Geoelectric heterogeneities of the Kerch iron ore basin
Keywords:crust, mantle, 3D geoelectrical model, deep and audiomagnetotelluric sounding, conductivity anomalies, mud volcanism, Kerch iron ore basi
The three-dimensional geoelectric model of the Earth’s crust and upper mantle of the Kerch Peninsula has been built for the first time based on the results of experimental observations of the Earth’s low-frequency electromagnetic field, carried out in 2007—2013 by the Institutes of the National Academy of Sciences of Ukraine. Its physical and geological interpretation and detailing of the near-surface part were carried out according to the data of the audiomagnetotelluric sounding method to study the deep structure of the Kerch iron ore basin. To the east of the Korsak-Feodosiya fault along the southern part of the Indolo-Kuban trough (in the north of the South Kerch and almost under the entire North Kerch zones), a low-resistance anomaly (ρ=1 Ohm∙m) was found at depths from 2.5 km to 12 km about 20 km wide. Its eastern part is located in the consolidated Earth’s crust and is galvanically connected with surface sedimentary strata, while the western part is completely in sedimentary deposits. The anomaly covers the territory of the Kerch iron ore basin and occurrences of mud volcanism. The characteristics of the upper part of the layered section of the Kerch Peninsula in the interval of the first hundreds of meters were obtained from the results of one-dimensional inversion of the audiomagnetotelluric sounding data (frequency range 8—4000 Hz). It is shown that the first 15 m of the section, corresponding to Quaternary deposits, have resistivity values up to 1 Ohm∙m. Below, in the Neogene sediments, the electrical resistance increases to values of 5 Ohm∙m and more. Both horizontally and vertically, the distribution of resistivity values has a variable character, manifesting as a thin-layered structure with low resistivity values. Possibly, such areas have a direct connection with the channel for transporting hummock material and gases. A connection is assumed between the low-resistivity thin-layered near-surface areas, a deep anomaly of electrical conductivity in the upper part of the Earth’s crust, and the likely high electrical conductivity of rocks at the depths of the upper mantle with iron ore deposits, as well as the manifestation of mud volcanism. The heterogeneity of the crustal and mantle highly conductive layers may indicate a high permeability of the contact zones for deep fluids.
Haletskyy, L. S. (Ed). (2001). Geology and minerals of Ukraine. Atlas. Kiev: Geos-ХХІ stolittya, 168 p. (in Ukrainian).
Burakhovich, T.K., Kushnir, A.N., Nikolaev, I.Yu., Sheremet, E.M., & Shirkov, B.I. (2016). Results of experimental electromagnetic studies of the Crimean region. Geofizicheskiy Zhurnal, 38(2), 57—78. https://doi.org/10.24028/gzh.0203-3100.v38i2.2016.107765 (in Russian).
Buryanov, V.B., Gordienko, V.V., Zavgorodnyaya, O.V., Kulik, S.N., & Logvinov, I.M. (1985). Geophysical model of the tectonosphere of Ukraine. Kiev: Naukova Dumka, 212 p. (in Russian).
Biletskyy V.S. (Ed.). (2004). Mining encyclopedic dictionary. Vol. 3. Donetsk: Skhidnyy vyda¬vny¬chyy dim, 752 p. (in Ukrainian).
Gordienko, V.V., Gordienko, I.V., Zavgorodnyaya, O.V., Logvinov, I.V., Tarasov, V.N., & Usenko, O.V. (2004). Geothermal atlas of Ukraine. Kiev: Published by the Institute of Geophysics of the National Academy of Sciences of Ukraine, 60 p. (in Russian).
Ivanitskyy, V. P., Ponomarenko, О. M., Bryk, A. B., Dudchenko, N. O., Polshyn, E. V., Red’¬ko, Ya. V., & Ovsienko, V. V. (2016). Effect of ther¬mal treatment with starch of Kerch iron ores on their properties by data Mossbauer spectroscopy. Mineralohichnyy Zhurnal, 38(1), 21—31. https://doi.org/10.15407/mineraljournal. 38.01.021 (in Ukrainian).
Kutas, R. I. (2020). Geotectonic and geothermal conditions of the gas discharge zones in the Black Sea. Geofizicheskiy Zhurnal, 42(5), 16—52. https://doi.org/10.24028/gzh.0203-3100.v42i5.2020.215070 (in Russian).
Kushnir, A. M. (2019). Geoelectrical heterogeneities of the crust and upper mantle of the territory of Ukraine. Doctor¢s thesis. Kyiv, 38 p. (in Ukrainian).
Kushnir, A. M., & Burakhovich, T. K. (2021).Geoelectricalinhomogeneities of the Crimean region as the seismicity and oil-gas potential zones. Geofizicheskiy Zhurnal, 43(1), 69—92. https://doi.org/10.24028/gzh.0203-3100.v43i1.2021.225494 (in Ukrainian).
Naumenko, P. I. (1977). Some regularities of placement of ore deposits of Kerch and Tamansky area in connection with features of its tectonic building. Geologicheskiy Zhurnal, 37(6), 28—37 (in Russian).
Nesterovskiy, V. A. (2020). An unique industrial-genetic type of sedimentary deposits. Heolohiya i korysni kopalyny Svitovoho okeanu, 16(1), 54—68. https://doi.org/10.15407/gpimo2020.01.054 (in Russian).
Pashkevich, I. R., Rusakov, O. M., Kutas, R. I., Gryn, D. N., Starostenko, V. I., & Janik, T. (2018). Lithospheric structure based on integrated analysis of geological-geophysical data along the DOBREfraction’99/DOBRE-2 profile (the East European Platform — the East Black Sea Basin). Geofizicheskiy Zhurnal, 40(5), 98—136. https://doi.org/10.24028/gzh.0203-3100.v40i5.2018.147476 (in Russian).
Glushkov, V. V. (Ed.). (1988). Tectonic Map of the Ukrainian SSR and the Moldavian SSR. 1:500 000. Kiev: UkrNIGRI, GAP Ukrgeologiya (in Russian).
Kholodov, V. N. (2012). Mud volcanoes: distribution and genesis. Geologiya i poleznyye iskopayemyye Mirovogo okeana, (4), 5—27 (in Russian).
Digital catalog of the state geological maps of the Russian Federation of scale 1:1 000 000. Scythian series. Sheet L-36.Explanatory note. (2019). St. Petersburg: Publishing house VSEGEI, 979 p. (in Russian).
Sheremet, E. M., Burakhovich, T. K., Dudik, A. M., Nikolaev, I. Yu., Dudik, S. A., Kushnir, A. N., & Agarkova, N. G. (2016). Geoelectric and geochemical studies in predicting hydrocarbons in Ukraine. Kiev: Komprint, 489 p. (in Russian).
Shnyukov, E. F., Deyak, M. A., & Naumenko, S. P. (2018). Mud volcanoes of the Kerch peninsula as potential precursors of the earthquakes. Heolohichnyy Zhurnal, (2), 33—41. https://doi.org/10.30836/igs.1025-6814.2018.2.133455 (in Russian).
Shnyukov, E. F., Naumenko, P. Y., Lebedev, Yu. S., Usenko, V. P., Hordyevych, V. A., Yukhanov, Y. S., & Shchyrytsa, A. S. (1971). Mud volcanism and ore formation. Kiev: Naukova Dumka, 332 p. (in Russian).
Yudin, V. V. (1995). Predgornayasutura of the Crimea. Geologicheskiy Zhurnal, (3-4), 56—61 (in Russian).
Yurovskiy, Yu. G. (1997). Seismicity and fluid migration of the Kerch-Taman region.Geodynamics of the Crimean-Black Sea region.Proceedings of the conference 22—28 September 1996 (pp. 133—134). Simferopol: Edition of the Crimean Expert Council on Seismic Hazard Assessment and Earthquake Prediction (in Russian).
Mackie, R. L., Smith, J. T. & Madden, T. R. (1994). Three dimensional electromagnetic modeling using finite difference equations: the magnetotelluric example. Radio Science, 29, 923—935. https://doi.org/10.1029/ 94RS00326.
Rudmin, M., Mazurov, A., & Banerjee, S. (2019). Origin of ooidal ironstones in relation to warming events: Cretaceous-Eocene Bakchar deposit, south-east Western Siberia. Marine and Petroleum Geology, 100, 309—325. https://doi.org/10.1016/j.marpetgeo.2018.11.023.
Sokol, E., Kokh, S., Kozmenko, O., Nekipelova, A., Rudmin, M., Khvorov, P., & Artemyev, D. (2020). Geochemistry and mineralogy of rare earth elements in high-phosphorus ooidal ironstones: A case study of the Kamysh-Burun deposit (Azov-Black Sea iron Province). Ore Geology Reviews, 127, 103827. https://doi.org/10.1016/j.oregeorev. 2020.103827.
How to Cite
This work is licensed under a Creative Commons Attribution 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).