caa a22 4500 606149007 CHVBK 20210128105226.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00531-014-1055-0 doi (NATIONALLICENCE)springer-10.1007/s00531-014-1055-0 The volcano-sedimentary evolution of a post-Variscan intramontane basin in the Swiss Alps (Glarus Verrucano) as revealed by zircon U-Pb age dating and Hf isotope geochemistry [Elektronische Daten] [Dominik Letsch, Wilfried Winkler, Albrecht von Quadt, Daniela Gallhofer] The Late Palaeozoic Glarus Verrucano basin (GVB, Glarus Alps, eastern Switzerland) formed as an intramontane graben in the aftermath of the Variscan orogeny. Its fill, the Glarus Verrucano, consists of immature alluvial fan and playa lake deposits with intercalated bimodal volcanics (basalts and rhyolites). Despite its importance for local and regional geology, no modern sedimentologic or stratigraphic studies on the GVB exist. By means of sedimentologic and geochronologic studies, we reconstruct the volcano-sedimentary evolution of the GVB: it developed at the Carboniferous/Permian boundary and experienced a first (bimodal) volcanic phase around 285Ma. For the same time, indications for temporarily humid climate in the otherwise rather arid Early Permian are demonstrated (e.g. pyrite-bearing sandstones). During the Middle and Early Late Permian, increasing aridity is indicated by playa deposits, fanglomerates and subaerial ignimbrites, which mark a second (silicic) volcanic phase at 268Ma. The detrital zircon age spectra are dominated by Late Variscan ages and thus demonstrate that older sedimentary and metamorphic rocks once forming the Variscan nappe edifice were already mostly eroded at that time. Finally, some larger-scale speculations are given which could indicate a causal connection between the widespread tectono-magmatic Mid-Permian Episode and the local development of the Glarus Verrucano basin. Springer-Verlag Berlin Heidelberg, 2014 Lower Permian nationallicence Swiss Alps nationallicence Detrital zircon ages nationallicence Variscan orogeny nationallicence Bimodal volcanism nationallicence Verrucano nationallicence Red beds nationallicence Basin analysis nationallicence Letsch Dominik Department of Earth Sciences, Geological Institute, ETH Zentrum, Sonneggstrasse 5, 8092, Zurich, Switzerland aut Winkler Wilfried Department of Earth Sciences, Geological Institute, ETH Zentrum, Sonneggstrasse 5, 8092, Zurich, Switzerland aut von Quadt Albrecht Department of Earth Sciences, Geological Institute, ETH Zentrum, Sonneggstrasse 5, 8092, Zurich, Switzerland aut Gallhofer Daniela Department of Earth Sciences, Institute of Geochemistry and Petrology, ETH Zentrum, Clausiusstrasse 25, 8092, Zurich, Switzerland aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/1(2015-01-01), 123-145 1437-3254 104:1<123 2015 104 531 https://doi.org/10.1007/s00531-014-1055-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1055-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Letsch Dominik Department of Earth Sciences, Geological Institute, ETH Zentrum, Sonneggstrasse 5, 8092, Zurich, Switzerland aut NATIONALLICENCE 700 1- Winkler Wilfried Department of Earth Sciences, Geological Institute, ETH Zentrum, Sonneggstrasse 5, 8092, Zurich, Switzerland aut NATIONALLICENCE 700 1- von Quadt Albrecht Department of Earth Sciences, Geological Institute, ETH Zentrum, Sonneggstrasse 5, 8092, Zurich, Switzerland aut NATIONALLICENCE 700 1- Gallhofer Daniela Department of Earth Sciences, Institute of Geochemistry and Petrology, ETH Zentrum, Clausiusstrasse 25, 8092, Zurich, Switzerland aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/1(2015-01-01), 123-145 1437-3254 104:1<123 2015 104 531 SWISSBIB 329908596