ГЕОЭКОЛОГИЯ


ИНЖЕНЕРНАЯ ГЕОЛОГИЯ. ГИДРОГЕОЛОГИЯ. ГЕОКРИОЛОГИЯ

Geoekologiya, 2021, Vol. 3, P. 3-18

NEOTECTONICS OF CONJUNCTION ZONE BETWEEN THE GREATER CAUCASUS MEGAVAULT AND THE BLACK SEA MEGADEPRESSION   

S. A. Nesmeyanov, O. A. Voeykova*

Sergeev Institute of Environmental Geoscience RAS,
Ulanskii per., 13, str. 2, Moscow, 101000 Russia

*Е-mail: voa49@mail.ru

The conjunction between the Greater Caucasus megavault and the Black Sea megadepression was previously interpreted as a subduction zone, a thrust, steep flexure, and a flexure-fault zone. Interpretation of the development history of these two conjugated megastructures should be based on the detailed geological-geophysical and geomorphological data. The orotectonic analysis permitted us to distinguish between the early and late orogenic southwestern boundaries of the megavault.  The early orogenic megavault side of the Greater Caucasus includes its boundary with the Tuapse foredeep filled with the Oligocene-Miocene deposits of the Maikopian Series. At the late orogenic stage, a significant part of the western periphery of the megavault sank and the Adler Depression rose. At the early orogenic stage, this depression was the eastern part of the Tuapse foredeep. The neostructural zoning of the modern shelf is suggested, showing a lower differentiation of block structures than the coastal parts of the megavault. The border between the modern shelf and the Tuapse foredeep is a fragment of the South Crimean-Caucasian flexural-discontinuous suture zone. Late orogenic subsidence of the megavault part indicates the taphrogenic effect of the expanding Black Sea megadepression on the Greater Caucasus orogen. In the Quaternary period, this effect was manifested in the activation of superimposed, mainly transverse grabens.

 

Keywords: megavault, megadepression, orogen, shelf, foredeep, graben, overthrust, flexure-fault zone, neotectonic stage, early orogenic and late orogenic stages, orotectonic method

 

REFERENCES

  1. Barkhatov, I.I., Nesmeyanov, S.A., Shmidt, G.A. Geologo-geofizicheskie materialy dlya vydeleniya seismogeneriruyushchikh struktur Severo-Zapadnogo Kavkaza i smezhnykh oblastei [Geological and geophysical materials for outlining seismogenerating structures in the Northwestern Caucasus and the adjacent areas]. Moscow, Nauka Publ. 1991, pp. 44-80. (in Russian)
  2. Baskakova, G.V., Nikishin, A.M. Vydelenie osnovnykh tektonicheskikh sobytij po dannym 2D-3D seismorazvedki v raione Tuapsinskogo i Kerchensko-Tamanskogo progibov i prilegayushchikh territorii [Identification of the main tectonic events according to 2D-3D seismic survey in the area of the Tuapse and Kerch-Taman troughs and adjacent territories]. Problemy tektoniki kontinentov i okeanov. Materialy LI Tektonicheskogo soveshchaniya [Problems of tectonics of continents and oceans. Proc. LI Tectonic workshop]. Moscow, GEOS Publ., 2019, vol. 1, pp. 60-64. (in Russian)
  1. Geologiya SSSR, Gruzinskaya SSR. [Geology of the USSR. Georgian SSR], vol. 10. Part 1, Moscow, Nedra Publ., 1964, 656 p. (in Russian)

4. Geologiya SSSR. Severnyj Kavkaz [Geology of the USSR. The Northern Caucasus], vol. 9. Part 1. Moscow, Nedra Publ., 1968, 759 p. (in Russian) 

5. Zemletryaseniya v SSSR v 1971 g. [Earthquakes in the USSR in 1971]. Moscow, Nauka Publ., 1975, 240 p. (in Russian)

6. Lobkovskii, L.I., Merklin, L.R., Kovachev, S.A. et al. Izuchenie seismichnosti dna Chernogo morya na uchastke trassy gazoprovoda Dzhubga—Samsun s pomoshch'yu donnykh seismicheskikh stantsii [Seismicity study at the Black Sea bottom within the section of the Dzhubga-Samsun gas pipeline route using the bottom seismic stations]. Moscow, TsIOB Publ., 1999, 246 p. (in Russian)

7. Lobkovskii, L.I., Kuzin, I.P., Kovachev, S.A. Detal'nye seismologicheskie issledovaniya s donnymi seismografami u Kavkazskogo poberezh'ya Chernogo morya [Detailed seismologic studies with bottom seismic stations near the Caucasian coast of the Black Sea]. Kompleksnye issledovaniya severo-vostochnoi chasti Chernogo morya [Comprehesnive studies in the northeastern part of the Black Sea]. Moscow, Nauka Publ., 2002, pp. 373-380. (in Russian)

8. Materialy po seismicheskomu raionirovaniyu Severo-Zapadnogo Kavkaza [Materials on seismic zoning of the Northwestern Caucasus]. Moscow, Nauka Publ., 1991, 100 p. (in Russian)

9. Meisner, A.L. Osnovnye razlomy vala Shatskogo i ikh vliyanie na formirovanie struktury Vostochno-Chernomorskogo regiona [The main faults of the Shatsky rampart and their influence on the formation of the structure in the East Black Sea region]. Vestnik MGU, Ser. 4, Geologiya. 2009, no. 4, pp. 14-19. (in Russian)

10. Meisner, L.B., Tugolesov, D.A. Tuapsinskii progib — vpadina s avtonomnoi skladchatost'yu [Tuapse foredeep as a depression with autonomous folding]. Geotektonika, 1998, no. 5, pp. 76-85. (in Russian)

11. Nesmeyanov, S.A. Osnovnye cherty neostrukturnogo raionirovaniya Severo-Zapadnogo Kavkaza [The main features of the neostructural zoning of the North-West Caucasus]. DAN SSSR, 1986, vol. 291, no. 6, pp. 1449-1453. (in Russian)

12. Nesmeyanov, S.A. Pripoverkhnostnye noveishie struktury Severo-zapadnogo Kavkaza i smezhnykh oblastei [Near-surface recent structures of the North-West Caucasus and adjacent areas]. Materialy po seismicheskomu raionirovaniyu Severo-Zapadnogo Kavkaza [Materials on seismic zoning of the North-West Caucasus]. Moscow, Nauka Publ., 1991, pp. 4-44. (in Russian)

13. Nesmeyanov, S.A. Neostrukturnoe raionirovanie Severo-Zapadnogo Kavkaza (operezhayushchie issledovaniya dlya inzhenernykh izyskanii) [Neostructural zoning of the North-West Caucasus (preliminary study for engineering surveys)]. Moscow, Nedra Publ., 1992, 254 p. (in Russian).

14. Nesmeyanov, S.A. Orotektonicheskii metod [Orotectonic method] Moscow, Mittel Press, 2017, 376 p. (in Russian)

15. Nesmeyanov, S.A. et al. Neostrukturnoe raionirovanie Severo-Zapadnogo Kavkaza. Karta m-ba 1:200 000 [Neostructural zoning of the Northwestern Caucasus. The map of a scale 1:200 000 ]. Moscow, PNIIIS Publ., 1995. (in Russian)

16. Nesmeyanov, S.А, Voeikova, O.А. Neotektonika Vorontsovskoi zony i problema molodykh nadvigov na Zapadnom Kavkaze [Neotectonics of the Vorontsovskaya zone and the problem of young thrusts in the Western Caucasus]. Geoekologiya, 2020, no. 4, pp. 3-20. (in Russian)

17 Nesmeyanov, S.A., Izmailov, Ya.A. Tektonicheskie deformatsii chernomorskikh terras Kavkazskogo poberezh'ya Rossii (Operezhayushchie issledovaniya dlya inzhenernykh izyskanii) [Tectonic deformations of the Black Sea terraces of the Caucasian coast of Russia (Advanced research for engineering surveys)]. Moscow, PNIIIS Publ., 1995, 239 p. (in Russian)

18. Nesmeyanov, S.A., Shmidt, G.A., Shcheglov, A.P. Morfostrukturnoe polozhenie seismodislokatsii yuzhnogo sklona Zapadnogo Kavkaza [Morphostructural position of seismic dislocations on the southern slope of the Western Caucasus]. Geomorfologiya, 1987, no. 3, pp. 74-79. (in Russian)

19. Popkov, V.I., Kritskaya, O.Yu., Ostapenko, А.А., Dement'eva, I.E., Bykhalova, O.N. O total'noi seismotektonicheskoi pererabotke yuzhnogo sklona Severo-zapadnogo Kavkaza [On the total seismotectonic processing of the southern slope of the Northwest Caucasus]. DAN, 2017, vol. 476, no. 4, pp. 431-434. (in Russian)

20. Rekomendatsii po seismicheskomu mikroraionirovaniyu pri inzhenernykh izyskaniyakh dlya stroitel'stva [Recommendations for seismic microzoning during engineering surveys for construction. Moscow, PNIIIS Publ., 1985, 73 p. (in Russian)

21. Tugolesov, D.A., Gorshkov, A.S., Meisner, L.M. Tektonika mezo-kainozoiskikh otlozhenii Chernomorskoi vpadiny [Tectonics of the Mesozoic-Cenozoic sediments of the Black Sea basin. Moscow, Nedra Publ., 1985, 215 p. (in Russian).

22. Torgunakov, A.V., Merklin, L.R., Shimkus, K.M. et al. Novye predstavleniya o stroenii shel'fa Kavkazskogo poberezh'ya ot pos. Arkhipo-Osipovka do pos. Dzhubga po dannym vysokorazreshayushchego seismoakusticheskogo profilirovaniya [New ideas about the construction of the shelf of the Caucasus coast from Arkhipo-Osipovka to Dzhubga settlements according to high-resolution seismic-acoustic profiling]. Kompleksnye issledovaniya severo-vostochnoi chasti Chernogo morya [Comprehensive studies of the northeastern part of the Black Sea]. Moscow, Nauka, 2002, pp. 358-367. (in Russian)

23. Tugolesov, D.A., Solov'ev, V.V. Tektonika i seismichnost' prikavkazskoi chasti Chernogo morya [Tectonics and seismicity of the near-Caucasian part of the Black Sea]. Otechestvennaya geologiya, 1995, no. 8, pp. 37-46. (in Russian)

24. Shimkus, K.M., Malovitskii, Ya.P., Shumenko, S.I. Korennye porody so dna Chernogo morya [Bedrocks from the bottom of the Black Sea]. Geologo-geofizicheskie issledovaniya Sredizemnogo i Chernogo morei [Geological and geophysical studies of the Mediterranean and Black Seas]. Moscow, Institute of Oceanology, USSR Academy of Sciences, 1979, pp. 26-44. (in Russian)

25. Shimkus, K.M., Moskalenko, V.N., Evsyukov, Yu.D., Lobkovskii, L.T., Torgunakov, A.V., Merklin, L.R. O roli neotektoniki opolznevykh i erozionno-akkumulyativnykh protsessov v formirovanii prikavkazskoi materikovoi okrainy [On the role of neotectonics of landslide and erosion-accumulative processes in the formation of the Pre-Caucasian continental margin]. Kompleksnye issledovaniya severo-vostochnoi chasti Chernogo morya [Integrated studies of the northeastern Black Sea]. Moscow, Nauka Publ., 2002, pp. 402-416. (in Russian)