Age constraints on the Pre-Variscan and Variscan thermal events in the Kamieniec Ząbkowicki Metamorphic belt (the Fore-Sudetic Block, SW Poland)

0532045 - GLÚ 2021 RIV PL eng J - Journal Article
Jastrzębski, M. - Zelazniewicz, A. - Budzyń, B. - Sláma, Jiří - Konečný, P.
Age constraints on the Pre-Variscan and Variscan thermal events in the Kamieniec Ząbkowicki Metamorphic belt (the Fore-Sudetic Block, SW Poland).
Annales Societatis Geologorum Poloniae. Roč. 90, č. 1 (2020), s. 27-49. ISSN 0208-9068
Institutional support: RVO:67985831
Keywords : U-Pb geochronology * LA-ICP-MS dating * U-Th-total Pb geochronology * EPMA dating * microplates of the Bohemian Massif * Kamieniec Ząbkowicki Metamorphic Belt * Variscan metamorphism
OECD category: Geology
Impact factor: 1.333, year: 2020
Method of publishing: Open access
https://geojournals.pgi.gov.pl/asgp/article/view/28567

The Kamieniec Ząbkowicki Metamorphic Belt (KZMB) is a narrow zone of mainly mica schists, subordinate
acid metavolcanics and scarce eclogites, sandwiched between Brunovistulia and the northern tip of the
Teplá-Barrandia microplates. Locally occurring high-pressure relics indicate subduction of the metasedimentary
succession of the KZMB, the origin and provenance of which remain unclear. Laser ablation-inductively coupled
plasma-mass spectrometry (LA-ICP-MS) investigations of detrital zircons show that the metapelites represent an
Ediacaran-Cambrian sedimentary basin, with a maximum depositional age of 561±9 Ma. This basin was filled with
detritus from a source or sources, composed of rocks containing zircons that are mainly Cryogenian-Ediacaran
and Palaeoproterozoic in age. No younger component was found in the zircon population studied. The isotopic
U-Pb LA-ICP-MS and chemical U-Th-total Pb electron probe microanalysis (EPMA) monazite geochronology
data indicate an important regional tectono-metamorphic event at ca. 330 Ma. Though these data do not permit
determination of the peak pressure from the peak temperature stages, the event was part of a complex collision of
the Saxothuringian plate with Brunovistulia.
Permanent Link: http://hdl.handle.net/11104/0310663