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The Southeastern Flank of the Knipovich Ridge (Northern Atlantic): The Basement Structure and Neotectonics from Geophysical Data and Experimental Modelingстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 17 апреля 2024 г.
- Авторы: Sokolov S.Yu, Agranov G.D., Shkarubo S.I., Grokholsky A.L.
- Журнал: Geotectonics
- Том: 57
- Номер: 1
- Год издания: 2023
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 66
- Последняя страница: 81
- DOI: 10.1134/S0016852123010065
- Аннотация: Abstract—The acoustic basement of the Knipovich Ridge southeastern flank was interpreted on the timedomain CDP seismic sections and calibration of Bouguer gravity anomalies to depth was done with construction of basement structural map for the area with an oceanic crust type. On this map, to the east from Knipovich Ridge, there is a longitudinal uplift, which is the northern continuation of the Senja fracture zone and interpreted as a transverse ridge on the transform fault board. This uplift is framed by linear clusters of the offaxis seismicity epicenters, indicating the activation of this area structures. The CDP seismic data above the identified uplift show deformations of the Pliocene‒Quaternary sedimentary cover with reverse fault and shear kinematics. Physical modeling of structure formation in the area of the Knipovich Ridge clearly demonstrated the features of the main tectonic elements during oblique spreading. The result, which is especially close to reality, was obtained by conducting combined experiments with bending the weakened zone to large angles between the direction of stretching and perpendicular to the axis of the weakened zone. At the same time, the appearance of typical accretion swells and nontransform axis displacements simulating the structures of the southeastern flank of the Knipovich Ridge is close to reality. The series of experiments conducted to study the possible formation of the spreading axis jump in an easterly direction to the continuation of the Senja fracture zone showed the fundamental possibility of this structure activation, which we consider as one of the reasons for the formation of features observed in geophysical data. The current position of the active zones of the region, seismicity, the structure of the basement and the structure of the sedimentary cover indicate a shift in the activity of the main tectonic elements in the eastern direction relative to the current position of the extension axis. A likely scenario for further development of the region is the transformation of the Knipovich Ridge into one or the series of transform faults parallel to the western edge of the Barents Sea shelf and the series of short spreading segments between them.Keywords: Knipovich Ridge, transform fault, spreading, physical modeling, sedimentary cover deformations, seismicity, Bouguer anomalies, structure activation
- Добавил в систему: Грохольский Андрей Львович