Record details

    Rock-forming minerals of lamprophyres and associated mafic dykes from the Krušné hory/Erzgebirge (Czech Republic)
Statement of responsibility
    Edvín Pivec, František V. Holub, Miloš Lang, Jiří K. Novák, Miroslav Štemprok
Other titles
    Horninotvorné minerály lamprofyrů a příbuzných mafických žilných hornin z Krušných hor (Česká republika)
    Holub, František V.
    Lang, Miloš
    Novák, Jiří K.
    Pivec, Edvín
    Štemprok, Miroslav
Source title - serial
    Journal of the Czech Geological Society
    Vol. 47, no. 1-2
    p. 23-32
    4 obr., 5 tab., 19 bibl.
    České resumé
    Zkr. název ser.: J. Czech geol. Soc.
Subject group
    chemismus hornin
    krušnohorský pluton
    minerály akcesorické
    minerály horninotvorné
    složení mafické
Geographical name
    Erzgebirge (SRN-Sachsen)
    Krušné hory
Abstract (in english)
   Electron microprobe analyses were made on micas, amphiboles, feldspars, chlorites and accessory minerals in lamrophyric dykes (kersantites, minettes, spessartites), and in associated mafic diorite to tonalite porphyries (porphyrites) of the Krušné hory (Erzgebirge) area and Mariánské Lázně region in Western Bohemia (Czech Republic). All studied rocks are altered to various degrees during deuteric and/or postmagmatic stages of evolution. The only primary mafic mineral preserved in all rock types is Mg-biotite to phlogopite, in spessartites and some diorite porphyries also Ti-rich hornblende corresponding to titanian magnesiohastingsite to kaesutite. Magmatic biotites are relatively rich in Ti with limited variations in their Mg/Fe ratios, evidently re-equlibrated during cooling or-heating. Olivine is totally replaced by pilitic pseudomorphs and by biotite-actionolite clots. Phenocrystic clinopyroxene is completely uralitized, often in well-preserved original shapes.
   The secondary amphiboles correspond to Si-rich magnesiohornblende to actinolite. Chlorite and epidote are rather scarce and their important occurrences are restricted to limited number of samples. Instead of chloritization typical of lamprophyres in other parts of the Bohemian Massif, most samples are affected by secindary biotitization. Effects of greisenization sensu stricto were observed in some lamprophyres from Krupka where Li-bearing dark micas rich in Si and Mg originated
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    28. 3. 2008
Import date
    8. 8. 2012