Record details

Title
    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
Author
    Boháček, Zbyněk
    Bosák, Pavel, 1951-
    Franců, Eva
    Franců, Juraj, 1957-
    Hladil, Jindřich, 1953-
Language
    česky
Source title - serial
    Český kras
Vol./nr.
    Roč. 27
Pages
    s. 30-33
Year
    2001
Notes
    1 obr., 1 tab., 9 bibl.
    Anglické resumé
    il.
    Zkr. název ser.: Čes. Kras
Subject group
    Barrandien
    barva
    bitumen
    devon-spodní
    hydrotermální podmínky
    kalcit
    kerogen
    organická substance
    pražská pánev
    uhlovodíky alifatické
    vápenec
    zralost
Geographical name
    ČR-Čechy
    Koněprusy (Beroun)
Keyword
    Analýza
    Čertovy
    Hmoty
    Organické
    Schody-západ
    Tmavě
    Vápenců
    Velkolomu
    Zbarvených
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
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    2. 7. 2007
Import date
    8. 8. 2012