Zircon (re)crystallization during short-lived, high-P granulite facies metamorphism (Eger Complex, NW Bohemian Massif)

Zircon (re)crystallization during short-lived, high-P granulite facies metamorphism (Eger Complex, NW Bohemian Massif)

The Eger Complex in the northwestern Bohemian Massif consists mainly of amphibolite facies granitic gneisses containing a subordinate volume of felsic granulites. Microstructural changes and modelling of metamorphic conditions for both rock types suggest a short‐lived static heating from ~760 to ~85...

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Bibliographic Details
Published in:Journal of metamorphic geology Vol. 32; no. 8; pp. 885 - 902
Main Authors: Konopasek, J, Pilatova, E, Kosler, J, Slama, J
Format: Journal Article
Language:English
Published: Oxford Blackwell Publishing Ltd 01-10-2014
Subjects:
Bohemian Massif
Crystallization
geochronology
Geology
granulite
Metamorphism
Mineralogy
zircon recrystallization
zirconium saturation modelling
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Summary:The Eger Complex in the northwestern Bohemian Massif consists mainly of amphibolite facies granitic gneisses containing a subordinate volume of felsic granulites. Microstructural changes and modelling of metamorphic conditions for both rock types suggest a short‐lived static heating from ~760 to ~850 °C at a constant pressure of ~16 kbar, which led to the partial granulitization of the granitoid rocks. Detailed study of the protolith zircon modifications and modelling of the Zr re‐distribution during the transition from amphibolite to granulite facies suggests that the development of c. 340 Ma old zircon rims in the granulite facies sample is the result of recrystallization of older (c. 475 Ma) protolith zircon. This study suggests that the partial granulitization is a result of a short exposure of the Eger Complex metagranitoids to a temperature of ~850 °C at the base of an arc/fore‐arc domain and their subsequent rapid exhumation during the Lower Carboniferous collision along the western margin of the Bohemian Massif.
Bibliography:ark:/67375/WNG-3GV9X07J-D
ArticleID:JMG12098
istex:B23495D395F82D4415DCD972AE729E52006A1167
Czech Science Foundation - No. P210/11/2358
Table S1. U, Th and Ti contents and Th/U ratios in zircon from samples B3 and K45-B.Table S2. Isotopic data for zircon in sample B3.Table S3. Isotopic data for zircon in sample K45-B.
ISSN:0263-4929
1525-1314
DOI:10.1111/jmg.12098