Re-assessment of lithostratigraphy, biostratigraphy, and volcanic activity of the Late Paleozoic Intra-Sudetic, Krkonoše-Piedmont and Mnichovo Hradiště basins (Czech Republic) based on new U-Pb CA-ID-TIMS ages

Biotic changes around the radioisotopically constrained Carboniferous-Permian boundary in the Boskovice Basin (Czech Republic)

“…Assuming the duration of each of these fish zones is~2-3 Ma (Štamberg 2014), they together represent the interval from late Gzhelian to late Asselian. This conclusion is in agreement with the high-resolution U-Pb isotopic ages of embedded volcanic rocks in the Intra-Sudetic and Krkonoše-Piedmont basins (Opluštil et al 2016b). These volcanic rocks accompany the youngest fish-bearing lacustrine horizons (Kalná and Ruprechtice) assigned to the Xenacanthus decheni Zone and all three samples provided late Asselian ages between 296.49 ± 0.08 and 297.13 ± 0.04.…”

“…The above-described succession of vegetation patterns and plant assemblages around the Carboniferous-Permian transition is not unique to the Boskovice Basin but has been observed elsewhere in Europe and North America where this transition is preserved (Broutin et al 1990(Broutin et al , 1992Château-neuf et al 1992;DiMichele et al 2001DiMichele et al , 2005DiMichele et al , 2007Barthel & Rößler 2012, Opluštil et al 2016b). This trend is characterised by a general decline of "Carboniferous-type" wetlands flora and increasing importance of walchian conifer-peltasperm floras (Kerp 1996(Kerp , 2000DiMichele et al 2005DiMichele et al , 2008DiMichele et al , 2009DiMichele 2014;Looy et al 2014).…”

“…Poor definition in comparison to older zones results from limited availability of fossiliferous successions, in which these biozones are completely preserved in context with the under/overlying ones and thus allowing much wider and reliable correlations among European basins. In addition, the fossil record across the CarboniferousPermian transition is concentrated mainly into discrete, usually lacustrine horizons (Opluštil et al 2016b), and is thus less continuous compared to the Early to Middle Pennsylvanian coal-bearing strata. Except for Kozur's (1980) zonation based on the succession of callipteris flora, that has not been widely accepted (Kerp 1988), no other reliable macrofloral biozones exist above the youngest and poorly constrained Annularia spicata Zone of Wagner & Álvarez-Vázquez (2010).…”

“…Detailed comparison is, however, beyond the scope of this study, partly because of absence of precise radioisotopic data to establish high-resolution correlation between individual areas. Currently only the Intra-Sudetic Basin in the northern part of the Czech Republic provides the comparably high stratigraphic resolution and data for comparison (Opluštil et al 2016b). In the Intra-Sudetic Basin the radioisotopically constrained Carboniferous-Permian transition is recorded in the Chvaleč and Broumov formations, the floras and fish faunas of which are equivalent to the entire Boskovice Basin succession.…”

Multiphase magmatic activity in the Variscan Kłodzko–Złoty Stok intrusion, Polish Sudetes: evidence from SHRIMP U–Pb zircon ages

“…7 Map of the post-collisional igneous activity in the Sudetes. Abbreviations and sources of ages: KJG Karkonosze-Jizera granite , SSM Strzegom-Sobótka Massif (Turniak et al 2014), ŽP Žulova pluton (Laurent et al 2014), SM Strzelin Massif (Oberc-Dziedzic and Kryza 2012), NSB North-Sudetic Basin (Awdankiewicz et al 2014), ISB Intra-Sudetic Basin (Oplustil et al 2016), SBF and ISF Sudetic boundary and intraSudetic faults. Note the pluton age progression from NW toward ES along the faults.…”