Record details

Title
    Geochemistry of the Late Devonian intermediate to acid metavolcanic rocks from the southern part of the Vrbno Group, the Jeseníky Mts. (Moravo-Silesian Belt, Bohemian Massif, Czech Republic): paleotectonic implications
Statement of responsibility
    František Patočka, Jiří Valenta
Author
    Patočka, František
    Valenta, Jiří
Language
    anglicky
Source title - serial
    Geolines
Vol./nr.
    Vol. 4
Pages
    p. 42-54
Year
    1996
Notes
    8 obr., 1 tab., 4 s.bibl.
Subject group
    chemismus hornin
    devon-svrchní
    metamorfika
    moravskoslezský devon a spodní karbon
    paleotektonika
    petrogeneze
    ryolit
    trachyt
    vrásnění variské
    vulkanismus
    vzácné zeminy
Geographical name
    ČR-Morava
    Horní Město (Bruntál)
Keyword
    Acid
    Belt
    Bohemian
    Czech
    Devonian
    Geochemistry
    Group
    Implications
    Intermediate
    Jeseníky
    Late
    Massif
    Metavolcanic
    Moravo-Silesian
    Mts
    Paleotectonic
    Republic
    Rocks
    Southern
    Vrbno
Abstract (in english)
   The alkaline intermediate to acid metavolcanic rocks of the southern part of the Vrbno Group (the Jeseníky Mts., Moravo-Silesian Belt) are interpreted as a within-plate trachyte-rhyolite suite metamorphosed to lower greenschist facies. Primary volcanics of the Late Devonian age were probably generated by the differentiation of basic melts geochemically comparable with tholeiitic to mildly alkaline within-plate basalts. The geochemical characteristics of the rocks studied are considered to indicate litosphere extension and thinning of the Devonian structure transformed to the Moravo-Silesian Belt by the Variscan orogeny. Nevertheless, the subduction-related chemical features shown by some Devonian rocks of the Jeseníky Mts. presumably indicate an arc and back-arc (the latter initiated like an intracontinental rift) tectonic setting as the most probable for the emplacement of the primary volcanics
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    17. 8. 2007
Import date
    8. 8. 2012