Record details

    Geochemistry of the amphibolites of the Moravicum of the Svratka dome
Statement of responsibility
    Dávid Willimský
    Willimský, Dávid
Source title - serial
    Vol. 27
    p. 131-175
    1 obr., 11 diagr., 2 fot.
    Bibliografie na s. 172-174
    České resumé
    Zkr. název ser.: Krystalinikum
Classfication no.
Conspectus category
Subject group
    analýza petrografická
    bazalt typu MORB
    chemismus hornin
    geologie regionální
    prvky hlavní
    prvky stopové
    svratecká klenba
    vzácné zeminy
Geographical name
    Borač (Žďár nad Sázavou, Bystřice nad Pernštejnem)
    Doubravník (Žďár nad Sázavou, Bystřice nad Pernštejnem)
    Křoví (Žďár nad Sázavou, Velké Meziříčí)
    Lhota u Olešnice (Blansko, Boskovice)
    Olešnice (Blansko, Boskovice)
    Velká Bíteš (Žďár nad Sázavou, Velké Meziříčí)
Abstract (in english)
   The subject of the present study is the amphibolites that occur in the Olešnice and Bíteš of the Moravicum of the Svratka dome. The Olešnice Group is formed by metamorphosed neritic sedimentary facies mainly composed of any types of para-gneiss, micashists and phyllites. The Bíteš Group consists predominantly of biotite-muscovite ortho-gneiss. In these two completely different groups the amphibolites represent minor rock types of have a different geological position and petrographical and geochemical features. In the Olešnice Group the amphibolites create conform bodies of variable thickness that represent constituents of a variagated meta-sedimentary sequence. They probably rose concurrently with the formation of the primary basin. On a large scale the body of the amphibolites in the Moravian hills consists of three clearly identifiable fundamental types of amphibolites. They differ in grain size, texture and partly in mineral composition.
   The main rock types are fine to medium grained quartz amphibolites, the minor constituent are fine grained quartz amphibolites and medium grained amphibolites with residual ophitic texture (metagabbros). The geochemical features of these amphibolites suggest that their protolith can be regarded as tholeiitic basalts. the distribution of the major, trace and rare earth elements is very similar to that of recent transitional to enriched mid-ocean ridge basalts. The epidote amphibolites from the southern part of the Olešnice Group represent a petrographically and geochemically different rock type which evolved by the metamorphism of the tholeiitic basalt with N-type MORB geochemical features.
   On the basis of the geochemical variability of the amphibolites, their geological position and character of the Olešnice Group as a whole we may presume that the primary clusters of amphibolites arose by melting of a partly enriched mantle source in geotectonic very similar to that of the recent back-arc basins.
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    31. 3. 2006
Import date
    8. 8. 2012