Record details

Title
    Hydrotermální kalcitové žíly a předkřídové korozní tvary v prostoru Velkolomu Čertovy schody (první výsledky)
Statement of responsibility
    Antonín Zeman, Václav Suchý, Petr Dobeš, Jana Hladíková, Ivana Jačková, Pavel Bosák
Other titles
    Hydrothermal Calcite Veins and Pre-Cretaceous Corrosional Forms in the Čertovy Schody Quarry (Beroun District, the Bohemian Karst) (First Results)
Author
    Bosák, Pavel, 1951-
    Dobeš, Petr
    Hladíková, Jana
    Jačková, Ivana
    Suchý, Václav
    Zeman, Antonín
Language
    česky
Source title - serial
    Český kras
Vol./nr.
    Roč. 23
Pages
    s. 33-40
Year
    1997
Notes
    1 obr.
    Anglické resumé
    Dokument není součástí fondu knihovny ČGS - ke zpracování zapůjčil Dr. P. Budil (ČGS)
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Čes. Kras
Subject group
    Barrandien
    chemismus hornin
    dajka
    geologie regionální
    hydrotermální alterace
    kalcit
    koroze
    kras
    křída
Geographical name
    Český kras
    ČR-Čechy
    Koněprusy (Beroun)
Keyword
    Čertovy
    Hydrotermální
    Kalcitové
    Korozní
    Prostoru
    První
    Předkřídové
    Schody
    Tvary
    Velkolomu
    Výsledky
    žíly
Abstract (in english)
   Impressive, bedding-normal, northsouth-striking calcite vein crosscutting Devonian carbonate sequences was exposed during mining operations in the eastern sector of the Čertovy schody Quarry, the Beroun District. Fluid inclusion and stable isotope data provide an evidence that the vein calcite precipitated at 55-84°C, from saline brines of presumably hydrothermal origin. Mn-minerals, chalcedonic silica and minor sulphides associate with calcite in some samples. Field observation reveal that the process of veining was accompanied by an extensive dissolution of enclosing carbonate sequences. This is indicated by a number of corrosive and dissolution features including unusual subvertical, several dozen metres deep cavities that link spatially to the calcite vein. Most of the large dissolution cavities are filled with Tertiary and Upper Cretaceous clastic and clayey sediments.
   Some of the cavities, however, also contain a thick sequence of apparently pre-Upper Cretaceous clayey and sandy deposits that were locally preserved beneath the Cretaceous transgressive cover. We further speculate that many other dissolution features and caves which are common in carbonate sequences elsewhere in the Barrandian basin may have also been, at least in part, of hydrothermal origin
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    19. 11. 2008
Import date
    8. 8. 2012