| ||
|
| ||
|
doi: 10.24412/2687-1092-2023-10-85-92
1 Lomonosov Moscow State University, Moscow, Russia 2LLC RN-Exploration, Moscow, Russia
|
|
Abstract. Based on 2D/3D standard resolution seismic (SR), 2D high (HR) and ultra-high (UHR) resolution seismic, sub-bottom profiling (SBP) and multibeam echosounder (MBES) data, paleovalleys and paleodepressions were identified in the southern-west part of the Kara Sea. Three paleovalleys generations formed in result of presumably fluvial, fluvio-glacial and exaration processes in Pliocen(?)-Quaternary period were detected. In the process of a detailed analysis of the internal structure of paleovalleys, it was revealed that most of them (more than 60%) are characterized by a U-shaped form, which may be due both to the predominance of lateral erosion processes in calm tectonic conditions and to the primary role of glaciers that probably existed in the research area in the late Quaternary period [Zamotina et. al., 2023a; Rybalko et. al., 2020; Svendsen et al., 2004]. In the area of the northern part of the West Kara Stage and the Yamalo-Gydan Shoal, paleovalleys with signs of permafrost deposits were found, as well as presumably thermokarst paleodepressions, which may indicate that the part of the area under consideration was not covered by a glacier at the maximum of the last glaciation. Based on 3D SR data, a significant restructuring of the paleovalleys network was revealed in the area of the southwestern part of the Kara Sea shelf. Keywords: paleovalleys, paleodepressions, Last Glacial Maximum, thermokarst, seismic, shelf, Kara Sea
REFERENCES: Viskunova K.G., Zinchenko A.G., Kalenich A.P., Kiyko O.A., Kozlov S.A., Kostin D.A., Kuzin I.L., Lopatin B.G., Orgo V.V., Penedyuk E.V., Ustinov N.V., Shkarubo S.I., Yakovleva T.V. State geological map of the Russian Federation, Scale 1:1,000,000 (new series), Sheet S41-43 – Bely Island. Explanatory letter. St. Petersburg: Publishing house of St. Petersburg cart factory VSEGEI, 2004, 206 p. State geological map of the Russian Federation. Sheet S41-43. Scale 1:1,000,000. JSC MAGE, Federal State Budgetary Institution VNIIOkeangeology. Authors: Kostin D.A., Kuzin I.L., Lopatin B.G. Zamotina Z.S., Khlebnikova O.A., Terekhina Ya.E., Roslyakov A.G., Repkina T.Yu., Rybalko A.E., Kolyubakin A.A. Determination of the boundary of the maximum distribution of the last glaciation based on seismoacoustics and multibeam echo sounding data (southwestern part of the Kara Sea) // Geophysics. 2023. No. 2. pp. 29-39. doi: 10.34926/geo.2023.82.15.004 Zamotina Z.S., Terekhina Ya.E., Rybalko A.E., Repkina T.Yu., Kolyubakin A.A., Goncharova A.M. Features of the distribution of erosion-accumulative landforms in the northern part of the East Prinovozemelsky region of the Kara Sea // Proceedings of the XI International Scientific and Practical Conference “Marine Research and Education (MARESEDU)-2022” Volume IV (IV). 2022. Tver: PolyPRESS LLC. T.4. pp. 245-250. Zamotina Z.S., Starovoytov A.V., Tokarev M.Yu., Terekhina Y.E., Kolubakin A.A., Goncharova A.M. Paleovalleys and paleodepressions of the Kara Sea Vostochno-Prinovozemelsky area // Moscow University Bulletin. Series 4. Geology. 2023. No. 2. pp. 117–127. doi: 10.55959/MSU0579-9406-4-2023-63-2-117-127 Lastochkin A.N. Underwater valleys of the northern shelf of Eurasia // Izvestija of the All-Union Geographical Society. 1977. T. 109. No. 5. pp. 412-417. Musatov E.E. Classification of river paleovalleys of the Barents-Kara shelf in modern times // Abstracts of the 2nd All-Union Conference “Problems of Quaternary paleoecology and paleogeography of the northern seas”. Apatity: USSR Academy of Sciences. 1987. pp. 79-80. Rybalko A.E., Mironyuk S.G., Roslyakov A.G., Kolyubakin A.A., Solovieva M.A., Terekhina Ya.E., Tokarev M.Yu. New signs of glaciation in the Kara Sea: mega-scale glacial lineation in the East-Novozemelsky trench // Relief and Quaternary deposits of the Arctic, Subarctic and North-West Russia. 2020. Issue 7. P. 175-181. doi:10.24411/2687-1092-2020-10727 Shipilov E.V., Shkarubo S.I. Modern problems of geology and tectonics of sedimentary basins of the Eurasian-Arctic continental margin, Vol. 1 Lithological and seismostratigraphic complexes of sedimentary basins of the Barents-Kara shelf (Ed. Matishov G.G.) - Apatity: Publishing house of the KSC RAS, 2010, 266 pp. Jakobsson M., Mayer L.A., Coakley B., Mayer L., Coakley B., Dowdeswell J.A., Forbes S., Fridman B., Hodnesdal H., Noormets R., Pedersen R., Rebesco M., Schenke H.W., Zarayskaya Yu., Accettella D., Armstrong A., Anderson R.M., Bienhoff P., Camerlenghi A., Church I., Edwards M., Gardner J.V., Hall J.K., Hell B., Hestvik O., Kristoffersen Y., Marcussen Ch., Rezwan M., Mosher D., Nghiem S.V., Pedrosa M.T., Travaglini P.G., Weatherall P. The International Bathymetric Chart of the Arctic Ocean (IBCAO) Version 3.0 // Geophys. Res. Lett., 2012, v. 39, L12609. doi: 10.1029/2012GL052219 Lambeck K., Rouby H., Purcell A., Sun Y.Y., Sambridge M. Sea level and global ice volumes from the Last Glacial Maximum to the Holocene // Proc. Nat. Acad. Sci. USA. 2014. Vol. 111. Is. 43. P. 15296–15303. doi: 10.1073/pnas.141176211 Sejrup H.P., Hjelstuen B.O., Patton H., Esteves M., Winsborrow M., Rasmussen T.L., Andreassen K., Hubbard A. The role of ocean and atmospheric dynamics in the marine-based collapse of the last Eurasian Ice Sheet // Communications Earth& Environmment. 2022. Vol. 3. Is. 119. doi: 10.1038/s43247-022-00447-0 Svendsen J.I., Alexanderson H., Astakhov V.I., Demidov I., Dowdeswell J. A., Funder S., Gataulling V., Henriksena M., Hjorti C., Houmark-Nielsenj M., Hubbertenk H. W., Ingolfsson O., Jakobssonm M., Kjæri K. H., Larsenn E., Lokrantzo H., Lunkka J. P., Astrid L., Mangeruda J., Matiouchkov A., Murrayr A., Molleri P., Niessens F., Nikolskaya O., Polyak L., Saarnisto M., Siegert C., Siegertv M. J., Spielhagen R. F., Stein R. Late Quaternary ice sheet history of northern Eurasia // Quaternary Science Reviews. 2004. Vol. 23. P. 1229-1271. doi: 10.1016/j.quascirev.2003.12.008
|
|
Cite this article:
Zamotina Z.S., Starovoutov A.V., Tokarev M.Yu., Terekhina Ya.E., Kolubakin A.A. Paleovalleys and paleodepressions of the southern-west part of the Kara sea according to seismic data // Relief and Quaternary deposits of the Arctic, Subarctic and North-West Russia. 2023. Issue 10. P. 85-92. doi: 10.24412/2687-1092-2023-10-85-92
|
