Seismotectonics of the northern sector of the Verkhoyansk fold system (northeast of the Russian Arctic)
https://doi.org/10.31242/2618-9712-2020-25-2-1
Аннотация
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.
Ключевые слова
Arctic segment of the boundary between the Eurasian and North American lithospheric plates,
northern sector of the Verkhoyansk fold system,
continent-shelf zone,
modern structures,
active faults,
kinematic types,
earthquake focal mechanism,
seismotectonic deformations,
tectonic stress types,
dynamic model of modern structures
При поддержке: The studies were carried out under the RFBR Project 19–05–00062 – Dynamics of the modern structures of the continental-shelf zone in the northeastern sector of the Russian Arctic.
Об авторах
L. P. Imaeva
Institute of the Earth’s Crust SB of RAS
Россия
Россия
IMAEVA Lyudmila Petrovna, candidate of geological and mineralogical sciences, senior researcher
128 Lermontov Street, Irkutsk, 664033
G. S. Gusev
Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements RAS
Россия
Россия
GUSEV Grigory Stepanovich, doctor of geological and mineralogical sciences, chief researcher
15 Veresaev Street, Moscow, 121357
V. S. Imaev
Institute of the Earth’s Crust SB of RAS;
Academy of Sciences of the Republic of Sakha (Yakutia)
Россия
Россия
IMAEV Valery Suleymanovich, doctor of geological and mineralogical sciences, professor, chief researcher, 128 Lermontov Street, Irkutsk, 664033;
academic, 33 Lenin Avenue, Yakutsk, 677007
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Рецензия
Для цитирования:
Imaeva L.P., Gusev G.S., Imaev V.S. Seismotectonics of the northern sector of the Verkhoyansk fold system (northeast of the Russian Arctic). Природные ресурсы Арктики и Субарктики. 2020;25(2):7-26. https://doi.org/10.31242/2618-9712-2020-25-2-1
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