Record details

Title
    Ordovician metagranites and migmatites of the Svratka and Orlice?Sněžník units, northeastern Bohemian Massif
Author
    Buriánek, David
    Hanžl, Pavel
    Krumlová, Hana
    Verner, Kryštof
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Journal of Geosciences
Vol./nr.
    Roč. 54, č. 2
Pages
    20
Year
    2009
Thesaurus term
    Bohemian Massif, Cambro?Ordovician rifting, geochemistry, metagranite, migmatite, microstructures, Variscan orogeny
Keyword
    Bohemian
    Massif
    Metagranites
    Migmatites
    Northeastern
    Ordovician
    Orlice?Sněžník
    Svratka
    Units
Abstract (in english)
   Metagranites and migmatites of the Svratka and the Orlice?Sněžník units, northeastern Bohemian Massif, exhibit a number of similarities in their lithological, mineralogical and geochemical features. Both of these units were affected by intense migmatitization accompanied by intrusion of peraluminous granites during the Cambrian to Ordovician. The chemical composition and mineralogy of all the studied rocks correspond to crustal melts. From the geochemical point of view, both rock groups (migmatites and metagranites) exhibit progressive geochemical fractionation (increase in the SiO2, Rb, XFeO, W and Sn contents, accompanied by a decrease in the concentrations of Ba, Sr, Mg and Ca) as a result of varying degrees of partial melting and fractional crystallization. The main rock-forming minerals are influenced by metamorphic recrystallization under amphibolite-facies conditions during the Variscan orogeny.
Contributor
    UK Praha, Přírodovědecká fakulta
Contributor code
    UK, PřF
Source format
    R
Import date
    8. 8. 2012