lu–Hf) of Neoarchean Subalkaline and Alkaline Rocks of the Keivy Structure (Kola Peninsula): Their Age and Genetic Relations. Geol. Ore Deposits 61, 581–588 (2019). https://doi.org/10.1134/S1075701519070146

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