Record details

    The evolution of karst and caves in the Koněprusy Region (Bohemian Karst, Czech Republic). Part III, Collapse structures
Statement of responsibility
    Pavel Bosák
Other titles
    Papers presented at 8th International Karstological School "CLASSICAL KARST - COLLAPSE DOLINES", Postojna, June 26-29th, 2000 (Variant.)
    Razvoj krasa in jam na ozemlju Koněprusy (Češki Kras, Češka), III. Del: Udorne strukture
    Bosák, Pavel, 1951-
Source title - serial
    Acta carsologica
    Vol. 29, no. 2
    p. 35-50
    2 obr., 4 fot., 3 s.bibl.
    Zkr. název ser.: Acta carsol. (Ljubljana)
Subject group
    česká křídová pánev
    hydrotermální podmínky
    krasová výplň
    kvartér pražské plošiny
    vltavo-berounský faciální vývoj
Geographical name
    Koněprusy (Beroun)
Abstract (in english)
   Vertical and subvertical pipse are circular to ovate in shape with diameters from 2-4 m up to tens of metres and with proven depth up to 82 m. Some of them terminate by horizontal cave levels at depth. Pipes are filled with complicated sedimentary sequences with clearly developed collapse structure. The fill is composed of pre-Cenomanian, Cenomanian-Turonian and Tertiary deposits. Internal structures of the fill indicate multiphase collapses. Cretaceous and pre-Cretaceous deposits are often subvertical with chaotic internal texture. In the centre of some of pipes, there are traces of younger collapses, most probably induced by continuing karstification and suffosion at depth. Tertiary deposits overlay the Cretaceous ones unconformably; they show gentler centripetal inclination, but in places they fill the central parts of collapsed fill.
   The origin of solution pipes is connected with hydrothermal activity most probably during Paleogene to Miocene, when the surface of limestones was still covered by slightly eroded cover of Upper Cretaceous platform sediments. Hydrothermal karst forms developed up to the surface of limestones as the piezometric level was situated within the Cretaceous cover. After the lost of buoyancy support of water, sedimentary cover started to move (collapse) down
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    16. 8. 2007
Import date
    8. 8. 2012