Record details

    Evidence for high temperature diffusional creep preserved by rapid cooling of lower crust (North Bohemian shear zone, Czech Republic)
Statement of responsibility
    Gernold Zulauf, Wolfgang Dörr, Jiří Fiala, Jana Kotková, Henri Maluski, P. Valverde-Vaquero
    Dörr, Wolfgang
    Fiala, Jiří, 1937 led.10.-
    Kotková, Jana, 1963-
    Maluski, Henri
    Valverde-Vaquero, P.
    Zulauf, Gernold
Source title - serial
    Terra nova
    Vol. 14, no. 5
    p. 343-354
    9 obr., 1 fot.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Terra nova
Classfication no.
Conspectus category
Subject group
    datování Ar/Ar
    geologie regionální
    krušnohorské krystalinikum
    kůra spodní
    tektonika bloková
    tepelské krystalinikum
    zóna střižná
Geographical name
Abstract (in english)
   Volume diffusion and dislocation creep at T & 800 °C led to high finite strain in granulite and orthogneiss of the Ohre crystalline complex (North Bohemian shear zone). Intragranular creep by volume diffusion is indicated by (i) lobate phase boundaries between feldspar and quartz, and (ii) removal of perthite lamellae and precipitation of tiny, aluminium-rich needles at the margins of K-feldspar. The striking diffusional-creep structures imply high interfacial free energy that has been preserved from equilibration as a result of rapid cooling. U-Pb dating of monazite (342+-1 Ma) and 40Ar-39Ar dating of muscovite (341+-4 Ma) of Kadari orthogneiss result in a cooling rate of 50 + 25/-17 °C Myr -1. This high value is attributed to collapse-related 'elevator-style' movements along the North Bohemian shear zone, resulting in the juxtaposition of upper crustal rocks of the Tepla-Barrandian unit against lower crustal rocks of the Erzgebirge crystalline complex
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    25. 3. 2008
Import date
    8. 8. 2012