Podrobnosti záznamu

    Mesostructural and kinematic characteristics of core gneisses in western part of the Orlica-Snieznik Dome, West Sudetes
Údaj o odpovědnosti
    Marian Dumicz
    Dumicz, Marian
Zdrojový dokument - seriál
    Geologia sudetica
    Vol. 31, no. 1
    p. 105-111
    4 obr., 4 fot., 10 bibl.
    Zkr. název ser.: Geol. sudetica.
Předmětová skupina
    geologie strukturní
    orlicko-sněžnické krystalinikum
    rulový dóm
    tektonika polyfázová
    vrásnění variské
    zóna zlomová
Geografické jméno
    Klášterec nad Orlicí (Ústí nad Orlicí)
    Polsko - jihozápad
Klíčové slovo
Abstrakt (anglicky)
   The Orlica-Snieznik Dome in the West Sudetes consists of an orthogneissic core and a schist-phyllite mantle. It is subdivided into two parts tectonically separated by the Upper Cretaceous Nysa Graben. In this paper structures developed during polyphase deformation of the c.500 Ma core gneisses in the westerm part (Orlické hory, Góry Orlickie, Góry Bystrzyckie) are compared with those of the eastern part (Snieznik massif). The effects of deformations D1 to D4 structures are, in general mutually comparable in the gneissic series of the Góry Orlickie (Mountains) and the Snieznik complex. D5 structures, manifested in the Góry Orlickie as S-C structures which show a top-to-the-south or top-to-the-southwest sense of displacement, are, however, not know in this shape from the eastern part. Structures of such geometry in the gneisses of the later region were ascribed to deformation D3.
   The C element of the S-C structures is represented in the Góry Orlickie by a rough S5 domainal cleavage, spatially related to the NW-SE fault zone of Olešnice-Uhřínov, which separated the gneissic core from the Nové Město series and the Zábřeh series of the mantle. This relationship suggests that both the S5 cleavage and the fault zone associated with the same deformation event D5 and originated under similar rheological and kinematic conditions. In both cases cataclastic deformation was accompanied by only local and limited recrystallization of white micas. Kinematic analysis of the D5 tectonic structures shows that these structures were formed in a sinistral transtension regime. In the Góry Bystrzyckie the tabular crystals of microcline, usually preserving their original shapes, are, in general, arraged along the S3 gneissosity planes in which they show a considerable scatter.
   They are more or less lenticularly deformed, in concordance with the SSW-trending L3 mineral recrystallization lineation, and point to a top-to-the-north sense of shearing during D3 event
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
Datum vložení
    18. 2. 2008
Datum importu
    8. 8. 2012