Abstract—
The results of magnetotelluric soundings obtained in 2020 along the Rzhev–Velikie Luki profile in the suture zone of three segments of the Precambrian crust of the East European Platform: Fennoscandia, Sarmatia, and Volga-Ural are presented. An anomaly zone of increased conductivity in the crust was revealed in the central part of the profile. The crust conductor is weakly expressed on the components of the telluric tensor due to the screening effect of the conducting sedimentary cover; therefore, the main emphasis in the qualitative analysis of the data and inversion is placed on magnetovariation parameters. According to the results of 2D inversion carried out in A.E. Kaminsky’s ZONDMY2D program, a subvertical zone of low resistivity has been identified on the geoelectric model in the crust, which is assumed to be associated with a paleosubduction zone of the Belarusian Oceanic Plate.
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REFERENCES
Bogdanova, S.V., Pashkevich, I.K., Gorbatschev, R., and Orlyuk, M., Riphean rifting and major Palaeoproterozoic boundaries in the East European craton: geology and geophysics, Tectonophysics, 1996, vol. 268, pp. 1–22.
Bogdanova, S.V., Bibikova, E.V., Postnikov, A.V., and Taran, L.N., Early Proterozoic magmatic belt of the Moscow Region, Dokl. Ross. Akad. Nauk, 2004, vol. 395, no. 3, pp. 376–380.
Bogdanova, S.V., Gorbatschev, R., and Garetsky, R.G., EUROPE. East European Craton, in Reference Module in Earth Systems and Environmental Sciences, Elsevier, 2016, pp. 1–18.
Erinchek, Y.M. and Milshtein, E.D., The Middle Russian transplatform palaeorift system, Dokl. Russ. Acad. Sci., 1993, vol. 329, no. 1, pp. 82–86.
Garetskii, R.G. and Karataev, G.I., Shovnye zony Fennoskandii, Sarmatii i Volgo-Uralii (Suture Zones in Fennoscandia, Sarmatia, and Volga–Urals), Minsk: Belarus. Navuka, 2014.
Garetskii, R.G. and Leonov, M.G., Pool structures: A new type of interaction zones of lithospheric plate flows, Dokl. Earth Sci., 2018, vol. 478, no. 2, pp. 152–155.
Gorbatschev, R. and Bogdanova, S., Frontiers in the Baltic Shield, Precambrian Res., 1993, vol. 64, pp. 3–21.
Kulikov, V.A., Aleksanova, E.D., Varentsov, I.M., et al., Resistivity image of Baryatinskaya crustal high-conductive anomaly based on the results of areal MT-survey, Geofizika, 2018, no. 1, pp. 31–43.
Tsyganov, V.A., Geological and tectonic structure of the upper crystalline basement of the central East European Platform and its reflection in the upper sedimentary cover, Georesources, 2002, no. 1 (6), pp. 11–15.
Varentsov, I.M., Kovachikova, S., Kulikov, V.A., et al., Crustal conductivity anomalies on the western slope of the Voronezh anteclise, in Mater. mezhd. konf. pamyati V.E. Khaina “Sovremennoe sostoyanie nauk o Zemle” (Proc. Int. Conf. Devoted to memory of V.E. Khain “The Current State of the Earth’s Sciences”), Moscow, 2011, pp. 290–295.
Varentsov, I.M., Ivanov, P.V., Kolodyazhnyi, S.Yu., et al., Investigation of electrical conductivity anomalies in the conjunction area of the largest segments of the East European Platform by MT/MV sounding data, in Mater. 47-i sess. Mezhd. nauch. sem. D.G. Uspenskogo–V.N. Strakhova “Voprosy teorii i praktiki geologicheskoi interpretatsii geofizicheskikh polei” (Proc. 47 Sess. Int. Sci. Workshop of D.G. Uspensky and V.N. Strakhov “Problems of Theory and Practice in the Geological Interpretation of Geophysical Fields”), Voronezh: Izd.-Poligraf. Tsentr “Nauchn. Kniga, Voronezh,” 2020, pp. 52–56.
Wybraniec, S., Zhou, S., Thybo, H., et al., New map compiled of Europe’s gravity field. EOS Transactions, Amer. Geophys. Union, 1998, vol. 79, pp. 437–442.
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Kulikov, V.A., Ionicheva, A.P., Lubnina, N.V. et al. New Magnetotelluric Data for the Fennoscandia–Sarmatia Suture Zone. Moscow Univ. Geol. Bull. 76, 239–246 (2021). https://doi.org/10.3103/S0145875221030066
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DOI: https://doi.org/10.3103/S0145875221030066