Record details

Title
    Complex metamorphic zonation of the Thaya dome: result of buckling and gravitational collapse of an imbricated nappe sequence
Statement of responsibility
    Pavla Štípská, Karel Schulmann, Volker Höck
Other titles
    Forces Folds and Fractures (Variant.)
Author
    Höck, Volker
    Schulmann, Karel
    Štípská, Pavla
Language
    anglicky
Source title - serial
    Geological society special publication
Vol./nr.
    Vol. 169
Pages
    p. 197-211
Year
    2000
Notes
    11 obr., 1 fot., 3 tab., 2 s.bibl.
    il.
    Zkr. název ser.: Geol. Soc. spec. Publ. (London).
Subject group
    denudace
    geometrie
    metamorfní pásmo
    metamorfóza
    metapelity
    moldanubikum západní Moravy
    moravikum
    okno tektonické
    ortorula
    podmínky P-T
    příkrov
    rulový dóm
    tektonika šupinová
    tlak střižný
    viskozita
    vrása
    vrásnění variské
Geographical name
    ČR-Morava
    Rakousko-Niederösterreich
    Znojmo
Keyword
    Buckling
    Collapse
    Complex
    Dome
    Gravitational
    Imbricated
    Metamorphic
    Nappe
    Result
    Sequence
    Thaya
    Zonation
Abstract (in english)
   The metamorphic isograd geometry and dome structure of the Thaya tectonic window, which emerges through the Moldanubian nappe pile at the eastern margin of the Bohemian Massif is interpreted as a result of large-scale buckling of an imbricated nappe sequence. This large scale mechanical instability was intiated by the blocking of passively transported hot viscous rocks to shallow crustal levels. The wavelength and shape of the buckle fold is controlled by the greatest thickness of the uppermost nappe and by the low ratio of strong orthogneiss to weak micaschists in individual nappes. The steep inclinations of thrust surfaces and the oblique movement of the crustal multilayer minimizes the role of gravity on fold generation. Medium-scale gravitational folds originated at the end of the buckling of the nappes and are associated with the late sliding of the nappes away from the core of the anticline during late exhumation.
   Thermal, rheological and fold calculations are presented which document and explain the mechanism of folding of large-scale crystalline nappes
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    20. 8. 2007
Import date
    8. 8. 2012