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

Abstract

Skole Nappe (Poland). The heavy mineral composition of the Krosno Formation in the Skole Nappe points to a metamorphic origin, mainly from pelites affected by amphibolite facies conditions. The Krosno Formation was deposited at least partly as a result of the uplift of the Sanok Island, whose petrography and geological affiliation remain enigmatic. This island was probably built of metamorphic and/or sedimentary rocks belonging to a pre-Alpine-uplifted ridge and its cover, exhumed in the transpression belt of the Węglówka Ridge, an interbasinal ridge located between the Skole and Silesian basins. Chemical composition of provenance sensitive minerals from the Krosno Formation suggests that their parent rocks could be genetically related to the Variscan system of ridges in the Carpathian region.

Provenance of Oligocene lithic and quartz arenites of the East Carpathians: Understanding sediment routing systems on compressional basin margins

“…(a) Palaeogeographical reconstruction during Oligocene illustrating the possible drainage routes associated with the depositional systems Fusaru and Kliwa, as well as the turbidites morphology in the Moldavides Basin, based on the integration of the current study results and the previous comprehensive studies: litho‐stratigraphical (Kovác et al, 2017; Popov et al, 2004; Salata & Uchman, 2019; Saulea et al, 1969) tectono‐stratigraphical (Barrier et al, 2018; Van Hinsbergen et al, 2020—grey lines framework) and thermochronological (Fügenschuh & Schmid, 2005; Kounov & Schmid, 2012; Merten et al, 2010; Necea et al, 2021; Sanders et al, 1999). The turbidites system configuration has been interpreted based on sedimentological and palaeocurrents measurements acquired during this study and completed with those of (Contescu et al, 1966; Jipa, 1966); (b) Sketch showing the basin configuration during Oligocene‐Miocene times, illustrating the advancing of the Carpathian indenter over the subducting plate.…”