Record details

    Mafic K- and Mg-Rich Magmatic Rocks from the Western Mühlviertel (Austria) Area and the Adjacent Part of the Šumava Mountains (Czech-Republic)
    Breiter, Karel
    Koller, F.
Publication type
    článek v odborném periodiku
Source title - serial
    Geologische Bundesanstalt. Jahrbuch
    Roč. 149, č. 4
    s. 477-485
    Projekt: 2005/2, Czech-Austrian agency for scientific cooperation ACTION, V, AT
    Rozsah: 9 s. : WWW
    Výzkumný záměr: CEZ:AV0Z30130516
Subject category
    Bohemian Massif
    Czech Republic
    Upper Austria
Abstract (in english)
   One large and several small bodies of typical durbachite (SiO2 around 60-65%) appear in the Czech territory to the north of the Vltava valley. Several smaller bodies of extreme basic and mafic varieties of durbachite were newly found on both the Czech and Austrian sides of the state border, N of the town of Schwarzenberg: pyroxene-phlogopite melasyenite (less than 50% SiO2) and amphibole-phlogopite melasyenite (50-55% SiO2). Both varieties contain phenocrysts of K-feldspar in a matrix of oligoclase, phlogopite (xMg=0.58-0.67), and actinolite (xMg=0.67-0.80), occasionally also diopside (xMg=0.74-0.78). Several ultramafic dykes with a content of mafic minerals more than 90% appear in the endo- and exocontact of the Prachatice and Křišťanov granulite bodies. The dyke rocks, termed here as glimmerites, are medium- to fine-grained, composed mainly of phlogopite (xMg 0.65-0.80) and actinolite (xMg=0.75-0.85). Cummingtonite (xMg=0.70-0.75) or diopside (xMg=0.81-0.83) appears only locally.
    AV ČR Brno, Geologický ústav
Contributor code
    AV ČR, GLÚ
Source format
Import date
    8. 8. 2012