Record details

    Roztoky Intrusive Centre in the České Středohoří Mts.: Differentiation, emplacement, distribution, orientation and age of dyke series
Statement of responsibility
    Jaromír Ulrych, Kadosa Balogh
    Balogh, Kadosa
    Ulrych, Jaromír
Source title - serial
    Geologica carpathica
    Vol. 51, no. 6
    s. 383-397
    7 obr., 6 tab., 2 s.bibl.
    Zkr. název ser.: Geol. carpath.
Subject group
    alkalický syenit
    chemismus hornin
    dajkový roj
    datování K/Ar
    vulkanity Českého středohoří
Geographical name
    Dobkovice (Děčín)
    Malé Březno (Ústí nad Labem)
    Něštěmice (Ústí nad Labem)
    Roztoky (Ústí nad Labem)
    Svádov (Ústí nad Labem)
    Těchlovice (Děčín)
    Zubrnice (Ústí nad Labem)
Abstract (in english)
   he Roztoky Intrusive Centre (RIC) is formed by a trachytic crater vent, hypabyssal intrusions, together with more than 1000 almost radially arranged dykes and more rare cone sheets. Hypabyssal Weakly Alkaline Series of essexite (33-31 Ma)-monzodiorite (33-30 Ma)-sodalite syenite (30-28 Ma) and two coexisting weakly [camptonite (31 Ma)/gauteite II? (24 Ma)/trachyte] and strongly alkaline dyke series [camptonite (28 Ma)/monchiquite (26 Ma)-phonolite/tinguaite (26 Ma)/nepheline syenite porphyry cone sheet (30 Ma)] were recognized. Four principal dyke groups were distinguished: I - lamprophyres (58%) dominated over II - semilamprophyres (28%), minor III - basaltic rocks (6%) and IV - felsic derivatives (9%). Both radial steeply dipping dykes of lamprophyres, semilamprophyres, bsaltic and rare phonolitic rocks and flat dipping cone sheets of trachyte and phonolite/nepheline syenite porphyry are present.
   Dykes of (semi)lamprophyres, and basaltic rocks show similar preferred strikes of 90° and 0°; felsic derivates of 330° and 0°. Majority (91-98%) of dykes (100% of felsic dykes) are present within a distance of 7 km from the Roztoky main centre. Joint and dyke patterns are controlled by the regonal paleostress field existing in the upper crust during magma ascent, by orientations of pre-existing fracture sets in the region and by the superimposed local stress field exerted by the rising intrusion. For the interval of 31-26 Ma in the RIC, the analysis of dyke geometries indicates the dominance of regional stress characterized by N-S tension (lamprophyres = semilamprophyres basaltic rocks > felsic derivatives)
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    13. 7. 2007
Import date
    8. 8. 2012