Acta Geologica Polonica, Vol. 69 (2019), No. 3, pp. 339–386 DOI: 10.24425/agp.2019.126449 The intramontane Orava Basin – evidence of large-scale Miocene to Quaternary sinistral wrenching in the Alpine-Carpathian-Pannonian area MIROSŁAW LUDWINIAK1,*, MICHAŁ ŚMIGIELSKI1, SEBASTIAN KOWALCZYK1, MACIEJ ŁOZIŃSKI1, URSZULA CZARNIECKA2 and LENA LEWIŃSKA1 1 Faculty of Geology, University of Warsaw, Żwirki i Wigury 93, 02-089 Warsaw, Poland 2 Department of Geosciences, University of Oslo, P.O. Box 1047 Blindern, 0316 Oslo, Norway *corresponding author; e-mail:
[email protected] ABSTRACT: Ludwiniak, M., Śmigielski, M., Kowalczyk, S., Łoziński, M., Czarniecka, U. and Lewińska, L. 2019. The intramontane Orava Basin – evidence of large-scale Miocene to Quaternary sinistral wrenching in the Alpine- Carpathian-Pannonian area. Acta Geologica Polonica, 69 (3), 339−386. Warszawa. The Carpathian Orava Basin is a tectonic structure filled with Neogene and Quaternary deposits superimposed on the collision zone between the ALCAPA and European plates. Tectonic features of the south-eastern margin of the Orava Basin and the adjoining part of the fore-arc Central Carpathian Palaeogene Basin were studied. Field observations of mesoscopic structures, analyses of digital elevation models and geological maps, supple- mented with electrical resistivity tomography surveys were performed. Particular attention was paid to joint network analysis. The NE-SW-trending Krowiarki and Hruštinka-Biela Orava sinistral fault zones were recog- nized as key tectonic features that influenced the Orava Basin development. They constitute the north-eastern part of a larger Mur-Mürz-Žilina fault system that separates the Western Carpathians from the Eastern Alps. The interaction of these sinistral fault zones with the older tectonic structures of the collision zone caused the initiation and further development of the Orava Basin as a strike-slip-related basin.