U-Pb zircon age of the Krásné Loučky tuffite: the dating of Visean flysch in the Moravo-Silesian Paleozoic Basin (Rhenohercynian Zone, Czech Republic)

0443134 - ÚSMH 2015 RIV PL eng J - Článek v odborném periodiku
Jirásek, J. - Wlosok, J. - Sivek, M. - Matýsek, D. - Schmitz, M. - Sýkorová, Ivana - Vašíček, Zdeněk
U-Pb zircon age of the Krásné Loučky tuffite: the dating of Visean flysch in the Moravo-Silesian Paleozoic Basin (Rhenohercynian Zone, Czech Republic).
Geological Quarterly. Roč. 58, č. 4 (2014), s. 659-672. ISSN 1641-7291. E-ISSN 2082-5099
Institucionální podpora: RVO:67985891 ; RVO:68145535
Klíčová slova: volcaniclastic sediment * Horni Benesov Formation * Variscan foreland * Visean * Carboniferous
Kód oboru RIV: DB - Geologie a mineralogie
Impakt faktor: 1.000, rok: 2014
https://gq.pgi.gov.pl/article/view/13084/pdf_1194

The only previous U-Pb zircon date for the the Early Carboniferous flysch sequence of the Moravo-Silesian Paleozoic Basin was published in 1987 from tuffogenic material from Kobylí Quarry at Krásné Loučky near the town of Krnov (Silesia, Czech Republic). The measured age of 319 Ma did not agree with its stratigraphic position, and was used as the basis for a hypothesized block of Late Carboniferous paralic molasse incorporated during a later tectonic event. During a survey of the still-active quarry in 2010, volcaniclastic horizons were identified and sampled. Direct correspondence of the tuff units to those sampled in 1987 cannot be proved but is likely. High precision chemical abrasion – thermal ionization mass spectrometry (CA-TIMS) U-Pb dating of zircon from this new material has yielded an age of 340.05 ± 0.22 Ma, which correlates to the previously inferred stratigraphic age of the locality and the current calibration of the Early Carboniferous geologic time scale. The newly established age corresponds to the Visean stage and dates the boundary between the Horní Benešov and Moravice Formations that can be correlated with other foredeep basins of the Culm in the European Variscides. A population of detrital Cambro-Ordovician zircons and a single 2.0 Ga old zircon crystal from the same volcaniclastic layer dated by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) are consistent with the known age of source material in the Variscan orogenic front.
Trvalý link: http://hdl.handle.net/11104/0245906