Geodynamic features of the seismotectonic structures in the central part of the Chersky Zone (North-East of Russia)
https://doi.org/10.31242/2618-9712-2019-24-2-1
Abstract
Relationship between large intracontinental depressions in the north-east of Russia (the system of Momo-Selennyakh depressions) and the regional Verkhoyansk-Kolyma fault system breaking through the zone of the Chersky Ridges to the north-west is considered. A review is presented over the data on the nature of these depressions, which developed since the Miocene till the Pleistocene as rift troughs, It is shown that a change of the tectonic regime occurred in the Middle Pleistocene, and the indicated structures are developing in the field of regional compression. This is confirmed by the entire set of geological, geophysical and geodynamic data and by the prevailing type of tectonic motions in the Verkhoyansk-Kolyma fault system corresponding to strike-slips, overthrusts and thrust-faults. The zone affected by the general Ulakhan fault is analyzed as an example. This zone is a shear boundary between the North American and Eurasian lithospheric plates, and it controls modern tectonic processes in the north-east of Russia.
Keywords
active faults,
seismicity,
neotectonci structures,
focal mechanisms of earthquakes,
modern geodynamics,
paleoseismic dislocations
Supporting agencies: The study is done on state assignment of DPMGI SB RAS with the support of Ministery of Science and Higher Education of the Russian Federation and with support of RFBR (grant no. 19-05-00062).
About the Authors
Valeriy Suleimanovich Imaev
Institute of the Earth’s Crust, SB RAS
Russian Federation
Russian Federation
Imaev Valeriy Suleimanovich, Doctor of Geological and Mineralogical Sciences, Academician of the Academy of Sciences of the Republic of Sakha (Yakutia), Principal Researcher, Institute of the Earth’s Crust, SB RAS, 128 Lermontova str., Irkutsk, 664033 Russia, https://orcid.org/0000-0002-6510-0526, imaev@crust.irk.ru;
Lyudmila Petrovna Imaeva
Institute of the Earth’s Crust, SB RAS
Russian Federation
Russian Federation
Imaeva Lyudmila Petrovna, Candidate of Geological and Mineralogical Sciences, Senior Researcher, Institute of the Earth’s Crust, SB RAS, 128 Lermontova str., Irkutsk, 664033, Russia, https://orcid.org/0000-0002-8235-7112, imaeva@crust.irk.ru;
Boris Mikhailovich Kozmin
Diamond and Previous Metal Geology Institute, SB RAS
Russian Federation
Russian Federation
Kozmin Boris Mikhailovich, Candidate of Geological and Mineralogical Sciences, Leading Researcher, Diamond and Previous Metal Geology Institute, SB RAS, 39 Lenina pr., Yakutsk, 677980, Russia, https://orcid.org/0000-0003-4270-1318, b.m.kozmin@diamond.ysn.ru.
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Review
For citations:
Imaev V.S., Imaeva L.P., Kozmin B.M. Geodynamic features of the seismotectonic structures in the central part of the Chersky Zone (North-East of Russia). Arctic and Subarctic Natural Resources. 2019;24(2):5-20. (In Russ.) https://doi.org/10.31242/2618-9712-2019-24-2-1
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