Record details

    Regional Distribution of Chromium and Nickel in Moldanubian MORB-derived Amphibolites of the Bohemian-Moravian Heights
Statement of responsibility
    Dušan Němec
    Němec, Dušan, 1927-2001
Source title - serial
    Scripta facultatis scientiarum naturalium Universitatis Masarykianae brunensis
    Vol. 25
    p. 21-35
    2 obr., 9 diagr., 3 s.bibl.
    Anglické resumé
    Zkr. název ser.: Scr. Univ. Masaryk. brun., Geol.
Subject group
    bazalt typu MORB
    migrace prvků
    původ plášťový
Geographical name
    Česká republika
Abstract (in english)
   Many amphibolite bodies occur within the Moldanubian Complexes of the Bohemian-Moravian Heights (Českomoravská vrchovina). They mostly represent N-type MORBs metamorphosed to higher zones of the almandine-amphibolite facies. A noticeble decrease of Cr and Ni, respectively, from 585 to 100 ppm and from 275 to 37 ppm, is observed in them from W to E. Concomitantly also the mg numbers and their bulk rock chemistry change. The Cr and Ni contents of the amphibolites show relations to the pre-metamorphic modes of the rocks (as it can be deduced from their CIPW norms), because they are controlled by the presence or absence of olivine and clinopyroxene, the main carriers of Ni and Cr, respectively, in the rocks. The probably cause of their regional zonation is magmatic differentiation of a primordial basalt magma generated by 15-20% partial melting of a mantle source
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    16. 1. 2008
Import date
    8. 8. 2012