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Timing and kinematics of the Variscan orogenic cycle at the Moldanubian periphery of the central Bohemian Massif
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SYSNO ASEP 0556589 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Timing and kinematics of the Variscan orogenic cycle at the Moldanubian periphery of the central Bohemian Massif Author(s) Machek, Matěj (GFU-E) ORCID, RID
Soejono, I. (CZ)
Sláma, Jiří (GLU-S) SAI, RID, ORCID
Žáčková, E. (CZ)Article number jgs2021-096 Source Title Journal of the Geological Society. - : Geological Society Publishing House - ISSN 0016-7649
Roč. 179, č. 3 (2022)Number of pages 18 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords tectonic mode switches ; Teplá - Barrandian unit ; U-PB geochronology ; shear zone ; detrital zircon ; Central Europe ; terrane boundaries ; magma emplacement Subject RIV DB - Geology ; Mineralogy OECD category Geology Subject RIV - cooperation Institute of Geology - Geology ; Mineralogy Method of publishing Limited access Institutional support GFU-E - RVO:67985530 ; GLU-S - RVO:67985831 UT WOS 000788765200001 EID SCOPUS 85125124846 DOI 10.1144/jgs2021-096 Annotation The high-grade metamorphic complexes along the northern Moldanubian periphery of the central Bohemian Massif provide an outstanding structural record of all episodes of the collisional evolution of the Variscan Orogeny. The kinematics and timing of the orogenic processes were examined by structural and microstructural studies of middle and lower crustal rocks combined with xenotime and monazite geochronology. Four distinct tectonic events were identified. A first relict sub-horizontal fabric S1 associated with high-pressure–high-temperature metamorphism was only developed in the lower crustal rocks and was related to back-arc extension or lower crustal flow in a supra-subduction domain. This fabric was completely reworked to the subvertical foliation S2 at c. 340 Ma by major collisional thickening, leading to juxtaposition of the lower and middle crust. Thereafter, extensional collapse of the thickened orogenic system caused strong refolding to the high-temperature sub-horizontal fabric at c. 325 Ma. The region was subsequently affected by NNE–SSW-oriented horizontal shortening related to dextral shearing and the clockwise rotation of crustal blocks adjacent to the large-scale dextral shear zone (the Elbe Zone). This led to fragmentation and reorientation of the Moldanubian margin to its current position. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2023 Electronic address https://pubs.geoscienceworld.org/jgs/article/179/3/jgs2021-096/609829/Timing-and-kinematics-of-the-Variscan-orogenic
Number of the records: 1