RomUkrSeis: Seismic model of the crust and upper mantle across the Eastern 
Carpathians – From the Apuseni Mountains to the Ukrainian Shield

Starostenko, Vitaly; Janik, Tomasz; Mocanu, Victor; Stephenson, Randell; Yegorova, Tamara; Amashukeli, Tatiana; Czuba, Wojciech; Środa, Piotr; Murovskaya, Anna; Kolomiyets, Katerina; Lysynchuk, Dmytro; Okoń, Jan; Dragut, Alina; Omelchenko, Victor; Legostaieva, Olga; Gryn, Dmytro; Mechie, James; Tolkunov, Anatoly

doi:10.1016/j.tecto.2020.228620

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RomUkrSeis: Seismic model of the crust and upper mantle across the Eastern Carpathians – From the Apuseni Mountains to the Ukrainian Shield

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Starostenko, Vitaly
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Janik, Tomasz
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Mocanu, Victor
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Stephenson, Randell
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Yegorova, Tamara
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Amashukeli, Tatiana
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Czuba, Wojciech
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Środa, Piotr
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Murovskaya, Anna
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Kolomiyets, Katerina
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Lysynchuk, Dmytro
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Okoń, Jan
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Dragut, Alina
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Omelchenko, Victor
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Legostaieva, Olga
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Gryn, Dmytro
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Mechie, James
2.2 Geophysical Deep Sounding, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
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Tolkunov, Anatoly
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Zitation

Starostenko, V., Janik, T., Mocanu, V., Stephenson, R., Yegorova, T., Amashukeli, T., Czuba, W., Środa, P., Murovskaya, A., Kolomiyets, K., Lysynchuk, D., Okoń, J., Dragut, A., Omelchenko, V., Legostaieva, O., Gryn, D., Mechie, J., Tolkunov, A. (2020): RomUkrSeis: Seismic model of the crust and upper mantle across the Eastern Carpathians – From the Apuseni Mountains to the Ukrainian Shield. - Tectonophysics, 794, 228620.
https://doi.org/10.1016/j.tecto.2020.228620

Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5003353

Zusammenfassung

RomUkrSeis is a controlled source wide-angle reflection and refraction (WARR) profile acquired in August 2014. It is 675 km long, running roughly SW-NE from the Apuseni Mountains in Romania and the Transylvanian Basin, crossing the arc of the Eastern Carpathian orogen and terminating in the East European Craton (EEC) in SW Ukraine. Well-constrained 2-D ray-tracing P- and partly S-wave velocity models have been constructed along the profile from 348 single-component seismic recorders and eleven shot points. The Eastern Carpathian arc formed in the Cenozoic and have obscured the pre-existing Teisseyre-Tornquist Zone (TTZ), which is a transition zone between the Precambrian EEC and continental terranes accreted to it from the southwest in the Palaeozoic. The TTZ is characterised by low-velocity through its entire crust (6.0–6.3 km/s) and a considerable width (~140 km). It is interpreted as EEC crust stretched during rifting and continental margin formation in the Neoproterozoic and early Palaeozoic. The crust of the TTZ has a “trough in trough” structure wherein an upper body of ~40 km width comprising Outer Carpathian (Vp 4.9 km/s) and Late Palaeozoic-Mesozoic (Vp 5.4 km/s) units to 15 km depth lies above a wider, deeper one of inferred Neoproterozoic-early Palaeozoic strata. The crust of the Transylvanian Basin and Apuseni Mountains is relatively thin (~32 km). A high-velocity body at 4–12 km depth in this area is interpreted as a rootless fragment of an ophiolite complex exposed at the surface in this area. The lower crust beneath the Transylvanian Basin displays higher velocities than adjacent segments. Moho topography is strongly differentiated along the profile, varying from 32 to 50 km. The Moho shape, especially in the area between the Inner and Outer Carpathians, suggests a NE dip and, hence, thrusting of the Tisza-Dacia lowermost crustal and upper mantle units under the TTZ domain which, in turn, could be thrust under the cratonic (EEC) block.