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    Pre-Variscan geological events in the Austrian part of the Bohemian Massif deduced from U-Pb zircon ages

    Access Status
    Fulltext not available
    Authors
    Friedl, G.
    Finger, F.
    Paquette, J.
    von Quadt, A.
    McNaughton, Neal
    Fletcher, Ian
    Date
    2004
    Type
    Journal Article
    
    Metadata
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    Citation
    Friedl, Gertrude and Finger, Fritz and Paquette, Jean-Louis and von Quadt, Albrecht and McNaughton, Neal and Fletcher, Ian. 2004. Pre-Variscan geological events in the Austrian part of the Bohemian Massif deduced from U-Pb zircon ages. International Journal of Earth Sciences. 93: pp. 802-823.
    Source Title
    International Journal of Earth Sciences
    DOI
    10.1007/s00531-004-0420-9
    ISSN
    14373254
    Faculty
    John De Laeter Centre For Mass Spectrometry (JdL
    Faculty of Science and Engineering
    School
    John de Laeter Centre for Mass Spectrometry (COE)
    Remarks

    The original publication is available at : www.springerlink.com

    URI
    http://hdl.handle.net/20.500.11937/36577
    Collection
    • Curtin Research Publications
    Abstract

    In an attempt to elucidate the pre-Variscan evolution history of the various geological units in the Austrian part of the Bohemian Massif, we have analysed zircons from 12 rocks (mainly orthogneisses) by means of SHRIMP, conventional multi-grain and single-grain U-Pb isotope-dilution/mass-spectrometry. Two of the orthogneisses studied represent Cadomian metagranitoids that formed at ca. 610 Ma (Spitz gneiss) and ca. 580 Ma(Bittesch gneiss). A metagranite from the Thaya batholith also gave a Cadomian zircon age (567-5 Ma). Traces of Neoproterozoic zircon growth were also identified in several other samples, underlining the great importance ofthe Cadomian orogeny for the evolution of crust in the southern Bohemian Massif. However, important magmatic events also occurred in the Early Palaeozoic. A sample of the Gfhl gneiss was recognised as a488-6 Ma-old granite. A tonalite gneiss from the realm of the South Bohemian batholith was dated at 456-3 Ma, and zircon cores in a Moldanubian metagranitic granulite gave similar ages of 440-450 Ma. This Ordovician phase of magmatism in the Moldanubian unit is tentatively interpreted as related to the rifting and drift of South Armorica from the African Gondwana margin. The oldest inherited zircons, in a migmatite from the South Bohemian batholith, yielded an age of ca. 2.6 Ga, and many zircon cores in both Moravian and Moldanubian metagranitoid rocks gave ages around 2.0 Ga. However, rocks from the Moldanubian unit show a striking lack of zircon ages between 1.8 and 1.0 Ga, reflecting an ancestry from Armorica and the North African part of Gondwana, respectively, whereas the Moravian Bittesch gneiss contains many inherited zircons with Mesoproterozoic and Early Palaeoproterozoic ages of ca. 1.2, 1.5 and 1.65?1.8 Ga, indicating a derivation from the South American part of Gondwana

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