Record details

    Analýza organické hmoty z tmavě zbarvených vápenců Velkolomu Čertovy schody-západ
Statement of responsibility
    Juraj Franců, Eva Franců, Zbyněk Boháček, Jindřich Hladil, Pavel Bosák
Other titles
    The analysis of organic matter from dark coloured limestones in the Velkolom Čertovy schody-západ
    Boháček, Zbyněk
    Bosák, Pavel, 1951-
    Franců, Eva
    Franců, Juraj, 1957-
    Hladil, Jindřich, 1953-
Source title - serial
    Český kras
    Roč. 27
    s. 30-33
    1 obr., 1 tab., 9 bibl.
    Anglické resumé
    Zkr. název ser.: Čes. Kras
Subject group
    hydrotermální podmínky
    organická substance
    pražská pánev
    uhlovodíky alifatické
Geographical name
    Koněprusy (Beroun)
Abstract (in english)
   Dark coloured, coarse-grained, organodetrital type of the Koněprusy Limestones (Pragian, Lower Devonian) from the quarry of Velkolom Čertovy schody - Quarry West (Koněprusy area, Bohemian Karst) were analysed. The analysis of organic matter proved, that following phases of rock evolution can be detected: phase of deposition, phase of hydrothermal mobilisation, phase of deposition in inclusions of crystallizing carbonate. The composition of organic compounds in impregnations of bryozoans and corals corresponds to the sedimentary material derived from Lower Paleozoic plankton, probably of Lower Devonian age, nevertheless, Ordovician to Silurian ages cannot be excluded. Phytane dominance over pristane indicates probable reduction and salline sedimentary environments.
   The migration of organic matter took part both during the diagenesis of host-rock (Lower Devonian, Pragian) and during the origin of hydrothermal veins bringing material from the depth, causing metasomatic alterations of partly cemented rocks and vein crystallization penetrating fully cemented rock. The youngest structures are represented by neptunian dykes and speleothems of Middle Devonian (the Kačák event) cutting even studied veins. According to pyrolysis, the rock temperature during the bitumen deposition can be estimated up to 90-120°C
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    2. 7. 2007
Import date
    8. 8. 2012