Record details

Title
    Ryolity v metadioritové zóně brněnského masivu
Other titles
    Rhyolites from Metadiorite Zone of the Brno Massif
Author
    Buriánek, David
    Gilíková, Helena
Language
    česky
Publication type
    článek v periodiku
Source title - serial
    Geologické výzkumy na Moravě a ve Slezsku
Vol./nr.
    Roč. 18, č. 2
Pages
    7
Year
    2011
Thesaurus term
    rhyolite, alteration, Metadiorite Zone, Brno Massif
Keyword
    Brněnského
    Masivu
    Metadioritové
    Ryolity
    Zóně
Abstract (in czech)
   The rhyolite dykes up to 4 m thick crosscuts basic and ultrabasic plutonic rocks in the Metadiorite Zone of the Brno Massif. Two distinct rhyolite types have been recognized. The first unaltered type occurs mainly in the southern part of the Metadiorite Zone. They are fine-grained porphyritic rhyolites, locally with spherules and skeletal crystals of K-feldspar. However majority of dykes are porphyritic to aphanitic fine-grained rocks, which are strongly affected by hydrothermal alteration (albitization, sericitization, turmalinization, chloritization). Unaltered rhyolites in the Metadiorite Zone have very similar geochemical signatures (e. g. content REE or HFSE) as vulcanoclastic stratas in the Devonian sedimentary cover of the Brno Massif.
Abstract (in english)
   Rhyolites from Metadiorite Zone of the Brno Massif
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014