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On Mesozoic uplifts along the SW edge of the East European Craton – new insight from regional onshore (PolandSPAN) and offshore (BalTec) seismic reflection data from Poland

East European Craton (EEC) in Poland has been recently studied by onshore PolandSPAN and offshore BalTec regional seismic surveys. PolandSPAN data imaged earliest Late Jurassic, earliest Late Cretaceous and mid-Late Cretaceous laterally extensive unconformities that document hitherto unknown substantial uplifts of the SW edge of the EEC. Cretaceous unconformities might have been formed as a result of inversion-induced buckling of the cratonic edge. BalTec offshore survey was acquired within the transition zone between the Paleozoic Platform and EEC. SW part of BalTec data imaged offshore segment of the Mid-Polish Swell formed due to inversion of the axial part of the Polish Basin. NE from the MPS, within the Bornholm–Darłowo Fault Zone, system of Late Cretaceous strike-slip syn-depositional faults was documented. E part of the BalTec survey is located above the EEC basement overlain by Cambro-Silurian sedimentary cover that is dissected by a system of steep, mostly reverse faults, regarded so far as having been formed as a result of the Caledonian orogeny. BalTec seismic data proved that at least some of these deeply-rooted faults were active as a reverse faults in latest Cretaceous. This suggests that large Paleozoic blocks might have been uplifted during the widespread Late Cretaceous inversion. Erosion of these blocks might have provided sediments that formed Upper Cretaceous progradational wedges within the onshore Baltic Basin imaged by PolandSPAN data. This study was funded by NCN grants UMO-2017/27/B/ST10/02316 and UMO-2015/17/B/ST10/03411. ION Geophysical is thanked for providing PolandSPAN seismic data, and Kingdom IHS for providing seismic interpretation software.


Piotr Krzywiec1, Łukasz Słonka1, Aleksandra Stachowska1, Quang Nguyen2, Michał Malinowski2, Christian Huebscher3, Regina Kramarska4, Niklas Ahlrichs5
1Institute of Geological Sciences, Polish Academy of Sciences, Poland; 2Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland; 3Institute of Geophysics, University of Hamburg, Hamburg, Germany; 4Polish Geological Institute, Gdańsk, Poland; 5Federal Institute for Geosciences and Resources (BGR), Berlin, Germany
GeoKarlsruhe 2021