Record details

Title
    Late Variscan strike-slip tectonics between the Teplá-Barrandien and Moldanubian terranes (Czech Bohemian Massif): petrostructural evidence
Statement of responsibility
    Pavel Pitra, Jean-Pierre Burg, Michel Guiraud
Author
    Burg, Jean-Pierre
    Guiraud, Michel
    Pitra, Pavel
Language
    anglicky
Source title - serial
    Journal of the Geological society
Vol./nr.
    Vol. 156, no. 5
Pages
    p. 1003-1020
Year
    1999
Notes
    10 obr., 1 pl., 1 tab., 4 s.bibl.
    Zkr. název ser.: J. Geol. Soc. (Bath)
Subject group
    analýza petrotektonická
    bohemikum
    chemismus minerálů
    geologie strukturní
    granitoidy
    metamorfóza
    metasedimenty
    migmatit
    moldanubikum
    podmínky P-T
    posun horizontální
    vrásnění variské
    zóna střižná
Geographical name
    ČR-Čechy
Keyword
    Bohemian
    Czech
    Evidence
    Late
    Massif
    Moldanubian
    Petrostructural
    Strike-slip
    Tectonics
    Teplá-Barrandien
    Terranes
    Variscan
Abstract (in english)
   In the Variscan Bohemian Massif (Czech Republic), no agreement has benn reached on the nature of the relationship between the Teplá-Barrandian and the Moldanubian terranes. However, the Teplá-Barrandian is interpreted as a central segment separating the Moldanubian and Saxothuringian terranes and its position is therefore essential for any reconstruction of this part of the Variscan belt. Our petrological and structural study in the Domažlice-Klatovy region spans the boundary between the Teplá-Barrandian and Moldanubian terranes. There is no conformity of ductile structures in both domains near their interface P-T evolution is separate in time. The development of major structures and associated metamorphism in the southwestern part of the Barrandian was accompanied by syntectonic intrusions of granitoid and diorite bodies, dated at about 520 Ma. The Moldanubian migmatites are characterized by a LP-HT metamorphism that possibly took place at about 320 Ma.
   The metamorphic record of the Barrandian rocks shows no influence of the Moldanubian partial melting. The contacts are marked by semi-brittle to brittle structures: sinistral strike-slip faulting developed in the Central Bohemian Shear Zone, whereas the West Bohemian Shear Zone acted as a semi-brittle normal fault with a dextral component. Both shear zones may be nearly contemporaneous, accommodating a bulk N-S compression. The Central Bohemian Shear Zone was later reactivated in a dextral regime. Although timing is uncertain, the juxtaposition of both terranes took place probably in the waning stages of the Variscan orogeny, earlier than the late Stephanian. We argue that the late-orogenic (semi) brittle strike-slip tectonics modified considerably the face of the Bohemian Massif and the geodynamic models of the Bohemian Massif have to be reviewed with reference to this essential point
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    14. 2. 2008
Import date
    8. 8. 2012