Record details

Title
    Dioritické horniny v moldanubickém (jihočeském) batolitu (32-22 České Budějovice, 32-24 Trhové Sviny, 33-11 Třeboň)
Statement of responsibility
    František V. Holub, Dobroslav Matějka, Friedrich Koller
Other titles
    Dioritic rocks of the South Bohemian (Moldanubian) Batholith
Author
    Holub, František V.
    Koller, Friedrich
    Matějka, Dobroslav
Language
    česky
Source title - serial
    Zprávy o geologických výzkumech v roce 2002
Pages
    s. 19-20
Year
    2003
Notes
    2 obr., 7 bibl.
    Anglické resumé
    il.
    Zkr. název ser.: Zpr. geol. Výzk. v Roce 2002.
Subject group
    batolit
    chemismus hornin
    diorit
    draslík
    geologie regionální
    mapa geologická
    moldanubický pluton
    složení alkalicko-vápenaté
Geographical name
    ČR-Čechy
    Rakousko-Oberösterreich
Keyword
    32-22
    32-24
    33-11
    Batolitu
    Budějovice
    České
    Dioritické
    Horniny
    Jihočeském
    Moldanubickém
    Sviny
    Trhové
    Třeboň
Abstract (in english)
   Besides the highly prevailing granites, the South Bohemian (Moldanubian) Batholith (SBB) comprises several satellite bodies of more mafie composition. Our research has been focused on petrographic and geochemical correlation of dioritic rocks frora Chlum and Třebonín-Velešín in S Bohemia with those occurring in Austria (Gebharts). These rocks correspond to hornblende-biotite diorite, quartz diorite and even tonalite; the K-feldspar bearing varieties are quartz monzonites to granodiorites. Durbachite has been found in a close spatial association to dioritic rocks within the Třebonín-Velešín massif. All the dioritic rocks under study are relatively rich in potassium and correspond with the high-K calc-alkaline to shoshonitic series. They share many compositional features with some redwitzites from W and SW marginal parts of the Bohemian Massif. Dioritic rocks of the Třebonín and Gebharts massifs are more potassic compared to the Chlum massif.
   A simple crystal fractionation model cannot explain the chemical variations and a role of enriched mantle sources combined with interaction of the mantle-derived magmas with material of the Continental crust are proposed. Some transitional rock varieties could originate by mixing of the ultrapotassic (durbachite) and K-rich calc-alkaline (dioritic) magmas. We believe that mantle-derived mafic magmas and their thermal input contributed to the origin of the SBB substantially
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    29. 5. 2007
Import date
    8. 8. 2012