Record details

    Dyke Swarm Pattern and Tectonics in the České Středohoří Mts. Volcanic Centre, Ohře (Eger) Rift, Central Europe (Starting Points for Further Research)
Statement of responsibility
    Vladimír Cajz
Other titles
    HIBSCH 2002 Symposium, Teplá near Třebenice, Ústí nad Labem, Mariánské Lázně, Czech Republic, June 3-8, 2002 (Variant.)
    Cajz, Vladimír
Source title - serial
    Vol. 15
    p. 15-22
    6 obr., 1 tab., 13 bibl.
    Zkr. název ser.: Geolines (Praha)
Subject group
    alkalický typ
    dajkový roj
    kontrola tektonická
    orientace přednostní
    tlak orientovaný
    vulkanické pásmo
    vulkanity Českého středohoří
    zóna riftová
Geographical name
    Roztoky (Ústí nad Labem)
Abstract (in english)
   Orientation data on the radiating dyke swarm of lamprophyres, semilamprophyres, felsic derivates and common basaltic rocks in the area of the volcanic centre of the České středohoří Mts. obtained from field survey were compared with the newly recognized tectonics inside the superficial volcanic products of the complex. Strike E-W is the most common in all rock groups of the dyke swarm and strike N-S is frequent for dykes of the lamprophyre and semilamprophyre groups. Strikes NNW-SSE and NW-SE to WNW-ESE are present in all groups, too. Faults show the same strike. Orientations of steeply inclined dykes, compared with the strikes of faults, support the idea that the dyke emplacement was controlled by syngenetic regional stress regime using pre-existing rupture systems. No structures induced by formerly supposed diapiric effect ofthe hypabyssal (essexitic) and/or carbonatitic intrusions were proved.
   The inclination data of moderately inclined dykes indicate their emplacement into a paired fracture system striking NW-SE and NE-SW to NNE-SSW. A change in regional stress regime is presumed during the development of the dyke swarm. The radiating shape of the swarm can be explained as the only spatial connection belween the hypabyssal intrusions/trachytic vent and dykes (using similar space for magma ascent) -not the structural-genetic one, e.g.: the magma ascent of the dyke swarm rocks was controlled by existing stress regime without applicalion of any updoming and the dyke swarm is radiating in its shape only. Orientations of newly identified faults correspond to the model of the blocky-structure setting inside the rift area
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    15. 6. 2007
Import date
    8. 8. 2012