Structure and tectonic evolution of the NE segment of the Polish-Ukrainian Carpathians during the Late Cenozoic: subsurface cross-sections and palinspastic models

Abstract

Abstract:The discrepant arrangement of the Carpathian nappes and syntectonic deposits of the Carpathian Foredeep reveals the oroclinal migration of the subduction direction of the platform margin during the Late Cenozoic. Formation of the nappes was induced by their detachment from disintegrated segments of the European Platform; the segments were shortened as a result of their vertical rotation in zones of compressional sutures. It finds expression in local occurrence of the backward vergence of folding against the generally forward vergence toward the Carpathian Foredeep. The precompressional configuration of sedimentation areas of particular nappes was reconstructed with application of the palinspastic method, on the basis of the hitherto undervalued model which emphasizes the influence of the subduction and differentiated morphology of the platform basement on the tectonic evolution of the fold and thrust belt. Superposition of the palaeogeographic representations and the present geometry of the orogen allows understanding of the impact of the magnitudes of tectonic displacements on the differentiation of the geological structure in the NE segment of the Carpathians. The differentiation has inspired different views of Polish and Ukrainian geologists on structural classification and evolution of the frontal thrusts.

A 3D model of the thermal field within the Polish Carpathians and the Carpathian Foredeep (S Poland)

“…In the case of the D-1 bore hole (Carpathians), il lus trated in Figure 6A, the dis crep ancy var ies from -0.94 to 2.40°C. These values cor re spond to the ac cu racy of the in dus trial ther mal log ging (see Wioeniewska, 2013;Sikorska-Piekut, 2015, 2016Sowa and Sikorska-Piekut, 2015). This er ror or in ac cu racy is a re sult of av er ag ing dur ing the upscaling pro cess.…”

“…An im por tant fac tor is the ac cu racy and cal i bra tion of ther mom e ters. In the log ging re ports at tached to re cent bore hole re ports (e.g., Wioeniewska, 2013;Sikorska-Piekut, 2015, 2016Sowa and Sikorska-Piekut, 2015), it is stated that the ther mom e ters used for de ter mi na tion of BHT had an ac cu racy of 1°C. Szewczyk (2001) points out that elec tric ther mom e ters, com monly used be tween 1960 and 1985, at tem per a tures >100°C, op er ated at tem per a tures beyond their lin ear char ac ter is tics.…”

Provenance of Upper Oligocene to Lower Miocene Krosno Formation sandstones in the Skole Nappe (southeast Poland): New insights from heavy minerals

“…In the Polish part, they are represented mainly as the Magura, Silesian, Subsilesian, Dukla, and Skole nappes (Figure ). Tectogenesis of the Polish Carpathians is complex and ambiguous in several aspects (see Golonka & Picha, ; Golonka, Waśkowska, & Ślączka, ; Kuśmierek & Baran, ; Oszczypko, , and references therein). Nevertheless, the majority of researchers agree that at least the Skole and Silesian basins in the northern Carpathians originated on a rifted margin of the European Platform in the Late Jurassic and Early Cretaceous.…”