Podrobnosti záznamu

Název
    The evolution of karst and caves in the Koněprusy region (Bohemian Karst, Czech Republic). Part II : Hydrothermal paleokarst, Papers presented at 5th International School "Classical Karst", Trenta, June 28th-July 1st 1997
Údaj o odpovědnosti
    Pavel Bosák
Další názvy
    Razvoj krasa in jam v Koněprusih (Český kras, Češka republika), II.del: hidrotermalni paleokras
Autor
    Bosák, Pavel, 1951-
Jazyk
    anglicky
Zdrojový dokument - seriál
    Acta carsologica
Svazek/č.
    Vol. 27, no. 2
Strany
    p. 41-61
Rok
    1998
Poznámky
    2 obr., 4 fot., 4 s.bibl.
    res. slovin.
    Zkr. název ser.: Acta carsol. (Ljubljana)
Předmětová skupina
    Barrandien
    devon
    dolomit
    geotermometrie
    hydrotermální podmínky
    inkluze fluidní
    jeskyně
    kalcit
    křída-svrchní
    paleohydrologie
    paleokras
    pražská pánev
    terciér
    uhlovodíky
    vulkanismus
    žíla
Geografické jméno
    ČR-Čechy
    Koněprusy (Beroun)
Klíčové slovo
    1st
    5th
    28th-July
    1997
    Bohemian
    Caves
    Classical
    Czech
    Evolution
    Hydrothermal
    II
    International
    June
    Karst
    Koněprusy
    Paleokarst
    Papers
    Presented
    Region
    Republic
    School
    Trenta
Abstrakt (anglicky)
   The origin of hydrothermal karst cavities was connected with the variscan hydrothermal process. The cavities were formed and filled by crystalline calcite. The process was accompanied by the intensive dolomitisation. Younger phase of hydrothermal karstification was not connected with vein-filling, but with the deep circulation of groundwater, probably associated with neovolcanic activity in the Bohemian Massif. This is supported by pollen grains and decomposed volcanic ash in speleothems which were formed after the major phases of speleogenesis. It is supposed that caves in the Koněprusy Devonian were formed in confined aquifer under phreatic and batyphreatic conditions. Thermal conditions appeared when paleogeothermic gradient was increased due to intensive neovolcanite activity. Hydrothermal karstification partly changed the morphology of caves. The maximum temperatures were stated to 60-70°C from large calcite crystals precipitated under phreatic and deeply phreatic conditions.
   The piezometric level was situated above limestones in Upper Cretaceous platform siliciclastic as indicated by numerous subvertical phreatic tubes ("depression") filled with sunkened Cretaceous and Tertiary sediments after the water buyoancy support decreased. Popcorn-like silicified Koněprusy Rosettes can be result of decrease of thermal water level and mixing with infiltrating meteoric waters. Outer zones of large calcite crystals with precipitation temperatures of about 40°C can indicate the gradual cooling of the whole system
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    28. 1. 2008
Datum importu
    8. 8. 2012