Record details

    Vinařická hora Hill Cenozoic Composite Volcano, Central Bohemia: Geochemical Constraints
Statement of responsibility
    Zdeněk Řanda, Jiří K. Novák, Kadosa Balogh, Jaroslav Frána, Jan Kučera
Other titles
    HIBSCH 2002 Symposium, Teplá near Třebenice, Ústí nad Labem, Mariánské Lázně, Czech Republic, June 3-8, 2002 (Variant.)
    Balogh, Kadosa
    Frána, Jaroslav
    Kučera, Jan
    Novák, Jiří K.
    Řanda, Zdeněk
    Ulrych, Jaromír
Source title - serial
    Vol. 15
    p. 126-132
    5 obr., 2 tab., 29 bibl.
    Zkr. název ser.: Geolines (Praha)
Subject group
    chemismus hornin
    datování K/Ar
    kenozoické vulkanity Českého masivu
    původ plášťový
Geographical name
    Pražská plošina-Vinařická hora
Abstract (in english)
   Olivine-poor nephelinite of Vinařická hora Hill substantially differs from both olivine nephelinite and olivine-free nephelinite of the Cenozoic volcanic province of the Bohemian Massif. Vinařická hora Hill represents a volcanic relict 31.0-25.5 Ma in age located in the Bohemian Cretaceous Basin in central Bohemian area. The very low Mg-values (46.6-49.7), low contents of compatible elements such as Cr (4.9-23.3), Ni (3-55), Co (39-43), Sc (17.0-18.6) (all data in microg g-1) and the lack of mantle-type xenoliths evidence differentiation of primary mantle magma. Anomalous enrichment in incompatible elements, particularly in sigma REE (523-589), Zr (601-842), U (2.1-3.1), Th (11.6-13.0), Nb (176-188), Ta (10.5-11.2), is associaled with magmatic differentiation manifested in crystallization of apatite, Ti-magnetite+- hauyne(?).
   Olivine-poor nephelinite could be derived from carbonated nephelinite magma with high CO2/H2O + CO2 volatile fraction resulling in high viscosity and consequent stopping of magma associated with differentiation and contamination in a crustal reservoir during its ascent to the surface. Such magma could be associated with a highly explosive pyroclast-rich complex volcano of stratovolcanic type. The olivine-poor nephelinite of Vinařická hora Hill belongs to a speciflc group of nephelinites of the Bohemian Massif characteristically developed in central Bohemia
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    13. 2. 2008
Import date
    8. 8. 2012