Speed structure of the mantle of the border of the Eastern European and West European platforms
Keywords:seismic tomography, mantle, East European platform, West European platform, super-deep fluids, oil and gas fields
This work is devoted to studying the velocity structure of the mantle of the border area of the East European and West European platforms in the crust separated by the Teiserre-Tornquist zone. The mantle under the territory of Poland and Western Ukraine is being investigated. The work uses a three-dimensional P-velocity model of the mantle, constructed using the Taylor approximation method developed by V. S. Geyko. The method’s advantages are independent of the initial approximation (reference model) and the best approximation of nonlinearity. In this area, the exploration depth is 2500 km south of 50 °NL and 1700 km north of 50 °NL. A detailed analysis of horizontal sections of a 3D P-velocity model of the mantle up to a depth of 850 km with a step of 50 km has been carried out. The change in the spatial distribution of the zero seismic velocity boundary is analyzed throughout the depths. This boundary separates the high-velocity upper mantle of the East European Platform and the low-velocity upper mantle of the West European Platform. At the depths of the transition zone of the upper mantle, this boundary separates the low-velocity upper mantle of the East European platform and the high-velocity upper mantle of the West European platform (in this geosphere, a velocity inversion has occurred with respect to the upper mantle).
In latitudinal sections, two inclined layers are distinguished. One of them is associated with the upper mantle under the DDV and reaches the mantle under the Carpathians, where it begins to plunge into the high-velocity transition zone of the upper mantle. The second layer is associated with the mantle under the northwestern end of the Baltic syneclise, which extends to the mantle under the Presudet monocline, where it also plunges into the high-velocity transition zone of the upper mantle. In longitudinal sections, inclined layers are distinguished, extending from the mantle under the South Scandinavian megablock of the Baltic Shield to the mantle under the Bohemian massif and the Carpathians, where they plunge into the high-velocity transition zone of the upper mantle.
In the study area, three super-deep fluids were identified, characterized by increased stratification of the medium (alternation of higher and lower velocities). The first includes the well-known oil and gas fields of the Central European oil and gas basin (Pomorie and Presudet monocline (Poland)). The second is associated with oil and gas fields of the North Ciscarpathian oil and gas basin (southeastern Poland) and the Carpathian oil and gas basin (Western Ukraine). The extracted super-deep fluid in the mantle of the Baltic Sea corresponds to both the Gdansk Gulf of the Baltic Sea and the Kaliningrad fields (southeast of the Baltic Sea).
Chekunov, A. V. (1993). Geophysical research of the lithosphere: Collection of scientific works. Kiev: Naukova Dumka, 155 p. (in Russian).
Geyko, V. S. (1997). Taylor approximation of the wave equation and the eikonal equation in inverse seismic problems. Geofizicheskiy Zhurnal, 19(3), 48—68 (in Russian).
Geyko, V. S., Tsvetkova, T. A., Shumlyanskaya, L. A., Bugaenko, I. V., & Zaets, L. N. (2005). Regional 3-D P-velocity model of the Sarmatian mantle (south-west of the East European platform). Geofizicheskiy Zhurnal, 27(6), 27—39 (in Russian).
Gufeld, I. L. (2007). Seismic process. Physico-chemical aspects. Scientific publication. Koro¬lev: TSNIIMash, 160 p. (in Russian).
Letnikov, F. A. (1999). Fluid facies of the continental medium and problems of ore formation. Smirnovsky collection (pp. 63—95). Moscow: Publ. house of Moscow State University (in Rus¬sian).
Lukin, A. E., & Shestopalov, V. M. (2018). From new geological paradigm to the problems of regional geological-geophysical survey. Geofizicheskiy Zhurnal, 40(4), 3—72. https://doi.org/10.24028/gzh.0203-3100.v40i4.2018.140610 (in Russian).
Pavlenkova, N. I. (2001). The structure of the earth’s crust and upper mantle and the mechanism of motion of deep matter. Vestnik OGGGGN RAN, (4), 1—18 (in Russian).
Pushcharovskiy, Yu. M., & Pushcharovskiy, D. Yu. (2010). Geology of the Earth’s mantle. Moscow: Geos, 138 p. (in Russian).
Rodkin, M. M., Rundkvist, D. V. (2017). Geofludynamics. Appendix to seismologists, tectonics, processes of ore and oil and gas. Dolgoprudnyy: Intellect Publishing House, 288 p. (in Russian).
Guterh, A., Prosen, D., & Sollogub, V. B. (Eds.). (1978). Structure of the Crust and Upper Mantle of the Central and Eastern Europe. Kiev: Naukova Dumka, 271 p. (in Russian).
Khain, V. E. (2001). Tectonics of continents and oceans. Moscow: Nauchnyy Mir, 604 p. (in Rus¬sian).
Khain, V. E., & Lomize, M. G. (2005). Geotectonics and fundamentals of Geodynamics. Moscow: Publ. house of Moscow State University 480 р. (in Russian).
Tsvetkova, T. A., & Bugaenko, I. V. (2012). Seismotomography of the mantle under the East European platform: mantle velocity boundaries. Geofizicheskiy Zhurnal, 34(5), 161—172. https://doi.org/10.24028/gzh.0203-3100.v34i5. 2012.116672 (in Russian).
Shestopalov, V. M., Lukin, A. E., Zgonnik, V. A., Makarenko, A. N., Larin, N. V., & Boguslavskiy, A. S. (2018). Essays on Earth degassing. Kiev: Publ. of the Institute of Geological Sciences of NAS of Ukraine; Radioenvironmental Center, 632 p. (in Russian).
Yanovskaya, T. B., & Koroleva, T. Y. (2012). The velocity structure of the upper mantle in the transition zone from the East European platform to Western Europe from seismic noise data. Fizika Zemli, (7-8), 3—9 (in Russian).
Geyko, V. S. A general theory of the seismic travel-time tomography. Геофиз. журн. 2004. Т. 26. № 1. С. 3—32.
Grad, M., Tiira, T., & ESC Working group (2009). The Moho depth map of the European Plate. Geophysical Journal International, 176(1), 279—282. https://doi.org/10.1111/j.1365-246X.2008. 03919.x.
Janik, T., Starostenko, V., Aleksandrowski, P., Yegorova, T., Czuba, W., Środa, P., Murovskaya, A., Zajats, K., Kolomiyets, K. Lysynchuk, D., Wójcik, D., Mechie, J., G łuszyński, A., Omelchenko, V., Legostaeva, O., Tolkunov, A., Amashukeli, T., Gryn, D., Chulkov, S. Сейсмический эксперимент TTZ-South. Геофиз. журн. 2020. Т. 42. № 3. С. 3—15. https://doi.org/10.24028/gzh.0203-3100.v42i3.2020.204698.
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).