Morphotectonics, Deformations of Loose Sediments, and Stages  of Tectonic Activation of the Sambian (Kaliningrad) Peninsula in the Late Pleistocene and Holocene

Shvarev, S.V.

Автор: Shvarev S.V.
Журнал: Doklady Earth Sciences
Том: 506
Номер: Suppl. 1
Год издания: 2022
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 94
Последняя страница: 107
Оригинальные версии: МОРФОТEКТОНИКА, ДЕФОРМАЦИИ РЫХЛЫХ ОТЛОЖЕНИЙ И ЭТАПЫ ТЕКТОНИЧЕСКОЙ АКТИВИЗАЦИИ САМБИЙСКОГО (КАЛИНИНГРАДСКОГО) ПОЛУОСТРОВА В ПОЗДНЕМ ПЛЕЙСТОЦЕНЕ И ГОЛОЦЕНЕ
DOI: 10.1134/S1028334X22700167
Аннотация: The newest block-fault structure is revealed, and tectonic deformations exposed in coastal cliffs are studied and systematized as a result of morphotectonic studies on the territory of the Sambian (Kaliningrad) peninsula. The conjugation of multidirectional systems of morpholineaments is established in the morphostructure of the peninsula, defining the “block” tectonics of the peninsula with different roles in relief:(a) sublatitudinal and meridional systems predominate on the flanks, associated with the formation of the Gotland–Baltic graben system; (b) in the axial part of the peninsula, the NW system controlling the main Holocene uplift; (c) in the northeastern part, the NNW system determining the development of the Curonian Lagoon; and (d) in the southwestern part, the NE system setting the master plan of the Vistula depression.Deformations in loose sediments have been studied on the western and northern shores of the peninsula:(a) faults, including normal faults, reverse faults, and thrusts with an amplitude from centimeters to severalmeters; (b) folds, from micro-folds to gentle synclines with an amplitude of up to meters and a width of up toa few hundred of meters and compressed anticlines; (c) liquefaction, including deformation horizons, local homogenization, intralayer fragmentation, clastic dikes, associated with earthquakes of different strengths. Spatial and chronological relationships between sedimentation and deformations are established, indicatingfive stages of tectonic activation on the territory of the peninsula: (1) Saale (Moscow) late glacial (weakly active); (2) post-Saale (Moscovian) (maximally active); (3) late-Eemian–pre-Weichselian (Mikulinskii–pre-Valdai) (active); (4) late glacial–early Holocene (weakly active); and (5) late Holocene (weakly active). The most intense tectonic movements were at the post-Saalian (Moscovian) stage: the amplitudes of verticalfault displacements reached the a few tens of meters, and the thickness of the liquefaction horizons exceeded1 m. At later stages, the intensity decreased, manifested in a decrease in the amplitudes of displacements to a few decimeters at the pre-Weichselian (pre-Valdai) stage and to the first centimeters in the Holocene.
Добавил в систему: Шварев Сергей Валентинович

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Morphotectonics, Deformations of Loose Sediments, and Stages of Tectonic Activation of the Sambian (Kaliningrad) Peninsula in the Late Pleistocene and Holoceneстатья

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