Record details

Title
    The Brno Massif: a section through the active continental margin or a composed terrane?
Statement of responsibility
    Pavel Hanžl, Rostislav Melichar
Other titles
    Brněnský masiv: profil aktivním kontinentálním okrajem nebo složený terán?
Author
    Hanžl, Pavel
    Melichar, Rostislav
Language
    anglicky
Source title - serial
    Krystalinikum
Vol./nr.
    Vol. 23
Pages
    p. 33-58
Year
    1997
Notes
    14 obr., 2 fot., 5 tab., 4 s.bibl.
    České resumé
    Zkr. název ser.: Krystalinikum
Subject group
    brněnský masiv
    chemismus hornin
    geologie strukturní
    granitoidy
    kontinentální okraj
    metabazit
    petrogeneze
    terán
    vrásnění variské
    vzácné zeminy
Geographical name
    Blansko (Blansko)
    ČR-Morava
    Dolní Kounice (Brno-venkov)
    Kuřim (Brno-venkov)
    Lažany (Blansko)
    Lelekovice (Brno-venkov)
    Lipůvka (Blansko)
    Moravské Knínice (Brno-venkov)
    Želešice (Brno-venkov)
Keyword
    Active
    Brno
    Composed
    Continental
    Margin
    Massif
    Section
    Terrane
    Through
Abstract (in english)
   The Brno Massif is a body composed of the Cadomian East and West granodiorite areas which are tectonically separated by the Metabasite Zone of an unknown age. Both the granodiorite areas are formed by calc-alkaline metaluminous rocks they slightly differ in their composition. The East area is composed of granodiorites and tonalites representing plutonic rocks of a primitive volcanic arc. The West area is formed by granites, granodiorites and tonalites representing more evolved rocks of a volcanic arc or of an active continental margin. Many relics of wall rocks are preserved here. Metasediments prevail in the NW-SE oriented narrow belts further to the west. Calc-alkaline mafic and ultramafic rocks form the relatively independent N-S oriented diorite belt along the eastern margin of the area. The Metabasite Zone consists of a bimodal volcanic association metamorphosed in the greenschist facies conditions. The pre-vailing basalts have composition similar to that of the MORB.
   Both the granodiorite areas were brought together along the Metabasite Zone during the older east vergent thrusting that was strongly reworked by sinistral strike slips later. The age of these events is supposed to be Variscan because of the incorporation of the Lower Devonian clastics and the Givetian limestones of the Babí lom Zone into structure of the Metabasite Zone
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    20. 2. 2008
Import date
    8. 8. 2012