Record details

    Rock-forming minerals of alkaline volcanic series associated with the Cheb-Domažlice Graben, West Bohemia
    Balogh, K.
    Buda, G.
    Lloyd, F. E.
    Novák, Jiří Karel
    Ulrych, Jaromír
Publication type
    článek v odborném periodiku
Source title - serial
    Acta Universitatis Szegediensis. Acta Mineralogica - Petrographica
    Roč. 43, -
    s. 1-18
    Projekt: GA205/99/0907, GA ČR
    Projekt: T 014961, Hungarian Academy of Sciences Foundation, HU
    Rozsah: 18 s.
    Výzkumný záměr: CEZ:AV0Z3013912
Subject category
    Bohemian Massif
    rock-forming minerals
Abstract (in english)
   Two coexisting cogenetic volcanic series have been recognised in W Bohemia: weakly and strongly alkaline series. Early crystallization in the mafic rocks is manifested by olivine phenocrysts (Fo66-76), melilite, Ti-magnetite and (Ti, Fe+)-diopside to fassaite; in the intermediate rocks by diopside; and in the felsic rocks by (Mn, Ti)-magnetite, diopside, and high-temperature K-oligoclase (phenocryst cores). Continuing to late crystallisation in mafic to intermediate rocks in represented by kaersutite, nepheline (at T<700oC; also occurs with melilite in ijolite ongoing crystallisation is characterised by Mn-magnesioriebeckite, Mn-winchite and Mg-biotite; feldspars are prevalently anorthoclase (perthite), which occasionally mantles K-oligoclase and is succeeded by Na-sandine. Feldspars and quartz in the matrix of the felsic rocks terminate crystallization.
    AV ČR Brno, Geologický ústav
Contributor code
    AV ČR, GLÚ
Source format
Import date
    8. 8. 2012