S.A. Bornyakov 1, A.A. Karimova 1,2
1Institute of the Earth's Crust, Siberian Branch of RAS, Irkutsk, Russia
2Irkutsk State University, Irkutsk, Russia
Bornyakov Sergey Alexandrovich,
candidate of geological and mineralogical sciences,
664033 Irkutsk, st. Lermontova, d. 128,
Institute of the Earth's Crust SB RAS,
Senior Researcher Fellow,
email: bornyak@crust.irk.ru.
Karimova Anastasiya Alexeevna,
candidate of geological and mineralogical sciences,
664003 Irkutsk, Lenin str., 3,
Irkutsk State University, Faculty of Geology, senior lecturer,
664033 Irkutsk, st. Lermontova, 128,
Institute of the Earth's Crust SB RAS,
Junior Research Fellow,
еmail: tarasova@crust.irk.ru.
Abstract. Dynamic settings of the formation of discontinuous systems in a sedimentary cover of the Siberian platform in the area of the Kovykta gas condensate deposit that existed in the Paleozoic and Cenozoic are consistent with those for its southern edge, which allows us to talk about their possible relationship with the determining role of the latter in relation to the former. The Kovykta area is more than 100 km away from the southern edge of the Siberian platform. In this regard, the presence of the discussed relationship requires additional argumentation in the form of substantiation of the physical possibility of transmitting deformations along the sedimentary cover at such a distance from the edge of the platform.
The authors, in compliance with the conditions of similarity, performed physical modeling of the geodynamic conditions of N-W compression, left-sided shear and S-E tension, which operated on the southern edge of the Siberian platform in the Paleozoic, early Cenozoic and middle-late Cenozoic, respectively. The results of the simulation showed that under certain boundary conditions of the experiments, deformations can propagate from the edge of the model to its inner parts over long distances only ubder compression and extention. Under conditions of shearing, the lateral dimensions of the area of spatial propagation of deformations in the model are always smaller than those observed in its natural counterpart. This indicates that the Early Cenozoic dynamic environment of the left sheare in the sedimentary cover of the Kovykta gas condensate deposit owes its origin to a complex of geodynamic processes on all active margins of the Siberian platform.
Keywords: Siberian platform, sedimentary cover, dynamic setting, physical modeling.
P. 104–113
Gzovsky M.V. Basics of tectonophysics. – M.: Nauka, 1975. 536 p.
Zorin Yu.A., Sklyarov E.V., Belichenko V.G., Mazukabzov A.M. Mechanism of development of the system island arc – backarc basin and geodynamics of the Sayano-Baikal folded region in the late Rephean-early Paleozoic // Geology and Geophysics. 2009. V. 50, No. 3. P. 209–226.
Sankov V.A., Parfeevets A.V., Miroshnichenko A.I., Byzov L.M., Lebedeva M.A., Sankov A.V., Dobrynina A.A., Kovalenko S.N. Late Ceinozoic formation of fractures and stress in the southeastern part of the Siberian platform // Geodynamics and tectonophysics. 2017. V. 8. No. 1. P. 81–105. doi:10.5800/GT-2017-8-1-0233.
Seminsky K.Zh., Sankov V.A., Ogibenin V.V., Burzunova Yu.P., Miroshnichenko A.I., Gorbunova E.A., Gorlov I.V., Smirnov A.S., Vakhromeev A.G., Buddo I.V. Tectonophysical approach to the analysis of geological and geophysical data at gas condensate fields with a complex structure of the platform cover // Geodynamics and Tectonophysics. 2018. V. 9. No. 3. P. 587–627. doi:10.5800/GT-2018-9-3-0364.
Sim L.A., Gordeev N.A., Marinin A.V. The latest geodynamics in the eastern margin of the Siberian platform // Geosystems of transition zones. 2018. V. 2, No. 4. P. 280–289.
Sherman S.I. Physical regularities of the development of faults in the Earth's crust\. Novosibirsk: Nauka. Siberian Branch, 1977. 102 p.
Sherman S.I., Dneprovsky Yu.I. Fields of stress in the Earth's crust and geological-structural methods of their study // Novosibirsk: Nauka. Siberian Branch, 1989. 158 p.
Molnar P., Tapponnier P. Cenozoic tectonics of Asia: effects of continental collision // Science. 1975. V.189. P. 419–426.
San’kov V.A., Mirosnichenko A.I., Levi K.G., Lukhnev A., Melnikov A. A & Delvoux Cenozoic stress field evolution in the Baikal Rift Zone, [Evolution du champ de contrainte cenoroique dans Ie rift du Baikal // 1997, Bull, Centre Recb. Elf. Explor. Prod., 21, 2, 435–455.
Zamaraev S.M., Adamenko O.M., Ryazanov G.V., Kulchitsky A.A., Adamenko R.S., Vikentieva N.M. Structure and History of the Development of the Predbaikalsky foredeep. Nauka, Moscow, 1996. 134 p. (in Russian) [Замараев С.М., Адаменко О.М., Рязанов Г.В., Кульчицкий А.А., Адаменко Р.С., Викентьева Н.М. Структура и история развития Предбайкальского предгорного прогиба. М.: Наука, 1976. 134 с.].
Sizykh V.I. Sharyazh-Thrust Tectonics of the Margins of Ancient Platforms. SB RAS Publishing House, Novosibirsk, 154 p. (in Russian) [Сизых В.И. Шарьяжно-надвиговая тектоника окраин древних платформ. Новосибирск: Изд-во СО РАН, 2001. 154 с.].
Bornyakov S.A. Features of rupture formation in a rheologically heterogeneous sedimentary cover over active foundation faults: according to the results of physical modeling [Electronic resource] / S.A. Bornyakov, S.P. Primina, Yu.V. Chubakova
// Geology and Environment.— 2022.— V. 2, No. 4.— P. 104–113. DOI 10.26516/2541-9641.2022.4.104
Access Mode: http://geoenvir.ru/archive/g&e22-2-4/bornyakov22-4.htm (30.12.2022).