ISSN:
0016-7835
Keywords:
Key words HP granulites
;
Zircon dating
;
Rutile dating
;
Lower Carboniferous
;
N Bohemia
;
Czech Republic
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
Abstract 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/MP-LP 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00192073
Permalink
