Record details

    40Ar/39Ar hornblende dating of a microgranodiorite dyke: implications for early Permian extension in the Moldanubian Zone of the Bohemian Massif
Statement of responsibility
    Jan Košler, S.P. Kelley, Stanislav Vrána
    Kelley, S. P.
    Košler, Jan, 1965-
    Vrána, Stanislav
Source title - serial
    International journal of Earth sciences (Geologische Rundschau)
    Vol. 90, no. 2
    p. 379-385
    2 obr., 1 fot., 2 tab., 25 bibl.
    Zkr. název ser.: Int. J. Earth Sci. (Geol. Rdsch.)
Subject group
    blanická brázda
    datování Ar/Ar
    moldanubikum jižních a jihovýchodních Čech
    tektonika extenzní
    vrásnění variské
Geographical name
    Veselí nad Lužnicí (Tábor)
Abstract (in english)
   Laser fusion 40Ar/39Ar ages of titanian pargasite from a microgranodiorite dyke swarm in the southern Bohemian Massif effectively date the early Permian (late Autunian) emplacement of dykes into a cool Moldanubian crust. This intrusion represents the youngest magmatic phase recorded in this part of the Moldanubian Zone. Strontium and neodymium isotopic ratios of microgranodiorites point to magma derivation from re-melting the lower crustal rocks with a possible component of upper mantle composition. Spatial and temporal association of the dykes with movements on a major N-S (NNE-SSW) tectonic discontinuity (Blanice-Kaplice-Rödl fault zone) suggests that their emplacement corresponds to the maximum age of fault movements associated with the E/W-oriented extension in this part of the Bohemian Massif
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    7. 4. 2008
Import date
    8. 8. 2012