Geoelectric model of the Earth’s crust and upper mantle of the Dniester-Bug megablock of the Ukrainian Shield
Keywords:Earth’s crust, upper mantle, Ukrainian Shield, electrical conductivity
A network of long-period magnetotelluric and magnetovariational data (124 sites) in the period range of 9—16 to 2500—6400 s made it possible to explore the geoelectric structure of the Erth’s crust and upper mantle of most of the Dniester-Bug and adjacent megablocks of the Ukrainian shield. Based on the resistivity cross-sections along the profiles (with 2D inversion), a three-dimensional matrix was created for the territory limited by coordinates 27.7—30.4° E and 47.7—49.4° N, which included the spatial coordinates of each grid node on each profile, the power of the model cells, and the resistance value in the cell. As a result, geoelectrical anomalous structures were identified at different depths from 3 to 100 km.
The entire block of rocks 200×200 km down to a depth of 100 km is characterized by high resistivity, against which objects of reduced resistivity (LRO) are identified.
The resulting distribution of high-resistivity rocks over the entire depth of the model is in good agreement with the laboratory dependencies obtained both for the rocks of the Ukrainian Shield and other data. Model data show a significant difference in resistivities in the upper 14—16 km (above 105 ohm), lower crust (about 104 ohm), and upper mantle (103 ohm). Against a general decrease in resistance with depth in the Earth’s crust, three regions were identified in which anomalously high (for a given depth) resistances extend to the entire thickness of the crust. These high-resistivity objects are consistent with positive Bouguer anomalies.
Against the background of high-resistivity rocks, LROs stand out, the resistance of which does not exceed 120 ohm·m. The spatial dimensions of the LRO zones indicate their locality and do not form a continuous layer. An analysis of the distribution of LROs in space and depth suggests a genetic relationship between mantle LROs and crustal LROs. Comparison of mantle LROs with the Beltska zone of modern activation on the territory of Ukraine shows their good agreement both vertically and horizontally. To explain the lower LRO resistivity in the upper mantle, overheating of the rocks to solidus and 2—3 % melting and/or the presence of fluids is necessary [Gordienko, 2017]. In recent studies discussing the influence of thermobaric conditions and the fluid content necessary to explain the presence of increased conductivity in the upper mantle, the authors of [Blatter et al., 2022] concluded that an anomalously large amount of volatiles is needed with small amounts of melt. The assumption that mantle LROs are related to crustal LROs has been tested by comparing LROs with fault zones.
The presence of LROs in the mantle, their vertical extent, and their connection with rejuvenated fault systems can serve as a basis for the deep migration of fluids enriched in volatiles.
Blatter, D., Naif, S., Key, K., & Ray, A. (2022). A plume origin for hydrous melt at the lithosphere-asthenosphere boundary. Nature, 604, 491—494. https://doi.org/10.1038/s41586-022-044483-w.
Burakhovich, T.K., Gordienko, I.V., Kulik, S.N., Logvinov, I.M., & Tarasov, V.P. (1997). Mag¬netotelluric studies of zones of young activization of the tectonosphere in the northern part of the Moldavian plate. Geofizicheskiy Zhurnal, 19(5), 44—49 (in Russian).
Dai, L, Hu, H., Jiang, J., & Sun, W. (2020). An Overview of the Experimental Studies on the Electrical Conductivity of Major Minerals in the Upper Mantle and Transition Zone. Materials, 13, 408. https://doi.org/10.3390/ma13020408.
Entin, V.A. (2005). Geophysical basis of the tectonic map of Ukraine at a scale of 1:1 000 000. Geofizicheskiy Zhurnal, 25(1), 74—88 (in Ukrainian).
Gordienko, V.V. (2001). Nature of crustal and mantle conductors. Geofizicheskiy Zhurnal, 23(1), 29—39 (in Russian).
Gordienko, V.V., Gordienko, I.V., Zav¬go¬rod¬nyaya, O.V., Kovachikova, S., Logvinov, I.M., Tarasov, V.N. & Usenko, O.V. (2012) Volyn-Podolyan plate (Geophysics, deepprocesses). Kiev: Naukova Dumka, 198 p. (in Russian).
Gordienko, V.V. (2021). On the circulation of hydrogen in the atmosphere and the Earth’s crust. Geofizicheskiy Zhurnal, 43(5), 35—59. https://doi.org/10.24028/gzh.v43i5.244051 (in Russian).
Gordienko, V.V. (2017). Thermal processes, geodynamics, deposits. 283 p. Retrieved from https://docs.wixstatic.com/ugd/6d9890_c2445800a51b49adb03b8f949f3d6abb.pdf.
Gordienko, V.V., Gordienko, I.V., Gordienko, L.Ya., Zavgorodnyaya, O.V., Logvinov, I.M., & Tarasov, V.N. (2020). Zones of recent activation of Ukraine. Geofizicheskiy Zhurnal, 42(2), 29—52. https://doi.org/10.24028/gzh.0203-3100.v42i2.2020.201740 (in Russian).
Gordienko, V.V., Gordienko, I.V., Zavgo¬rod¬nyaya, O.V., Kovachikova, S., Logvinov, I.M., Ta¬rasov, V.N., & Usenko, O.V. (2005). Ukrainian Shield (Geophysics, deepprocesses). Kiev: Korvin Press, 210 p. (in Russian).
Gurskiy, D.S., & Kruglov, S.S. (Eds.). (2007). Tectonic map of Ukraine M 1:1 000 000. Kiev: UkrDGRI (in Ukrainian).
Ilchenko, T.V. (2002). Results of SEISMIC surveys along the Eurobridge-97 transept. Geofizicheskiy Zhurnal, 14(3), 36—50 (in Russian).
Karato, S. (2006). Influence of Hydrogen-Related Defects on the electrical conductivity and plastic deformation of mantle minerals: A Critical Review. In S.D. Jacobsen, S. Van Der Lee (Eds.), Earths Deep Water Cycle (Vol. 168, pp. 113—129). https://doi.org/10.1029/168GM09.
Karato, S. (1990). The role of hydrogen in the electrical conductivity of the upper mantle. Nature, 347, 272—273. https://doi.org/10.1038/ 347272A0.
Kharitonov, O.M., Omelchenko, V.D., Dro¬git¬skaya, G.M., & Kutas, V.V. (1995). The lithospheric transaction Bucharest-Chernobyl. Dok¬lady NAN Ukraine, (5), 84—87 (in Russian).
Kovachikova, S., Logvinov, I., & Tarasov, V. (2022). Area-wide 2D and quasi-3D geoelectric models of the Earth’s crust and upper mantle as a possible evidence of recent tectonic activity in the western part of the Ukrainian Shield. Geodynamics, (1), 99—118. https://doi.org/ 10.23939/jgd2022.02.099.
Ladanivskiy, B.T. (2003). Algorithm for processing MTZ data. Fifth geophysical readings named after V.V. Fedynsky February 27 ¾ March 01, 2003. Abstracts of reports (pp. 134—135) (in Russian).
Ladanivskyy, B., Logvinov, I., & Tarasov, V.(2019). Earth mantle conductivity beneath the Ukrainian territory. Studia Geophysica et Geodaetica, 63(2), 290—303. https://doi.org/ 10.1007/sl1200-018-00347-4.
Laumonier, M., Blundy, J., Gaillard, F., Muir, D., & Unsworth, M.J. (2017). Giant magmatic water reservoirs at mid-crustal depth inferred from electrical conductivity and the growth of the continental crust. Earth and Planetary Science Letters, 457, 173—180. http://dx.doi.org/10.1016/j.epsl.2016.10.023.
Logvinov, I.M. (2015). Deep Geoelectric Structure of the Central and Western Ukraine. Acta Geophysica, 63(5), 1216—1230. https://doi.org/10.1515/acgeo-2015-0049.
Logvinov, I.M., & Tarasov, V.N. (2019). Electrical conductivity of the crust and mantle of the East European platform in the western part of Ukraine from area-wide 2D models. Geofizicheskiy Zhurnal, 41(1), 44—75. https://doi.org/1024028/gzh0203-3100.v.41i1.2019.158863 (in Russian).
Maltsev, K.A., & Mukharamova, S.S. (2014). Building models of spatial variables (with using the Surfer package). Kazan: Edition of the Kazan University, 103 p. (in Russian).
Manning, C. (2018). Fluids of the Lower Crust: Deep Is Different. Annual Review of Earth and Planetary Sciences, 45, 67—97. https://doi.org/ 10.1146/annurev-earth-060614-105224.
National Atlas of Ukraine. (2007). Kyiv: Carto¬gra¬phy, 440 p. (in Ukrainian).
Orluk, M.I. (2000). Spatial and spatio-temporal magnetic models of different-ranked structures of the lithosphere of the continental type. Geofizicheskiy Zhurnal, 22(6), 148—165 (in Russian).
Rika, V., & Malyshevskiy, A. (1989). Petrographic Dictionary. Moscow: Nedra, 590 p. (in Russian).
Scientific Report. The project «The geomagnetic field under the heliospheric forcing. Deter¬mi¬nation of the internalstructure of the Earth and evaluation of the geophysical hazard produ¬ced by solar eruptive phenomena». (2013). Program IDEI, Contract 93/5.10.2011, Stage I—III. In¬sti¬tute of Geodynamics Romanian Aca¬de¬my, 28 p. Retrieved from http://www.geodin.ro/IDEI2011/engl/index.html.
Shcherbak, M.P., & Bobrov, O.D. (Eds.). (2006). Mineral deposits of Ukraine. V. I. Metalliferous mineral deposits. Kyiv-Lviv: «Center of Europe» Publishing House, 739 p. (in Ukrainian).
Shcherbakov, I.B. (2005). Petrology of the Ukrainian shield. Lvov: ZUKS. 366 p.
Shepel, S.I. (2003). Electrical properties of rocks in thermobaric conditions of the lithosphere and geoelectric models. Doctor’s thesis. Kiev, 411 p. (in Russian).
Shestopalov, V.M., Lukin, A.E., Zgonnik, V.A., Makarenko, A.N., Larin, N.V., & Bo¬gu¬slav¬skiy, A.S. (2005). Essays on the degassing of the Earth. Kyiv: Itek Service, 631 p. (in Russian).
Shilova, A.M., & Bilinskiy, A.I. (1983).On the conductivity of the sedimentary cover of Central Europe. Geofizicheskiy Zhurnal, 5(2), 90—93 (in Russian).
Shumlyanskiy, V.A. (2007). Tectonic conditions of the Cimmerian epoch of ore formation of the East European platform. In Scientific works of the Institute of Fundamental Research (pp. 50—68). Kiev: Logos (in Russian).
Siripunvaraporn, W., & Egbert, G. (2000). An efficient data-subspace inversion method for 2-D magnetotelluric data. Geophysics, 65(3), 791—803. https://doi.org/10.1190/1.1444778.
Sollogub, V.B. (Ed.). (1988). Lithosphere of Central and Eastern Europe. Geotraverse IY, YI, YIII. Kiev: Naukova Dumka, 172 s. (in Russian).
Sollogub, V.B. (1986). Lithosphere of Ukraine. Kiev: Naukova Dumka, 184 p. (in Russian).
Sollogub, V.B., Chekunov, A.V., Tripolskiy, A.A., & Babinets, V.A. (1978). Results of the study of the deep structure of the Ukrainian shield. In V.B. Sollogub, A. Guterkh, D. Prosen (Eds.), The structure of the Earth’s crust and upper mantle in Central and Eastern Europe (pp. 136—147). Kiev: Naukova Dumka (in Russian).
Sollogub, V.B., Ilchenko, T.V., Borodulin, M.A., Sologub, N.V., Guterkh, A., Matezhek, R., Perkhuts, E., Yanik, T., & Grad, M. (1988). Seismic field. In V.B.Sollogub (Ed.), Lithosphere of Central and Eastern Europe. Geotraverses IY, YI, YIII (pp. 67—70). Kiev: Naukova Dumka (in Russian).
Stănică, M., Stănică, D., & Marine-Furnică, C. (1999). The placement of the Trans-European Saturne zone of the Romanian territory by electromagnetic arguments. Earth, Planets and Space, 51, 1073—1078. https://doi.org/10.1186/BF03351581.
Taranyuk, M.F. (Ed.). (1981). Graphite-bearing map of the Ukrainian shield. Kiev: Publ. of the Ministry of Geology of the Ukrainian SSR (in Russian).
Tarasov, V.N., Logvinov, I.M., & Litvinov, D.A. (2013). Comparative analysis of graphical representation of 3D models based on magnetotelluric sounding data. Geoinformatika, (3), 1—8 (in Russian).
Tregubenko, V.I., Finchuk, L.L., & Belo¬shap¬skaya, N.V. (1989). Results of regional works by the MTS method of the north-western part of the Ukrainian SSR. Kiev: UTGF, 130 p. (in Russian).
Unsworth, M.J., & Rondenay, S. (2012). Mapping the distribution of fluids in the crust and li¬tho¬spheric mantle utilizing geophysical me¬thods. In D.E. Harlov, H. Austrheim (Eds.), Metasomatism and the Chemical Trans¬for¬ma¬ti¬on of Rock, Lecture Notes in Earth System Sciences (pp. 535—598). Berlin: Springer Verlag.
Varentsov, Iv.M. (2007). Joint robust inversion of MT and MV data. In Electromagnetic sounding of the Earth’s interior (Vol. 40, pp. 189—222). Elsevier.
Verkhovtsev, V.G. (2008). The newest platform geostructures of Ukraine and the dynamics of their development. Doctor’s thesis. Kyiv, 423 p. (in Ukrainian).
Verkhovtsev, V.G., Yuskiv, Yu.V., & Shvaiko, V.G. (2012). Active in the newest development stage of linear geostructures of Ukrainian Shield and its slopes. Technogenic and ecological safety and civil protection, (5), 49—59 (in Ukrainian)
Yang, X. (2011). Origin of High Electrical Conductivity in the Lower Continental Crust: A Review. Surveys in Geophysics, 32(6), 875—903. https://doi.org/10.1007/s10712-011-9145-z.
Yatsenko, V.G. (1998). Regularities of the spatial arrangement of graphite manifestations on the Ukrainian shield. In Aspects of mineralogy in Ukraine (pp. 254—270). Kiev: GNC ROS (in Rus¬sian).
How to Cite
Copyright (c) 2023 I.M. Logvinov, I.V. Gordienko, V.N. Tarasov, A.M. Logvinova
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Authors who publish with this journal agree to the following terms:
1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).