Record details

    Syn-convergent high-temperature metamorphism in the Variscides: a discussion of potential heat sources
Statement of responsibility
    A. Henk, F. von Blankenburg, Friedrich Finger, Urs Schaltegger, Gernold Zulauf
Other titles
    Orogenic Processes: Quantification and Modelling in the Variscan Belt (Variant.)
    Blankenburg, F., von
    Finger, Friedrich
    Henk, A.
    Schaltegger, Urs
    Zulauf, Gernold
Source title - serial
    Geological society special publication
    Vol. 179
    p. 387-399
    2 obr., 4 s.bibl.
    Zkr. název ser.: Geol. Soc. spec. Publ. (London).
Subject group
    Český masiv
    metamorfóza vysokostupňová
    plášťový chochol
    tepelný tok
    vrásnění variské
    zóna subdukční
Geographical name
    Česká republika
    Evropa střední
Abstract (in english)
   A period of pervasive high-temperature metamorphism and igneous activity from 340 to 325 Ma is a well-established characteristic of the Variscan Orogen of Central Europe. During this stage, the internal zone of the orogen was virtually soaked by granitic to granodioritic magmas. Petrological data point to temperatures of 600-850 °C at upper- to mid-crustal levels. These elevated temperatures occurred during the final convergence stage and may be comparable with similar processes inferred from geophysical evidence for the present-day Tibetian Plateau, in both regional extent and significance for the orogen's evolution. We review various geodynamic scenarios that may have provided the heat for melting and metamorphism, and compare model predictions with field data from the Variscides. All lines of evidence point to a geodynamic scenario that led to thickening of the continental crust with increased internal radiogenic heating, but without simultaneous thickening of the mantle lithosphere
   Possible mechanisms include convective removal of the thermal boundary layer, delamination of part of the lithospheric mantle, and subduction of the mantle lithosphere of the downgoing plate. However, with the present stage of knowledge it is virtually impossible to single out one of these three mechanisms, as their geological consequences are so similar
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    3. 5. 2007
Import date
    8. 8. 2012