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Russian Geology and Geophysics

2020 year, number 11

GEODYNAMIC CHARACTERISTICS OF NEOTECTONIC STRUCTURES IN THE OLENEK AND VILYUI AREAS OF THE YAKUTIAN KIMBERLITE PROVINCE

L.P. Imaeva1, V.S. Imaev1,2, B.M. Kozmin3
1Institute of the Earths Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia
2Academy of Sciences of the Sakha Republic (Yakutia), pr. Lenina 33, Yakutsk, 677007, Russia
3Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences, pr. Lenina 39, Yakutsk, 677077, Russia
Keywords: Kimberlite province, kimberlite fields, active faults, kinematic types, geodynamic characteristics, earthquake mechanism, seismotectonic deformations, potential seismicity, environmental hazard

Abstract

The first comprehensive seismotectonic study was performed in the Olenek and Vilyui areas of the Yakutian kimberlite province, which was aimed at elucidating the geodynamic activity of neotectonic structures of the Siberian craton and assessing the environmental hazard of groups of kimberlite fields. Based on the degree of activity and trend of geodynamic processes, we have developed regional principles for the classification of neotectonic structures of the Siberian craton and its fold-thrust framing with the rationale for their differentiation into classes. The active segments of the Verkhoyansk and Baikal-Patom fold-thrust belts are analyzed, which have a dynamic effect on the mode of tectonic deformations of the adjacent sections of the Siberian Platform, where groups of kimberlite fields are localized. The revealed patterns of seismotectonic destruction processes made it possible to establish the intensity and types of the Earths crust stresses and strains in the reactivation zones of the marginal sutures of the Siberian craton. Applying mathematical statistics methods permitted a quantitative analysis of the geodynamic parameters of the geologic environment in the Olenek and Vilyui areas of the Yakutian kimberlite province, based on the significant factors responsible for activation of the recent structures as manifestations of a single stress accumulation/discharge process in the Earths crust. Using the set of seismotectonic data, we have differentiated the activation zones according to the stress-strain intensity in the Earths crust and have assessed the potential environmental hazard of groups of kimberlite fields in the Yakutian diamondiferous province.

DOI: 10.15372/RGG2020107