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Dynamics of the Relief and Seismotectonic Activity of the Modern Structures in the Delta of the River Lena

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Abstract

The paper presents seismogeodynamic analysis of modern structures located in the Lena river delta. These structures are key elements in the tectonic evolution of the shelf–continent transition zone in the Arctic segment of the boundary between the Eurasian and North American lithospheric plates. The geological structure of the Lena river delta is predetermined by the junction of the ancient Siberian platform and the Mesozoic Laptev Sea plate. These two large geoblocks of the crust, which differ in age, are separated by a fragment of the Kharaulakh segment of the Verkhoyansk fold system. In our study aimed to reveal regularities in seismotectonic destruction of the crust, we analyzed the geological and geophysical data on the crustal structure, active faults, modern structural plan, dynamic characteristics of the modern relief, and hydrological features characterizing of the flow redistribution in the Lena riverbed. A system of active faults identified in the Lena river delta shows a contrasting kinematic plan of the junction zone of the main geostructures. According to the analysis results, shear faulting is a dominant factor of impact on the morphologic features and seismogeodynamic activation of the modern structures. A regional right-lateral strike-slip fault of the sublatitudinal strike is traced as a major structural boundary that cuts the Lena river delta into several geodynamic segments. Seismotectonic destruction of the crust in the segments differs in types (transpression, transtension and compression). The above-mentioned fault is not only the main element of the kinematic plan of the newest structures in the Lena river delta – it controls the general structural pattern and seismotectonic parameters of active fault zones in the entire northern sector of the Verkhoyansk marginal suture. The seismogeodynamic analysis results obtained in our study provide a reliable basis for estimating potential seismic hazard of the modern structures in the Lena river delta and updating the available seismic zoning maps of the shelf–continent transition zone in the Arctic segment of the boundary between the Eurasian and North American lithospheric plates.

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Funding

The studies were financed by the Russian Foundation for Basic Research, project no. 19-05-00062; the Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences (SB RAS), project no. 346-2018-0001; the Diamond and Precious Metals Geology Institute, SB RAS, project no. 0381-2616-0001; and the integrated program of the Goverment of the Republic of Sakha (Yakutia).

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Authors and Affiliations

  1. Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, 664033, Irkutsk, Russia

    L. P. Imaeva & V. S. Imaev

  2. Institute of Mineralogy, Geochemistry, and Crystallography of Rare Elements, Russian Academy of Sciences, 121357, Moscow, Russia

    G. S. Gusev

  3. Institute of Geology of Diamonds and Precious Metals, Siberian Branch, Russian Academy of Sciences, 677077, Yakutsk, Russia

    V. S. Imaev

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  1. L. P. Imaeva
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  2. G. S. Gusev
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  3. V. S. Imaev
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Correspondence to L. P. Imaeva.

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Reviewers: V.G. Trifonov, A.N. Ovsyuchenko

Translated by A. Carpenter

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Imaeva, L.P., Gusev, G.S. & Imaev, V.S. Dynamics of the Relief and Seismotectonic Activity of the Modern Structures in the Delta of the River Lena. Geotecton. 53, 588–600 (2019). https://doi.org/10.1134/S0016852119050029

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