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Crustal-scale pop-up structure in cratonic lithosphere: DOBRE deep seismic reflection study of the Donbas fold belt, Ukraine

¹ Technology Center, Ukrgeofizika, 10, Perovska, Kyiv 03057, Ukraine, and GeoForschungsZentrum Potsdam, Telegrafenberg C426, Potsdam 14473, Germany
² Technology Center, Ukrgeofizika, 10, Perovska, Kyiv 03057, Ukraine
³ Vrije Universiteit, Faculty of Earth and Life Sciences, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands
⁴ GeoForschungsZentrum Potsdam, Telegrafenberg C425, Potsdam 14473, Germany
⁵ Institute of Geophysics, University of Hamburg, Bundesstrasse 55, Hamburg 20146, Germany
⁶ Institute of Geosciences, Otto-Hahn-Platz 1, 24118 Kiel, Germany
⁷ Vrije Universiteit, Faculty of Earth and Life Sciences, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands
⁸ Institute of Geophysics, National Academy of Sciences of Ukraine, Palladin 32, Kyiv 03680, Ukraine
⁹ Geological Institute, University of Copenhagen, Øster Voldgade 10, Copenhagen 1350, Denmark
¹⁰ Ukrgeofizika, 10, Perovska, Kyiv 03057, Ukraine

The DOBRE project investigated the interplay of geologic and geodynamic processes that controlled the evolution of the Donbas fold belt, Ukraine, as an example of an inverted intracratonic rift basin. A deep seismic reflection profile provides an excellent image of the structure of the Donbas fold belt, which is the uplifted and compressionally deformed part of the late Paleozoic Pripyat-Dniepr-Donets basin. Both the effects of rifting and those of later structural inversion are recognized in the seismic and geologic data. The interpretation of the reflection data shows that the inversion of the Donbas fold belt occurred at the crustal scale as a mega–pop-up, which involved a major detachment fault through the entire crust and an associated back thrust. The DOBREflection image provides a simple concept of intracratonic basin inversion, the crustal pop-up being uplifted and internally deformed. The association of such a structure with inverted intracratonic basins such as the Donbas fold belt implies brittle deformation of relatively cold crust.

Key Words: intracratonic rift • inversion • deep seismic reflection profile • Donbas fold belt • Ukraine

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