Record details

Title
    Assemblages and chemical composition of amphiboles in rocks of the Jílové Belt, Central Bohemia
Statement of responsibility
    Eva Fediuková, Ferry Fediuk
Other titles
    Asociace a chemické složení amfibolů hornin Jílovského pásma, střední Čechy
Author
    Fediuk, František, 1929-
    Fediuková, Eva
Language
    anglicky
Source title - serial
    Journal of the Czech Geological Society
Vol./nr.
    Vol. 45, no. 1-2
Pages
    s. 119-130
Year
    2000
Notes
    7 obr., 1 pl., 5 tab.
    České resumé
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: J. Czech geol. Soc.
Subject group
    amfiboly
    jílovské pásmo
    metaandezit
    metabazalt
    metamorfóza
    mikrosonda elektronová
    ortorula
    proterozoikum
    složení
    vrásnění variské
Geographical name
    ČR-Čechy
Keyword
    Amphiboles
    Assemblages
    Belt
    Bohemia
    Central
    Chemical
    Composition
    Jílové
    Rocks
Abstract (in english)
   Amphiboles constitute, along with feldspars and quartz, the most widespread minerals of the Proterozoic metavolcanic Jílové Belt. They occur in major amount in its metabasaltic and metaandesitic rocks, but they are locally also present as a characteristic subordinate constituent in acid mebers of the belt, namely in orthogneisses. Many species of amphiboles can be distinguished here: dominant magnesiohornblende, abundant actinolite and less common tschermakite, ferrotschermakite, ferrohornblende, ferroactinolite, pargasite, ferropargasite and edenite. Cummingtonite is widespread. In contrast, typical alkali amphiboles and NaCa amphiboles are absent. In most samples, two up to four of the above mentioned species usually occur. The present assemblages resulted from an interaction of the bulk rock chemistry with pre-Palaeozoic regional and Variscan contact metamorphism. Relictic amphiboles of the magmatic stage, represented by high-alumina members, are present in subordinate amount only
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    11. 6. 2007
Import date
    8. 8. 2012