Weitere Kapitel dieses Buchs durch Wischen aufrufen
DC electrical profiling with the use of Method of External Sliding Dipole (MESD) has been made along the profile Sevastyanovo-Hijtola-Sujstamo of 200 km length. The profile crosses the Ladoga anomaly of high conductivity. Interpretation of MESD results is performed in two stages. At the first stage, a one-dimensional inverse problem is solved using the Zohdy procedure (Zohdy 1989). The starting model is set in the form of a multilayered section with the number of layers equal to the number of deletions from the feeding line plus one (first) layer for the results of measurements inside the line. The depths to the base of the layers and their resistivity are taken equal to the corresponding values of the effective distances and to the apparent resistivity at corresponding distance. Further, an iterative selection of the theoretical model of the medium occurs before obtaining agreement with the experimental data within the error of observations. At the second stage, a quasi-2D section is constructed by symmetrically shifting the deep sounding centers with relation to the supply line AB to the southwest and northeast as the receiving dipoles MN move in opposite directions. The results of profiling, as well as the results of the study of samples from outcrops and boreholes, indicate the connection of anomalies with the presence of electron-conducting sulphide-carbonaceous rocks. Obviously, they explain the nature of the upper part of the regional Ladoga conductivity anomaly.
Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten
Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:
Adam A., Kaikkonen P., Hjelt S.E., Pajunpaa K., Szarka L.,Vero J., Wallner A. (1982) Magnetotelluric and audiomagnetotellurics measurements in Finland. Tectonophysics 90, 77–90. CrossRef
Kaminsky A.E. (2010). ZondRes2D. Software for two-dimensional interpretation of DC re-sistivity and IP data. Zond Geophysical Software, Saint-Petersburg (Russia). 139 p.
Kolesnikov V.E. (2016). Multi-electrode electrical exploration using the internal sliding contact technique - the experience of numerical 2D modeling. Seismic equipment 52 (3), 27–34.
Kovtun A.A. (1989). The structure of the crust and upper mantle in the northwest of the East European Platform based on magnetotelluric sounding data. Leningrad University, Leningrad (USSR). 284 p.
Kovtun A.A., Vardaniants I.L., Legenkova N.P., Smirnov M.Yu., Uspensky N.I. (2004). Features of the structure of the Karelian region according to geoelectric studies. Deep struc-ture and seismicity of the Karelo-Kola region and its surroundings. (edited by Sharov, N.V.).Karelian Science Center of RAS, Petrozavodsk (Russia). pp. 102–130.
Lazareva N.V. (1967). Some features of natural electromagnetic field behaviour on the southern slope of the Baltic Shield. Issues of exploration geophysics 6. Nedra, Leningrad (USSR).
Rokityansky I. I., Vasin N. D., Golod M. I., Novitsky G. P., Rokityanskaya D. A., Soko-lov S.Ya. (1979). Anomalies of electrical conductivity in the south of Karelia. Geophysical collection 89. Naukova dumka, Kiev (USSR). pp. 36–39.
Sokolova E. Yu., Golubtsova N. S., Kovtun A. A. et al. (2016). Results of synchronous magnetotelluric and magnetovariational soundings in the area of the Ladoga electrical con-ductivity anomaly. Geophysics 1. pp. 48–61.
Sviridenko L. P., Isanina E. V., Sharov N. V. (2017). The deep structure, volcanoplutonism and tectonics of the Ladoga area. Proceedings of the Karelian Research Center of RAS 2. Pe-trozavodsk (Russia). pp. 73–85.
Vasin N.D. (1988). Geoelectric characteristics of the section of southwestern Karelia. Notes of Mining Institute. 113. pp. 57–63.
Zhamaletdinov A.A., Ronning J.S., Vinogradov Yu.A. (1995). Electrical profiling by the MISC and Slingram methods in the Pechenga-Pasvik area. Norges Geologiske Undersokelse, Special publication 7. pp. 333–338.
Zhamaletdinov A.A. (2012). Theory and methodology of deep electromagnetic soundings with powerful controlled sources (the experience of critical analysis). SPbSU, Saint-Petersburg (Russia). 163 p.
Zohdy A.A.R. (1989). A new method for the automatic interpretation of Schlumberger and Wenner sounding curves. Geophysics 54 (2), 245–253. CrossRef
- Multi-Electrode Electrical Profiling Results in the Northern Ladoga Area
V. E. Kolesnikov
M. Yu. Nilov
A. A. Zhamaletdinov
- Chapter 37