Together but separate: decoupled Variscan (late Carboniferous) and Alpine (Late Cretaceous – Paleogene) inversion tectonics in NW Poland

Abstract

Abstract. In Europe, formation of the Palaeozoic Variscan orogenic belt, and then the Mesozoic-Cenozoic Alpine-Carpathian orogenic belt led to a widespread inversion events within forelands of both orogenic domains. We used legacy 2D seismic data together with the newly acquired 3D seismic data that for the first time precisely imaged sub-Zechstein (i.e. sub-evaporitic) upper Palaeozoic succession in NW Poland in order to develop quantitative, balanced 2D model of the late Palaeozoic – recent evolution of this area, characterised by a complex pattern of repeated extension and inversion. Four main tectonic phases have been determined: (1) Late Devonian – early Carboniferous extension related to extensional reactivation of Caledonian thrusts, (2) late Carboniferous inversion caused by Variscan orogeny, (3) Permo-Mesozoic subsidence related to the development of the Polish Basin, and (4) its Late Cretaceous – Paleogene inversion. Variscan and Alpine structures form superimposed multilayer inversion system, mechanically decoupled along the Zechstein evaporites.

Clustering has a meaning: optimization of angular similarity to detect 3D geometric anomalies in geological terrains

“…10A and 10B. In particular, the structural development of the Permo-Mesozoic Polish Basin is strongly coupled with the Teisseyre-Tornquist Zone, which can be considered as the preexisting lithospheric weak zone beneath this basin (Mazur et al, 2021). The Teisseyre- Tornquist Zone is characterized by two wide zones of low angle dip direction (Fig.…”

“…During the Late Cretaceous-Early Cenozoic, some parts of the CEBS were undergone to basin inversion with the strongest compressive deformations and uplift along the Elbe Fault System, the Sorgenfrei-Tornquist and the Teisseyre-Tornquist zones (Hansen et al, 2000;Krzywiec et al, 2021;Mazur et al, 2005;Mogensen and Jensen, 1994;Otto, 2003;Scheck-Wenderoth and Lamarche, 2005;Voigt et al, 2008;Ziegler, 1990a). During the Cenozoic, broad subsidence occurred within the central part of the North Sea, where more than 3 km of sediments were deposited (Evans et al, 2003;Ziegler, 1990b).…”

“…Dadlez et al, 1995;Słonka and Krzywiec, 2019). The axial part of the Permian-Mesosoic Polish basin is called the mid-Polish trough and strikes parallel to the TTZ (see Mazur et al, 2021 for the latest interpretation of TTZ).…”

First Evidence of the Post-Variscan Magmatic Pulse on the Western Edge of East European Craton: U-Pb Geochronology and Geochemistry of the Dolerite in the Lublin Podlasie Basin, Eastern Poland

“…The alkaline Lublin-Podlasie Mississippian Igneous province after [14], The Volyn Igneous Province after [14,15]. Tectonic framework-compilation after [14,[16][17][18] Mielnik IG1, J-2-Janowice 2, HCM-Holy Cross Mountains, KLZ-Kraków-Lubliniec Zone, MS-Moravian Suture, RS-Rheic Suture, VDF-Variscan Deformation Front, CDF-Caledonian Deformation Front, ACDF-Alpine-Carpathian Deformation Front, ŁB-Łysogóry Block, MB-Małopolska Block, BV-Brunovistulicum.…”