Record details

Title
    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
Author
    Kelley, S. P.
    Košler, Jan, 1965-
    Vrána, Stanislav
Language
    anglicky
Source title - serial
    International journal of Earth sciences (Geologische Rundschau)
Vol./nr.
    Vol. 90, no. 2
Pages
    p. 379-385
Year
    2001
Notes
    2 obr., 1 fot., 2 tab., 25 bibl.
    il.
    Zkr. název ser.: Int. J. Earth Sci. (Geol. Rdsch.)
Subject group
    amfiboly
    blanická brázda
    dajka
    datování Ar/Ar
    granitoidy
    moldanubikum jižních a jihovýchodních Čech
    ochlazování
    perm-spodní
    petrogeneze
    tektonika extenzní
    vrásnění variské
Geographical name
    ČR-Čechy
    Veselí nad Lužnicí (Tábor)
Keyword
    40Ar/39Ar
    Bohemian
    Dating
    Dyke
    Early
    Extension
    Hornblende
    Implications
    Massif
    Microgranodiorite
    Moldanubian
    Permian
    Zone
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
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    7. 4. 2008
Import date
    8. 8. 2012