resarПриродные ресурсы Арктики и СубарктикиArctic and Subarctic Natural Resources2618-97122686-9683Академия наук Республики Саха (Якутия)10.31242/2618-9712-2020-25-2-1resar-226Research ArticleНауки о Земле. Общая и региональная геология, петрология и вулканологияEarth sciences. General and regional geology, petrology and volcanologySeismotectonics of the northern sector of the Verkhoyansk fold system (northeast of the Russian Arctic)https://orcid.org/0000-0002-8235-7112ImaevaL. P.

IMAEVA Lyudmila Petrovna, candidate of geological and mineralogical sciences, senior researcher

128 Lermontov Street, Irkutsk, 664033

imaeva@crust.irk.ruGusevG. S.

GUSEV Grigory Stepanovich, doctor of geological and mineralogical sciences, chief researcher

15 Veresaev Street, Moscow, 121357

gusev@imgre.ruhttps://orcid.org/0000-0002-6510-0526ImaevV. S.

IMAEV Valery Suleymanovich, doctor of geological and mineralogical sciences, professor, chief researcher, 128 Lermontov Street, Irkutsk, 664033;

academic, 33 Lenin Avenue, Yakutsk, 677007

imaev@crust.irk.ruInstitute of the Earth’s Crust SB of RASRussian FederationInstitute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements RASRussian FederationInstitute of the Earth’s Crust SB of RAS; Academy of Sciences of the Republic of Sakha (Yakutia)Russian Federation202024092023252726Copyright © Imaeva L.P., Gusev G.S., Imaev V.S., 20232023Imaeva L.P., Gusev G.S., Imaev V.S.Imaeva L.P., Gusev G.S., Imaev V.S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://resar.elpub.ru/jour/article/view/226

In the northern sector of the Verkhoyansk fold system, tectonic structures are separated by crustal geoblocks of different ages, which belong to the Siberian platform and the Mesozoic Laptev Sea plate. These geoblocks are key objects of studies aimed at clarifying the evolution of the transitional ‘continent-shelf’ zone of the Arctic boundary between the Eurasian and North American lithospheric plates. Our study focused on the northern sector of the Verkhoyansk fold system and aimed to clarify regularities of seismotectonic destruction of the crust. We analyzed the seismotectonic data on neotectonic structures located in the Kharaulakh segment and the Lena River Delta, geological and geophysical structural features, active faults, modern structural plans, and the dynamic characteristics of the present-day terrain. Based on the comprehensive analysis of the study results, we identified for the first time a system of conjugated active strike-slip faults that reflect the structural plan of the northern sector of the Verkhoyansk fold system. In the sublongitudinal direction along the Ust-Lena right-lateral strikeslip fault, a structural boundary is traced as a major element of the kinematic plan of the modern structures, which predetermines the seismotectonic parameters of the zones of increased seismic activity. In small-scale geological and tectonic maps, as well as in satellite images, the Ust-Lena fault is structurally manifested from the Lena River Delta to the Orulgan segment of the Verkhoyansk fold system. The Bulun fields of earthquake epicenters (Mw = 6.8–7.0) and a wide zone of seismic dislocations varying in genesis are located at the southeastern termination of this fault. We analyzed the state of crustal stress across the study area using the tectonophysical data on the Late Cenozoic rupturing and folding deformations along with seismological data, and conclude that this is a unique transitional region wherein the mid-oceanic and continental crustal structures are conjugated, and the tectonic stress field changes from extension to compression. This study clarifies the kinematic plan of the modern structures in the shelfcontinent transition zone of the Arctic boundary between the Eurasian and North American lithospheric plates. The study results can be useful for Arctic shelf development projects of Russian and foreign companies.

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The authors declare that there are no conflicts of interest present.