Record details

    Chemical changes in Moldanubian amphibolites caused by regional metamorphism
Statement of responsibility
    Dušan Němec
    Němec, Dušan, 1927-2001
Other author; role
   Suk, Miloš
Source title - serial
    Vol. 25
    p. 105-125
    16 obr., 4 tab., 3 s.bibl.
    České resumé
    Zkr. název ser.: Krystalinikum
Subject group
    chemismus hornin
    metamorfóza regionální
    migrace prvků
    vrásnění variské
Geographical name
Abstract (in english)
   The regionally metamorphosed Moldanubian rocks of the Bohemian-Moravian Plateau (Českomoravská vrchovina) represent a polymetamorphic complex was mostly metamorphosed to the highest grades of the amphibolite facies. It largely consists of various types of gneisses which often contain bodies of orthoamphibolites. Conspicuous chemical changes occurred in them during regional metamorphism. It can be shown that these changes were not caused by spilitization or by another type of premetamorphic alteration. The chemical changes were studied by two approaches. The chemical composition of relict gabbros, which are exceptionally preserved in a few amphibolite complexes, was compared with the composition of concentrations of elements contained in the amphibolites, which are known to be mobile and immobile, respectively, during regional metamorphism. Regional metamorphism caused an increase in abundance of LILE, particularly of K, Rb, Ba and Th.
   Apparently, this input of LILE came from gneisses which envelope the amphibolite bodies during their Variscan migmatization
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    28. 3. 2008
Import date
    8. 8. 2012