caa a22 4500 477063861 CHVBK 20180405111407.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00192073 doi (NATIONALLICENCE)springer-10.1007/BF00192073 Zircon dating of North Bohemian granulites, Czech Republic: further evidence for the Lower Carboniferous high-pressure event in the Bohemian Massif [Elektronische Daten] [J. Kotková, A. Kröner, W. Todt, J. Fiala] U-Pb zircon and rutile multigrain ages and 207Pb/206Pb zircon evaporation ages are reported from high-pressure felsic and metapelitic granulites from northern Bohemia, Czech Republic. The granulites, in contrast to those from other occurrences in the Bohemian Massif, do not show evidence of successive HT/MPLP overprints. Multigrain size fractions of nearly spherical, multifaceted, metamorphic zircons from three samples are slightly discordant and yield a U-Pb Concordia intercept age of 348 ± 10 Ma, whereas single zircon evaporation of two samples resulted in 207Pb/206Pb ages of 339 ± 1.5 and 339 ± 1.4 Ma, respectively. A rutile fraction from one sample has a U-Pb Concordia intercept age of 346 ± 14 Ma. All ages are identical, within error, and a mean age of 342 ± 5 Ma was adopted to reflect the peak of HP metamorphism. Because rutile has a lower closing temperature for the U-Pb isotopic system than zircon, the results and the P-T data imply rapid uplift and cooling after peak metamorphism. The above age is identical to ages for high-grade metamorphism reported from the southern Bohemian Massif and the Granulite Massif in Saxony. It can be speculated that all these granulites were part of the same lower crustal unit in early Carboniferous, being separated later due to crustal stacking and subsequent late Variscan orogenic collapse. Springer-Verlag, 1996 HP granulites nationallicence Zircon dating nationallicence Rutile dating nationallicence Lower Carboniferous nationallicence N Bohemia Czech Republic nationallicence Kotková J. Czech Geological Survey, Klárov 3, CS-118 21, Prague 1, Czech Republic aut Kröner A. Institut für Geowissenschaften, Universität Mainz, D-55099, Mainz, Germany aut Todt W. Max-Planck Institut für Chemie, Postfach 3060, D-55060, Mainz, Germany aut Fiala J. Geological Institute ASCR, Rozvojová 135, CS-165 00, Prague 6, Czech Republic aut Geologische Rundschau Springer-Verlag 85/1(1996-03-01), 154-161 0016-7835 85:1<154 1996 85 531 https://doi.org/10.1007/BF00192073 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00192073 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kotková J. Czech Geological Survey, Klárov 3, CS-118 21, Prague 1, Czech Republic aut NATIONALLICENCE 700 1- Kröner A. Institut für Geowissenschaften, Universität Mainz, D-55099, Mainz, Germany aut NATIONALLICENCE 700 1- Todt W. Max-Planck Institut für Chemie, Postfach 3060, D-55060, Mainz, Germany aut NATIONALLICENCE 700 1- Fiala J. Geological Institute ASCR, Rozvojová 135, CS-165 00, Prague 6, Czech Republic aut NATIONALLICENCE 773 0- Geologische Rundschau Springer-Verlag 85/1(1996-03-01), 154-161 0016-7835 85:1<154 1996 85 531 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer