Record details

Title
    Highly mafic amphibolites in the Moldanubian Zone of the Bohemian-Moravian Heights (Českomoravská vrchovina)
Statement of responsibility
    Dušan Němec
Other titles
    Vysoce mafické amfibolity moldanubika Českomoravské vrchoviny
Author
    Němec, Dušan, 1927-2001
Language
    anglicky
Source title - serial
    Acta Musei Moraviae, Scientiae geologicae (Časopis Moravského muzea, Vědy geologické)
Vol./nr.
    Vol. 83
Pages
    p. 59-71
Year
    1998
Notes
    7 diagr., 5 tab., 2 s.bibl.
    České resumé
    Zkr. název ser.: Acta Mus. Morav., Sci. geol. (Čas. Morav. Muz., Vědy geol.)
Subject group
    amfiboly
    bazalt typu MORB
    chemismus hornin
    komatiit
    moldanubikum jižních a jihovýchodních Čech
    moldanubikum strážecké
    ortoamfibolit
    petrogeneze
    protolit
Geographical name
    Břevnice (Havlíčkův Brod)
    Chýnov (Tábor)
    Česká republika
    Dolní Hořice (Tábor)
    Křižanov (Žďár nad Sázavou)
    Lejčkov (Tábor)
    Měřín (Žďár nad Sázavou)
    Oblajovice (Tábor)
    Věžná (Pelhřimov)
Keyword
    Amphibolites
    Bohemian-Moravian
    Českomoravská
    Heights
    Highly
    Mafic
    Moldanubian
    Vrchovina
    Zone
Abstract (in english)
   In the Chýnov zone which encompasses the area E of the town of Tábor and belongs to the Moldanubian Varied series, highly mafic amphibolites occur that are almost monomineral. They are associated with marginal-sea-type metasediments, forming there very long and narrow layers. Their chemistry points to an igneous rock which evidently was originally part of a volcanosedimentary complex. Their chemical composition recalls basaltic komatiites. However, other members of the komatiite series, particularly the peridotite metakomatiites, which are the parent rock of the komatiite series, are completely lacking in the Chýnov zone, the highly mafic amphibolites being in contrast asociated there with metatholeiites. The content of femic minerals in the original igneous rock must have been higher than in primitive MORBs. Thus, they probably were olivine- and clinopyroxene-enriched accumulative magmas.
   This opinion is supported by the fact that several amphibolites of the Chýnov zone contain intercalations of olivine-chlorite-tremolite-actinolite schists which are assumed by MACHART (1984) to have been originally cogenetic olivine-pyroxene-plagioclase cumulates
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    13. 2. 2008
Import date
    8. 8. 2012