Structural and Lithological Comparison of Convolutions in Lacustrine Complexes (Q3-4) of the Baltic Shield, Northern Yakutia, Tien Shan

Gorbatov, E.S.; Kolesnikov, S.F.; Korzhenkov, A.M.; Vardanyan, H.A.

Авторы: Gorbatov E.S., Kolesnikov S.F., Korzhenkov A.M., Vardanyan H.A.
Журнал: Seismic Instruments
Том: 57
Номер: 6
Год издания: 2021
Первая страница: 714
Последняя страница: 729
Оригинальные версии: Структурно-литологическое сравнение конволюций в озерных комплексах (Q3-4) Балтийского щита, Северной Якутии, Тянь-Шаня
DOI: 10.3103/S0747923921060037
Аннотация: In order to clarify the genesis of liquefaction folds (convolutions) developed at lithological boundaries in lacustrine sediments, such structures in three regions were compared. Folds in each region differ in morphology, composition of sediments, and the vertical gradient of their density and viscosity upon deformation. It is proposed to use the ratio of the widths of syn- and anticlinal folds in the convolution horizon (KS) to analyze the latter, in which KS > 1 corresponds to the normal viscosity gradient, and KS < 1, to its inversion. Convolutions of the Baltic Shield and Yakutia from KS ≥ 1 are noted in the most liquefied sediments with unstable density stratification (sands-on-silts), which indicates the possibility of their spontaneous formation during lithogenesis. Folds with KS ≈ 1 are widespread in Yakutia, which indicates their cryogenic genesis. Convolutions in the Tien Shan were formed with stable sediment stratification in terms of density (silts-on-sands); low-fluidized coarse-grained sediments with viscosity inversion were also involved in deformation. These features indicate the seismic initiation of liquefaction processes. The results substantiate the lithogenic genesis of convolutions in lacustrine complexes of the Baltic Shield, cryogenic and lithogenic in Yakutia, and seismogenic in the Tien Shan. It is proposed to determine the scatter of the KS value in the diagrams for diagnosing the genesis of convolutions. For lithogenic structures, this parameter is shifted to the region with KS > 1, and for seismites, it is relatively symmetric with respect to KS = 1.
Добавил в систему: Корженков Андрей Михайлович

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Structural and Lithological Comparison of Convolutions in Lacustrine Complexes (Q3-4) of the Baltic Shield, Northern Yakutia, Tien Shanстатья

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