Record details

Title
    Mafic K- and Mg-Rich Magmatic Rocks from the Western Mühlviertel (Austria) Area and the Adjacent Part of the Šumava Mountains (Czech-Republic)
Author
    Breiter, Karel
    Koller, F.
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Geologische Bundesanstalt. Jahrbuch
Vol./nr.
    Roč. 149, č. 4
Pages
    s. 477-485
Year
    2009
Notes
    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
    durbachite
    glimerite
    granitoid
    Moldanubicum
    Upper Austria
Keyword
    Adjacent
    Area
    Austria
    Czech-Republic
    K-
    Mafic
    Magmatic
    Mg-Rich
    Mountains
    Mühlviertel
    Rocks
    Šumava
    Western
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.
Contributor
    AV ČR Brno, Geologický ústav
Contributor code
    AV ČR, GLÚ
Source format
    U
Import date
    8. 8. 2012