The relation of the northwestern shelf deep geological structure of the Black Sea with the phenomenon of gas seeps


Keywords: gas seeping, geological structure, north-western shelf, Black Sea, depth structure, geophysical model

Abstract

Geophysical model inputs were the results of a survey on an anomalous magnetic field and a gravitational field of the Black Sea’s north-western shelf. Thegeophysical profiles of the complex effective parameter (CEP) are calculated and graphed. Complex effective parameter characterizes the relationship between the effective densities and the magnetization by their spatial distribution. Effective parameters (magnetization, density, CEP) were calculated within the studyarea with their distribution on the optimum depth. The profiles are meridional and parallel to each other, direction of the profiles from south to north. The distance between the profiles is 50 kilometers. The generalized deep structure of the study area was elucidated using the graphed profiles. The distribution of CEP on vertical sections within the shelf zone of the western Black Sea basin emphasizes the position in the space of tectonic elements. That is gives an idea about the nature and structure of the region’s lithosphere and their relationship with the spatial distribution of deposits and manifestations of hydrocarbons. Structural and geological interpretation of the CEP profile data was performed. According to the spatial consistency of the correlation by structures, the profiles are conditionally divided into two groups, the western and the eastern. Structural differences in profiles are explained by the presence of the Odesa-Sinop fault zone between the groups. According to the results of profiles interpretation and works of previous researchers, paleogeodynamic processes were established. That significantly complicated the geological structure of the Black Sea’s north-western shelf. The interpretation of the CEP field distribution gives additional arguments in favour of the Earth crust evolution on the north-western shelf of the Black Sea in the conditions of a passive continental margin with short periods of reverse motions with obligatory subduction due to the activation of rifting, the nature of which is yet to be studied. According to the results of interpretation, the presence of the Earth’s crust destruction zone was established. With the help of spatial analysis, the spatial regularities of the gas seeping manifestations with the zone of destruction of the Earth’s crust of continental type and sites of rising of the mantle surface are established.

Author Biographies

Sergii V. Goshovskyi
Ukrainian State Geological Research Institute, Kyiv
Oleksii O. Likhosherstov
Ukrainian State Geological Research Institute, Kyiv
Olexandr M. Shevchenko
Ukrainian State Geological Research Institute, Kyiv
Svitlana G. Slonitska
Ukrainian State Geological Research Institute, Kyiv

References

1. Gintov, O.B., Egorova, T.P., Tsvetkova, T.A., Bugayenko, I.V., MurovskayaA.V., 2014. Geodinamicheskiye osobennosti zoni sochleneniya Evraziyskoi plitie Alpiysko-Gimalayskogo poyasa v predelah Ukraini i prilegayuschih territoriy. [Geodynamic features of the junction zone of the Eurasian Plate and the Alpine-Himalayan belt within Ukraine and adjacent territories]. Geophisical journal. vol.36. (5), 26-63 (in Russian).
2. Gurskiy, D.S., Kruglov, S.S., 2007. Tektonichna karta Ukraini. Masshtab 1: 1 000 000. Poyasnuvalna zapiska. Chastina 1. [Tectonic map of Ukraine. Scale 1: 1 000 000. Explanatory note. Part 1]., Kyiv, UkrSGRI (in Ukrainian).
3. Egorov, V.N., Artemov, Yu.G., &Gulin, S.B., 2011. Metanovyesipy v Chernom more – sredoobrazuyushchaya I ekologicheskaya rol’. [Black Sea methane
seeping – environment-forming and ecological role], Sevastopol: NPTs “EKOSI-Gidrofizika”. (in Russian).
4. Kirilyuk, V.P., 2005. Tektonichna karta fundamentu Ukrainskogo schita (na osnivi strukturnih poverhiv) masshtabu 1:2 000 000. Poyasnuvalna zapiska. [Tectonic map of the Ukrainian shield (on the base of structural levels) in scale 1:2 000 000. Explanatory note.]. Lviv(in Ukrainian).
5. Kobolev, V.P., 2017. Strakturno-tektonicheskiye i fluido-dinamicheskiye aspect glubinnoy degazacii megavpadini Chernogo morya. [Structural, tectonic and fluid-dynamic aspects of deep degassing of the Black Sea megatrench]. Mining of mineral Deposits. Volume 11, 31-49 (in Russian).
6. Koval, L.A., Priezzhev, I.I., 1983. Metodicheskie rekomendatsii po primeneniyu avtomatizirovannoy sistemyi obrabotki aerogeofizicheskih dannyih na EVM ES (ASOM-AGS/ES). [Guidelines for the use of an automated system for processing air prospect geophysical data on an EC computer (ACOM-AGS / EU)]. Alma-Ata, KazVIRG-KazPTI (in Russian).
7. Lukin, A.E., 2003. Izotopno-geokhimicheskie indicatory uglekisloy i uglevodorodnoy degazatsii v AzovoChernomorskom regione. [Isotope-geochemical indicators of carbon dioxide and carbohydrate degassing in the Azov-Black Sea region.] Heolohichnyi Zhurnal, (1), 59-73 (in Russian).
8. Samsonov, V.Y., Chumak, O.M., 2004. Shema glibinnoi geologichnoyi budovi Chornomorskoyi ekonomichnoyi zoni Ukraini ta prileglih plosch. Masshtab 1:1 500 000. [The depth geological structure scheme of the Ukrainian Black Sea economic zone. In scale 1:1 500 000] (in Ukrainian).
9. Shnyukov, E.F., Kobolev, V.P., &Pasynkov, A.A., 2013. Gazovyy vulkanizm Chernogomorya. [Gas volcanism of the Black Sea.] Kyiv: Lohos. (in Russian).
10. Shnyukova, Е.Е., 2016. Magmatizm zoni sochleneniya Zapadno-Chernomorskoy vpadini. [Magmatism of the junction zone of the West Black Sea Depression, Mountain Crimea and the Scythian Plate]. Kyiv, Naukova Dumka, (in Russian).
Published
2020-10-09
How to Cite
Goshovskyi, S., Likhosherstov, O., Shevchenko, O., & Slonitska, S. (2020). The relation of the northwestern shelf deep geological structure of the Black Sea with the phenomenon of gas seeps. Journal of Geology, Geography and Geoecology, 29(3), 495-501. https://doi.org/https://doi.org/10.15421/112044