Abstract
The results of the interpretation of the magnetotelluric sounding data obtained in the Southern Ladoga region are presented. When performing 3D inversion, both new data obtained by the LADOGA working group in 2018–2021 and data from the 1-EV profile (the “Loop” segment) carried out in the early 2000s were used. Based on the results of automatic inversion carried out with a help of ModEM program (Egbert and Kelbert), a 3D geoelectric model of the Earth’s crust to a depth of 60 km has been constructed, which demonstrates the complex inhomogeneous structure of the studied territory. Two anomalous zones of crustal electrical conductivity oriented SE and NE are distinguished in the geoelectric model; the first one is a continuation of the well-known Ladoga anomaly. The presence of the second conductive structure confirms the results of the single-site magnetovariational soundings performed by I.I. Rokityansky in the several segments of the East European Platform in the early 1980s.
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REFERENCES
Aleksanova, E.D., Kulikov, V.A., Pushkarev, P.Yu., and Yakovlev, A.G., Using the fields of electrified railways for electromagnetic sounding, Izv. Vyssh. Uchebn. Razved., Geol. Razved., 2003, no. 4, pp. 60–64.
Berzin, R.G., Kulikov, V.A., and Kaplan, S.A., Construction of a geoelectric section of the Earth’s crust based on MT data in the Tikhvin–Molokovo section of 1-EB profile, in Pyatye geofiz. ch. im. V.V. Fedynskogo (Abstr. 5th Fedynsky Geophys. Readings), Moscow: GEOS, 2003 [in Russian].
Egbert, G.D. and Kelbert, A., Computational recipes for electromagnetic inverse problems, Geophys. J. Int., 2012, vol. 189, pp. 167–251.
Feldman, I.S. and Erinchek, Yu.M., Geoelectric model of the Earth’s crust along the I-EB profile (Baltic Shield–Caspian syneclise), in Mater. Vseross. shkoly-seminara po elektromagnitnym issledovaniyam Zemli (Proc. IV All-Russ. School-Seminar on Electromagnetic Earth Sounding), Moscow, 2009.
Kelbert, A., Meqbel, N., Egbert, G.D., and Tandon, K., ModEM: a modular system for inversion of electromagnetic geophysical data, Comp. Geosci., 2014, vol. 66, pp. 40–53.
Kovtun, A.A., Vagin, S.A., Vardanyants, I.L., et al., The structure of the crust and mantle along the Suoyarvi–Vyborg profile from magnetotelluric data, Vestn. St.-Peterb. Univ., Ser. Fiz. Khim., 1998, vol. 4, pp. 25–34.
Kovtun, A.A., Vardanyants, I.L., and Uspenskii, N.I., Comparison of seismic and geoelectric models of the Ladoga–Bothnia anomalous zone, Vopr. Geofiz., 2011, no. 44, pp. 124–133.
Kulikov, V.A., Sokolova, E.Yu., Desyatov, D.O., et al., New MTZ-GMTZ data on the Kirishi-Podporozhye profile 2018, in Tez. Mezhd. geol.-geofiz. konf. i vystavki “GeoEvraziya-2019. Sovremennye tekhnologii izucheniya i osvoeniya nedr Evrazii” (Proc. Int. Geol. Geophys. Conf. and Exhibition “GeoEurasia-2019: Modern Technologies for Studying and Developing the Subsoil of Eurasia”), Moscow, PoliPRESS, 2019, pp. 446–452.
Kulikov, V.A., Sokolova, E.Y., Ionicheva, A.P., et al., Electrical conductivity of the basement of East European Platform in the southeastern Ladoga Region from magnetotelluric data, Izv., Phys. Solid Earth, 2020, vol. 56, no. 6, pp. 789–807.
Kulikov, V.A., Ionicheva, A.P., Korol’kova, A.V., et al., Analysis of magnetotelluric data form the Southern Ladoga Region, in Tr. IV Mezhd. geol.-geofiz. konf. i vystavki “GeoEvraziya-2021. Geologorazvedka v sovremennykh realiyakh” T. I (Proc. IV Int. Geol. Geophys. Conf. and Exhibition “GeoEurasia-2021: Geological Exploration in Modern Realities”), Tver: OOO “PoliPRESS,” 2021.
Mints, M.V. and Sokolova, E.Yu. (LADOGA Collab.), 3D model of the deep structure of the Svecofennian accretionary orogen based on data from CDP seismic reflection method, MT sounding and density modeling, Tr. Karel. Nauchn. Tsentra RAN, Ser. Geol. Dokembriya, 2018, no. 2, pp. 34–61.
Mints, M.V., Suleimanov, A.K., Babayants, P.S., et al., Glubinnoe stroenie, evolyutsiya i poleznye iskopaemye rannedokembriiskogo fundamenta Vostochno-Evropeiskoi platformy: Interpretatsiya materialov po opornomu profilyu 1-EV, profilyam 4V i Tatseis. V 2-kh t (Deep Structure, Evolution, and Minerals of the Early Precambrian Basement of the East European Platform: Interpretation of Materials on Reference Profile 1-EB, Profiles 4B and Tatseis. Vols. 1–2), Moscow: Geokart, GEOS, 2010 [in Russian].
Rokityansky, I.I., Kulik, S.N., and Rokityanskaya, D.A., Ladoga electrical conductivity anomaly, Geofiz. Zh., 1981, no. 3, pp. 97–99.
Rokityansky, I.I., Kulik, S.N., Logvinov, I.M., and Rokityanskaya, D.A., Geomagnetic anomalies in the northwest of the European USSR, Fiz. Zemli, 1982, no. 11, pp. 101–106.
Sokolova, E.Yu., Golubtsova, N.S., Kovtun, A.A., et al., Results of synchronous magnetotelluric and magnetovariational soundings in the region of Ladoga conductivity anomaly, Geofizika, 2016, no. 1, pp. 48–61.
Sokolova, E.Yu., Mints, M.V., Golubtsova, N.S., et al., Deep models of the Ladoga electrical conductivity anomaly based on the results of synchronous MT-MV sounding along the Vyborg-Suoyarvi profile and in the southeastern Ladoga region, in Ladozhskaya proterozoiskaya struktura (geologiya, glubinnoe stroenie i minerageniya) (The Proterozoic Ladoga Structure: Geology, Deep Structure, and Minerageny), Sharov, N.V., Ed., Petrozavodsk: KarNTs RAN, 2019, pp. 284–302.
Stepanov, K., Antashchuk, K., and Saraev, A., Clarifi cation of Pasha Rift Structure in Pasha-Ladoga Basin Based on AMT and Gravity Data, Geophysica, 2016, vol. 51, no. 1, pp. 51–67.
Zhamaletdinov, A.A., Kolesnikov, V.E., Skorokhodov, A.A., et al., Results of electric profiling using direct current in combination with amt sounding along the profile across the Lake Ladoga anomaly, Tr. Karel. Nauchn. Tsentra RAN, Ser. Geol. Dokembriya, 2018, no. 2, pp. 91–110.
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Kulikov, V.A., Ionicheva, A.P., Korol’kova, A.V. et al. 3D Inversion of Magnetotelluric Sounding Data in the Southern Ladoga Region. Moscow Univ. Geol. Bull. 77, 138–146 (2022). https://doi.org/10.3103/S0145875222010082
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DOI: https://doi.org/10.3103/S0145875222010082