Recent dislocations of bedrocks and loose deposits of the southern slope of the Khibiny (Kola Peninsula)
1 Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences
2 Moscow State University of Geodesy and Cartography
Journal: Problems of Engineering Seismology
Tome: 51
Number: 1
Year: 2024
Pages: 66-80
UDK: 550.394.4; 551.243; 551.248.2; 551.332.2
DOI: 10.21455/VIS2024.1-5
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Gorbatov
S.F E.S. Recent dislocations of bedrocks and loose deposits of the southern slope of the Khibiny (Kola Peninsula) // . 2024. Т. 51. № 1. С. 66-80. DOI: 10.21455/VIS2024.1-5
@article{Gorbatov
S.FRecent2024,
author = "Gorbatov
S.F, E. S.",
title = "Recent dislocations of bedrocks and loose deposits of the southern slope of the Khibiny (Kola Peninsula)",
journal = "Problems of Engineering Seismology",
year = 2024,
volume = "51",
number = "1",
pages = "66-80",
doi = "10.21455/VIS2024.1-5",
language = "English"
}
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Keywords: dislocations, tectonic gorges, convolutions, landslide folds, graben-syncline, ground vein, ground subsidence zone, structural unity, paleoseismological analysis, Khibiny alkaline massif
Аnnotation: In the southern part of the Khibiny alkaline massif, a dislocation zone (2×5.5 km) was studied in the form of a system of orthogonal tectonic gorges up to 60 m deep in the area of denudation relief, and a quarry section of fluvioglacial (QIII4v) sand and gravel deposits with a complex of ground disturbances was described for the purpose of analysis genesis and interconnection of these structures. It has been established that tectonic gorges were formed as a result of rock extension in the zone of endocontact of the alkaline pluton and massif segregation, and their age is older than dislocations of Quaternary deposits. In the surveyed section at the foot of Mt. Lovchorr, synchronous landslide and convolute folds of the lithogenic type (in the “sand-on-sand” system) and a linear deformation zone (striking – northeast) in the form of a graben-syncline (the amplitude of subsidence 0.5 m) and a giant syncline superimposed on it (the amplitude of subsidence 4 m), covered by an undisturbed moraine mantle. It is shown that the linear zone of dislocations arose during the accumulation of strata in the body of the sheet glacier, has an increase in the amplitude of vertical displacements from bottom to top along the section, which is uncharacteristic for tectonic faults, and may be the result of glacial karst subsidence of grounds. The results obtained demonstrate the independent formation of dislocations of bedrocks and younger disturbances of loose deposits, even with their compact location, which justifies the need to verify the structural unity of such disturbances on the Baltic Shield in order to prove their seismotectonic genesis.