Record details

Title
    Alkaline Ultramafic Sill at Dvůr Králové nad Labem, Eastern Bohemia : Petrological and Geochemical Constraints
Statement of responsibility
    Jaromír Ulrych, Pavel Povondra, Edvín Pivec, Jozef Rutšek, Jiří Bendl, István Bilik
Author
    Bendl, Jiří
    Bilik, István
    Pivec, Edvín
    Povondra, Pavel, 1924-
    Rutšek, Jozef
    Ulrych, Jaromír
Language
    anglicky
Source title - serial
    Acta Universitatis Carolinae, Geologica
Vol./nr.
    Vol. 40, no. 1
Pages
    p. 55-81
Year
    1996
Notes
    10 obr., 6 tab., 4 s.bibl.
    Zkr. název ser.: Acta Univ. Carol., Geol.
Subject group
    alkalický typ
    chemismus hornin
    chemismus minerálů
    facie geochemická
    minerály horninotvorné
    neovulkanity
    sill
    ultrabazika
Geographical name
    ČR-Čechy
    Dvůr Králové nad Labem
Keyword
    Alkaline
    Bohemia
    Constraints
    Dvůr
    Eastern
    Geochemical
    Králové
    Labem
    Petrological
    Sill
    Ultramafic
Abstract (in english)
   Alkaline ultramafic sill belonging to the young alkaline province of the Bohemian Massif has been drilled on the right bank of Labe river at Dvůr Králové n.L. It is formed by inhomogenous olivine clinopyroxenite with schlieren of clinopyroxenite and pegmatic alkali clinopyroxenite, sporadically developed in an amygdaloidal facies. The crystallization of the rock includes following stages: - deep magmatic (olivine, diopside/fassaite, Al-Mg-Ti-magnetite, plagioclase?, melilite?); - late magmatic (phlogopite/tetraferriphlogopite, aegirine, grossular, Ti-magnetite, perovskite, fluorapatite); - postmagmatic (chlorite, antigorite, talc, thomsonite, albite, kaolinite group minerals, crandalite, calcite, Nb-anatase, barite, strontianite?, leucoxene, pyrite). Mineral Rb/Sr isochron (cpx-per-phl) of the olivine clinopyroxenite gives Late Cretaceous age (69 4 Ma) and (87Sr/86Sr)i=0.70314 refelcts an uncontamined primary mantle magma sources (sublithospheric HIMU OIB mantle plume).
   High Mg-values (68-85) and contents of compatible elements such as CR 500, Ni 300, Co 70, Sc 30 ppm as well as the low Rb/Sr (0.05) of the non-altered major rock type of the sill suggest the primitive magma of mantle origin. The age, structural position and the crystallization history associate the sill with intrusions accompanying the Lužice fault system
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    21. 3. 2008
Import date
    8. 8. 2012