Record details

    Coronitic metagabbros of the Mariánské Lázně Complex and Teplá Crystalline Unit: inferences for the tectonometamorphic evolution of the western margin of the Teplá-Barrandian Unit, Bohemian Massif
Statement of responsibility
    Veronika Štědrá, Václav Kachlík, Ryszard Kryza
Other titles
    Palaeozoic Amalgamation of Central Europe (Variant.)
    Kachlík, Václav
    Kryza, Ryszard
    Štědrá, Veronika
Source title - serial
    Geological society special publication
    Vol. 201
    p. 217-236
    6 obr., 2 fot., 3 tab., 3 s. bibl.
    Zkr. název ser.: Geol. Soc. spec. Publ. (London).
Subject group
    chemismus hornin
    chemismus minerálů
    mariánskolázeňský bazický komplex
    obruba kelyfitická
    tepelské krystalinikum
    vrásnění kadomské
Geographical name
    Mariánské Lázně (Cheb)
    Teplá (Karlovy Vary)
Abstract (in english)
   Bodies of coronitic metagabbro occur in the SW Mariánské Lázně Complex (MLC) and the adjacent Teplá Crystalline Unit (TCU) on the western margin of the Teplá-Barrandian Unit (TBU), Bohemian Massif. The characteristic structural, geochemical, petrographic, and metamorphic features of five groups of metagabbros and related rocks are presented, compared with other metabasites of the MLC and Zone of Erbendorff-Vohenstrauss (ZEV), and used to constrain the tectonometamorphic evolution of the western part of the TBU. The metagabbros are considered to be a younger intrusive member of the complicated lower crustal tectonic stack of Upper Proterozoic to Early Palaeozoic age which is formed by the Mariánské Lázně Complex and the Teplá Crystalline Unit together. It is proposed that a significant part of the metamorphic evolution of some parts of these units took place before the emplacement of metagabbros and granitoids at around 496-516 Ma.
   The sequence of metamorphic events is interpreted to have been as follows. Deep burial of primitive MORE type tholeiitic rocks (a) metamorphosed up to eclogite facies, followed by (b) uplift to lower crustal levels so that the partially exhumed rocks were juxtaposed with other lower/middle crustal rocks. Thermal relaxation (c) followed, with an episode of extension recorded in L-tectonites of amphibolite facies. Once this lithologically variegated stack was welded together, it was intruded by the Upper Cambrian-Lower Ordovician granitoids and gabbros (d). This pre-Variscan metamorphic event may be expressed at the supracrustal level by an unconformity between Upper Cambrian and Lower Ordovician rocks in the Barrandian. The final configuration of the units was established during the Variscan collision of the Teplá Barrandian terrane with Saxothuringia (e) in which the rocks of the MLC and TCU were thrust to the NW over the Saxothuringian para-autochthon.
   The accompanying metamorphic event reached upper amphibolite facies. The thermally relaxed rocks cooled rapidly, and pre-existing thrust planes were re-activated during the final extensional collapse
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    24. 10. 2007
Import date
    8. 8. 2012