0145581 - GLU-S 20023218 RIV GB eng M - Monography Chapter
Marheine, D. - Kachlík, V. - Maluski, H. - Patočka, František - Zelazniewicz, A.
The Ar-Ar ages from the West Sudetes (NE Bohemian Massif): constraints on the Variscan polyphase tectonothermal development.
1-86239-118-1. In: Palaeozoic Amalgamation of Central Europe. London: Geological Society of London, 2002 - (Winchester, J.; Pharaoh, T.; Verniers, J.), s. 133-155. Special Publications., 201
R&D Projects: GA AV ČR IAA3111102
Institutional research plan: CEZ:AV0Z3013912
Keywords : tectonothermal development * 40Ar/39Ar ages * European Variscides
Subject RIV: DB - Geology ; Mineralogy

The polyphase Variscan tectonothermal development of the West Sudetes (NE margin of the Bohemian Massif) was precised by 40Ar/39Ar ages. Late Famennian (359 Ma) mica ages from the high-grade Góry Sowie Block suggest continuous uplift after a Late Devonian HT-LP event contemporaneous with the end of subduction-related HP-LT metamorphism in the East Krkonoše Complex. (Mid-)/Late Devonian HP-events in the Krkonoše-Jizera Terrane and Orlica-Sniežnik Dome are followed by coeval HT-events between 345 and 335 Ma (Visean). The latter are interpreted as consequence of uplift, and decompression during overthrusting of both complexes on their forelands. Subsequent small- to large-scale shear movements dated at around 325-320 Ma (early Namurian) affected the West Sudetes and were accompanied by contemporaneous emplacement of the Krkonoše-Jizera pluton. The upper limit of the tectonometamorphic and magmatic activity is dated at 314-312 Ma (Namurian/Westphalian boundary). The final juxtaposition of the diversified tectonometamorphic units, which constitute the West Sudetes, took place in early Namurian times.
Permanent Link: http://hdl.handle.net/11104/0043158