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Palaeozoic Amalgamation of Central Europe
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SYSNO ASEP 0145581 Document Type M - Monograph Chapter R&D Document Type Monograph Chapter Title The Ar-Ar ages from the West Sudetes (NE Bohemian Massif): constraints on the Variscan polyphase tectonothermal development Author(s) Marheine, D. (FR)
Kachlík, V. (CZ)
Maluski, H. (FR)
Patočka, František (GLU-S) SAI
Zelazniewicz, A. (PL)ISBN 1-86239-118-1 Source Title Palaeozoic Amalgamation of Central Europe. - London : Geological Society of London, 2002 / Winchester J. A. ; Pharaoh T. C. ; Verniers J. - ISSN 0305-8719 Pages s. 133-155 Number of pages 23 s. Language eng - English Country GB - United Kingdom Keywords tectonothermal development ; 40Ar/39Ar ages ; European Variscides Subject RIV DB - Geology ; Mineralogy R&D Projects IAA3111102 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z3013912 - GLU-S Annotation 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. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Tel.: 226 800 273 Year of Publishing 2003
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