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How many extensional stages marked the Variscan gravitational collapse in the Bohemian Massif?
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SYSNO ASEP 0545975 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title How many extensional stages marked the Variscan gravitational collapse in the Bohemian Massif? Author(s) Bárta, O. (CZ)
Melichar, R. (CZ)
Černý, Jan (GLU-S) RID, ORCID, SAISource Title Annales Societatis Geologorum Poloniae. - : Polskie Towarzystwo Geologiczne - ISSN 0208-9068
Roč. 91, č. 2 (2021), s. 121-136Number of pages 16 s. Publication form Print - P Language eng - English Country PL - Poland Keywords Gravitational collapse ; anisotropy of magnetic susceptibility ; U-Pb zircon geochronology ; Variscan orogen ; Central Bohemian plutonic complex OECD category Geology R&D Projects GJ19-02177Y GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support GLU-S - RVO:67985831 UT WOS 000674745600003 EID SCOPUS 85112328718 DOI 10.14241/asgp.2021.08 Annotation Tectonic development of the Variscan belt in Central Europe included, besides important compression, also an extensional phase related to gravitational collapse, which governed the origin of many sedimentary basins and magmatic bodies. One of these bodies is the Benešov pluton, featuring primary magmatic fabrics as well as deformational fabrics, related to subsequent extensional stages. Recognition of these fabrics and their links to other significant extension-induced structures in the Bohemicum and Moldanubicum not only sheds new light on the pluton itself but also extends a general knowledge of deformational stages, accompanying gravitational collapse of the Variscan orogen. The authors found that this pluton was strongly strained in a normal-faulting regime under brittle-ductile conditions. The age of deformation is constrained by a magmatic age of 347 ±3 Ma and by the age of Carboniferous sedimentary cover. New data indicate a three-stage extensional history during the phase of gravitational collapse: (1) Tournaisian extension (~350–345 Ma) within arc-related tonalitic intrusions, (2) late Viséan to Serpukhovian extension (~332–320 Ma), connected to the brittle-ductile unroofing and origin of a NE–SW basin system, and (3) Gzhelian to Cisuralian extension (~303–280 Ma), related to normal faulting and sedimentation in “Permo–Carboniferous” troughs, elongated NNE–SSW. Consequently, the gravitational collapse studied involved a complex succession of individual extensional stages, rather than a simple process. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2022 Electronic address https://geojournals.pgi.gov.pl/asgp/article/view/32966/24150
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