Record details

Title
    Roztoky Intrusive Centre in the České Středohoří Mts.: Differentiation, emplacement, distribution, orientation and age of dyke series
Statement of responsibility
    Jaromír Ulrych, Kadosa Balogh
Author
    Balogh, Kadosa
    Ulrych, Jaromír
Language
    anglicky
Source title - serial
    Geologica carpathica
Vol./nr.
    Vol. 51, no. 6
Pages
    s. 383-397
Year
    2000
Notes
    7 obr., 6 tab., 2 s.bibl.
    il.
    Zkr. název ser.: Geol. carpath.
Subject group
    alkalický syenit
    bostonit
    camptonit
    chemismus hornin
    dajkový roj
    datování K/Ar
    essexit
    fonolit
    intruze
    kaldera
    orientace
    tefrit
    terciér
    trachybazalt
    trachyt
    vulkanity Českého středohoří
Geographical name
    ČR-Čechy
    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)
Keyword
    Age
    Centre
    České
    Differentiation
    Distribution
    Dyke
    Emplacement
    Intrusive
    Mts
    Orientation
    Roztoky
    Series
    Středohoří
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)
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    13. 7. 2007
Import date
    8. 8. 2012