Abstract
Neoarchean intraplate granitoid (2.61 Ga) and carbonatite magmatism are established in the Kursk block of Sarmatia in close spatial association. Alkaline pyroxenites, carbonatites, and syenites of the Dubravinskii complex are represented by two relatively large intrusions and a few small plutons. They underwent amphibolite facies metamorphism at about 2.07 Ga. The age of alkaline-carbonatite magmatism is 2.59 Ga according to SIMS isotope dating of zircon from syenites. The close age and spatial conjugation allow the Dubravinskii carbonatite complex to be considered to have formed in intraplate conditions. The mantle plume upwelling caused metasomatic alteration and consequent partial melting of the sublithospheric mantle and intrusion of enriched magmas into the crust. Contamination of alkaline mantle melts in the crust by Archean TTGs caused the formation of syenites melts in the form of dykes that cutting through pyroxenites and carbonatites.
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ACKNOWLEDGMENTS
The authors are grateful to Corresponding Member of the RAS A.B. Kotov (Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences) for constructive comments, which significantly improved this article.
Funding
This work was supported by the Russian Foundation for Basic Research, project no. 19-05-00159, and a State Assignment of the Laboratory of Petrography, Institute of the Geology of Ore Deposits, Russian Academy of Sciences.
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Translated by M.S. Nickolsky
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Savko, K.A., Tsybulyaev, S.V., Samsonov, A.V. et al. Archean Carbonatites and Alkaline Rocks of the Kursk Block, Sarmatia: Age and Geodynamic Setting. Dokl. Earth Sc. 498, 412–417 (2021). https://doi.org/10.1134/S1028334X21050160
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DOI: https://doi.org/10.1134/S1028334X21050160