Record details

    10 km minimum throw along the West Bohemian shear zone : evidence for dramatic crustal thickening and high topography in the Bohemian Massif (European Variscides)
Statement of responsibility
    Gernold Zulauf, Curd Bues, Wolfgang Dörr, Zdeněk Vejnar
    Bues, Curd
    Dörr, Wolfgang
    Vejnar, Zdeněk, 1923-
    Zulauf, Gernold
Source title - serial
    International journal of Earth sciences (Geologische Rundschau)
    Vol. 91, no. 5
    p. 850-864
    4 obr., 1 fot., 4 tab.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Int. J. Earth Sci. (Geol. Rdsch.)
Classfication no.
Conspectus category
Subject group
    Český masiv
    datování Ar/Ar
    geologie regionální
    podmínky P-T
    tektonika bloková
    vrásnění variské
    zóna střižná
Geographical name
Abstract (in english)
   The West Bohemian shear zone (WBSZ) forms a steep collapse structure along which east-side-down normal movements led to the juxtaposition of the relatively cold Cadomian basement of the Tepla-Barrandian unit against high grade Moldanubian rocks. Synkinematic plutons straddle the WBSZ. The Mutěnín pluton intruded into Moldanubian crust at a depth of 23_4 km as derived by using Al-in-hornblende barometry. The Tepla-Barrandian Babylon pluton intruded at <12 km depth as indicated by phengite barometry and petrogenetic considerations. Both emplacement depths, together with mineral cooling ages, result in a minimnm vertical displacement of 10 km between 340 and 320 Ma. This large throw could be explained by overthickened crust that was weakened from below. The alkaline signature of the Mutenin diorite indicates that mantle melting was important to thermally weaken the crust at 340 Ma.
   The cold Tepla-Barrandian upper crust sank into its weak, partly molten Moldanubian substratum, resulting in elevator-style movements, not only along the WBSZ, but also along the Hoher Bogen and Central Bohemian shear zone. All these ductile normal shear zones were active simultaneously during the Lower Carboniferous and dip steeply towards the Tepla-Barrandian unit that probably formed a highly elevated plateau at this time
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    7. 4. 2008
Import date
    8. 8. 2012