Questions regarding the interpretation of the complex lithosphere model along the RomUkrSeis profile

• Date: 2025
• Main Authors: Burakhovych, T.K., Makarenko, I.B.
• Format: Article
• Language: Ukrainian
• Published: S. Subbotin Institute of Geophysics of the NAS of Ukraine 2025
• Subjects: complex model of the lithosphere; RomUkrSeis profile; nature of electrical conductivity anomalies; Teisseire-Tornquist zone; lithosphere-asthenosphere boundary; deep faults
• Online Access: https://journals.uran.ua/geofizicheskiy/article/view/327379
• Journal Title: Geofizicheskiy Zhurnal

The article considers some issues regarding interpretative the complex geological and geophysical model of the lithosphere along the RomUkrSeis profile. This concerns the nature of anomalous electrical conductivity in the Earth’s crust and upper mantle; an overview of ideas about the depth of the lithosphere-asthenosphere boundary of tectonic structures of different ages; the location and depth distribution of the Teisseire-Tornquist zone; the possibilities of deep faults tracing on the example of the Transcarpathian fault. We establish and consider the connection and nature of electrical conductivity anomalies with structural features revealed by the data of the DSS and the density heterogeneity of the Earth’s crust. It is shown that electrical conductivity anomalies have an electron-fluid nature. It was found that existing data on the depth of the lithosphere-asthenosphere boundary along the RomUkrSeis profile indicate significant fluctuations in its depth in accordance with different tectonic structures and prove the deepening of the asthenosphere’s roof from the Pannonian Basin towards the East European Platform. Modern, multifaceted representations testify to mantle upwelling centered in the Transylvanian Basin, proving the existence of a separate lithospheric zone according to a complex geological-geophysical interpretation model. It is proposed to consider the Teisseire-Tornquist zone as a complex structure 80—110 km wide, characterized by an almost subvertical position with depth (or with a slope to the northeast, which corresponds to the subvertical mantle boundary) and identified with the transition area between tectonic regions of different ages — the Carpathian-Pannonian and the East European platform. The physical parameters of horizontal geophysical heterogeneities and subvertical or inclined contacts between them can be the basis for the delineation of deep faults and their zones, the development of which is determined by the interaction of superficial and deep structures of the lithosphere. We weigh the geological and geophysical data on the extensions of the Transcarpathian deep fault into the Romanian territory and conclude that there are no such extensions.