Number of the records: 1
The eastern part of the Saxothuringian Terrane characterized by zircon and monazite data from the Doboszowice Metamorphic Complex in the Sudetes (SW Poland)
- 1.
SYSNO ASEP 0578845 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The eastern part of the Saxothuringian Terrane characterized by zircon and monazite data from the Doboszowice Metamorphic Complex in the Sudetes (SW Poland) Author(s) Jastrzębski, M. (PL)
Żelaźniewicz, A. (PL)
Stawikowski, W. (PL)
Budzyń, B. (PL)
Krzemińska, E. (PL)
Machowiak, K. (PL)
Madej, S. (PL)
Białek, D. (PL)
Sláma, Jiří (GLU-S) SAI, RID, ORCID
Czupyt, Z. (PL)
Jaźwa, A. (PL)Source Title Annales Societatis Geologorum Poloniae. - : Polskie Towarzystwo Geologiczne - ISSN 0208-9068
Roč. 93, č. 3 (2023), s. 229-249Number of pages 22 s. Language eng - English Country PL - Poland Keywords Bohemian Massif ; Doboszowice Metamorphic Complex ; Saxothuringian Terrane ; isotope geochronology ; Cambro-Ordovician magmatism ; Variscan collision OECD category Geology Method of publishing Open access Institutional support GLU-S - RVO:67985831 UT WOS 001026644300001 EID SCOPUS 85173686656 DOI 10.14241/asgp.2023.11 Annotation In the Variscan Bohemian Massif, orthogneiss complexes of different sizes, derived from early Palaeozoic granitoids, are accompanied by metavolcano-sedimentary successions. They are common in the Sudetes, SW Poland, and belong mainly to the Saxothuringian Terrane. In order to better characterize the evolution of the latter, new U-Pb and O isotopic zircon analyses, combined with zircon typology and new U-Th-Pb isotopic monazite analyses, were performed. The present data show that the S-type granitic precursors of the Doboszowice orthogneisses (Fore-Sudetic Block) and the Śnieżnik gneisses (Sudetes) were formed at ca. 495 Ma from differently evolved magmas. Protoliths of the Doboszowice orthogneisses developed entirely in the crust, whereas the precursors to the Śnieżnik gneisses received some mantle input. Metasediments that accompany the Doboszowice orthogneisses reveal zircon spectra, which point to a late Cambrian-Early Ordovician sedimentary age. These spectra, in addition to predominant grains with Ediacaran ages, contain up to 10% of zircons dated at ca. 1.0 Ga. Therefore, it is suggested that the parent basin was supplied with detritus coming from areas, located in the Libyan- Nubian part of North Africa. Using also earlier published data, such a provenance is assigned to the units that now occur in the eastern part of the Fore-Sudetic Block. Late Cambrian-Early Ordovician granite intrusions and the concurrent accumulation of sediments originated in an extensional setting of the peri-Gondwana rifted continental margin or a back-arc setting. The Pb/U and Pb/Th monazite data constrain the ca. 346–341-Ma peak of the Variscan regional metamorphism in the eastern Saxothuringian Terrane and the prolonged juxtaposition of now adjacent tectonic units at least until 330 Ma. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2024 Electronic address https://geojournals.pgi.gov.pl/asgp/article/view/33798
Number of the records: 1