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Details
  • Dr. Piotr Krzywiec, Institute of Geological Sciences,Polish Academy of Sciences, Polònia
  • Date: Oct, 19, 2015 12:00 am
  • Place: Sala d'Actes del Institut de Ciències de la Terra Jaume Almera(ICTJA)
  • Location: C/ Solé i Sabarís s/n, Barcelona
  • Contact: Oriol Ferrer (Facultat de Geologia - UB)
Abstract

The western edge of the East European Craton (EEC) in Poland is limited to the southwest by the Teisseyre–Tornquist Zone (TTZ) that separates it from the Palaeozoic Platform. Seismic data from the recently acquired regional deep reflection survey PolandSPAN integrated with other new and archive seismic data acquired during intense exploration for shale gas, revealed many new tectonic features of the cratonic margin in Poland. The Cambrian - Lower Ordovician succession of the Baltic Basin was deposited on the Baltica passive margin and is covered by the Upper Ordovician - Silurian succession of the Caledonian foredeep basin, and by the Permian to Cretaceous sedimentary cover deposited within the NE flank of the Mid-Polish Trough (MPT). Seismic data from the SE part of the study area has shown for the first time the deep structure of the Lublin Basin (LB). Continuous top-EEC basement was shown to continuously descend from ~2 km in the NE to ~20 km in the SW, beneath the Radom-Krasnik Block (RKB). The RKB and LB represent a NE-vergent thin-skinned Variscan (Late Carboniferous) system thrust toward the EEC. The RKB is a thrust stack that imbricates a 10-12 km thick pile of ?Neoproterozoic to Devonian sediments. Some of Variscan compressional structures were reactivated during the Late Cretaceous inversion of the Mid-Polish Trough. Finally, the deep structure of the Grojec fault zone, an important SW-NE strike-slip fault zone, has also been revealed by the data, demonstrating its relationship with Palaeozoic and Mesozoic-Paleogene tectonic activity.