Discontinuous Fault Structures in the Junction Zone of the East European Platform and the Crimean Segment of the Scythian Plate along the DOBRE-5 DSS Profile

Abstract

The geological interpretation of the velocity model for the DOBRE-5 deep seismic sounding profile, which runs across Fore-Dobrogea, the northwestern shelf of the Black Sea, and the Crimean Peninsula, resulted in the recognition of several major fault zones. The first zone consists of a system of closely spaced listric normal faults that gently dip S–SE and are interpreted as the structural expression of the suture between the East European Platform and Crimean segment of the Scythian Plate. The second and third zones, which were established for the first time, are thrust-type structures—the Upper and Lower Central Crimean thrusts. The admissible variants of the attitudes of these faults were analyzed and the kinematic settings of their formation were reconstructed by tectonophysical analysis on stereographic nets. It was demonstrated that the inception and subsequent activation events of the junction zone of platforms of different age and the Central Crimean thrust fault system took place in alternating (inverse) kinematic settings of ~N–S longitudinal compression and crustal extension. The chronological order of changes of the kinematic settings and periods, in which a certain setting was predominant, is governed by crustal oscillation cyclicity, expressed in the composition and areal extent of the platform sequences of the Crimean Plain and northern Black Sea coast. The crustal oscillation cyclicity, based on a comparison with paleogeodynamic reconstructions of the Mediterranean Belt, is governed by trends in the evolution of back-arc basins of Neo-Tethys extending along the southern margin of Eurasia in front of subduction zones that existed during the initial periods of the Alpine stage at various distances from the study area.

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ACKNOWLEDGMENTS

We are deeply indebted to our colleagues from the Subbotin Institute of Geophysics, National Academy of Sciences of Ukraine, for participation in velocity model interpretation within the DOBRE-5 Project and to M.N. Shoupletsova, the editor of the journal (Geological Institute, Russian Academy of Sciences, Moscow), for the meaningful participation in preparing this paper for publication.

We thank our anonymous reviewers for constructive comments, which contributed to the improvement of this paper.

Funding

The study was supported partially by the Russian Foundation for Basin Research (project no. 16-05-00996) and the Ministry of Science and Higher Education of the Russian Federation.

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Correspondence to Yu. M. Volfman.

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Translated by E. Murashova

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Volfman, Y.M., Kolesnikova, E.Y. Discontinuous Fault Structures in the Junction Zone of the East European Platform and the Crimean Segment of the Scythian Plate along the DOBRE-5 DSS Profile. Geotecton. 54, 754–770 (2020). https://doi.org/10.1134/S001685212006014X

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Keywords:

  • deep seismic sounding
  • junction zone of the East European Platform and Scythian Plate
  • normal faults
  • thrusts
  • faults
  • compression and extension settings
  • tectonic stress field