Podrobnosti záznamu

Název
    Ochtiná Aragonite Cave (Western Carpathians, Slovakia): morphology, mineralogy of the fill and genesis
Údaj o odpovědnosti
    Pavel Bosák, Pavel Bella, Václav Cílek, Derek C. Ford, Helena Hercman, Jaroslav Kadlec, Armstrong Osborne, Petr Pruner
Autor
    Bella, Pavel
    Bosák, Pavel, 1951-
    Cílek, Václav, jr.
    Ford, Derek C.
    Hercman, Helena
    Kadlec, Jaroslav
    Osborne, Armstrong
    Pruner, Petr
Jazyk
    anglicky
Zdrojový dokument - seriál
    Geologica carpathica
Svazek/č.
    Roč. 53, č. 6
Strany
    s. 399-410
Rok
    2002
Poznámky
    5 obr., 4 tab., 46 bibl.
    il.
    Zkr. název ser.: Geol. carpath.
Předmětová skupina
    aragonit
    asociace minerální
    datování Th/U
    jeskyně
    kras
    kvartér Západních Karpat
    speleologie
    speleotém
    Západní Karpaty
Geografické jméno
    Ochtiná (Slovensko)
    Slovensko
    Slovenský kras
Klíčové slovo
    Aragonite
    Carpathians
    Cave
    Fill
    Genesis
    Mineralogy
    Morphology
    Ochtiná
    Slovakia
    Western
Abstrakt (anglicky)
   Ochtiná Aragonite Cave is a 300 m long cryptokarstic cavity with simple linear sections linked to a geometrically irregular spongework labyrinth. The metalimestones, partly metasomatically altered to ankerite and siderite, occur as isolated lenses in insoluble rocks. Oxygen-enriched meteoric water seeping along the faults caused siderite/ankerite weathering and transformation to ochres that were later removed by mechanical erosion. Corrosion was enhanced by sulphide weathering of gangue minerals and by carbon dioxide released from decomposition of siderite/ankerite. The initial phreatic speleogens, older than 780 ka, were created by dissolution in density-derived convectional cellular circulation conditions of very slow flow. Thermohaline convection cells operating in the flooded cave might also have influenced its morphology. Later vadose corrosional events have altered the original form to a large extent.
   Water levels have fluctuated many times during its history as the cave filled during wet periods and then slowly drained. Mn-rich loams with Ni-bearing asbolane and birnessite were formed by microbial precipitation in the ponds remaining after the floods. Allophane was produced in the acidic environment of sulphide weathering. La-Nd-phosphate and REE enriched Mn-oxide precipitated on geochemical barriers in the asbolane layers. Ochres containing about 50 wt. per cent of water influence the cave microclimate and the precipitation of secondary aragonite. An oldest aragonite generation is preserved as corroded relics in ceiling niches truncated by corrosional bevels. Thermal ionisation mass spectrometry and alpha counting U series dating has yielded ages of about 500-450 and 138-121 ka, indicating that there have been several episodes of deposition, occurring during Quaternary warm periods (Elsterian 1/2, Eemian).
   Spiral and acicular forms representing a second generation began to be deposited in Late Glacial (14 ka - Alleröd) times. The youngest aragonite, frostwork, continues to be deposited today. Both of the. younger generations have similar isotopic compositions, indicating that they originated in conditions very similar, or identical, to those found at present in the cave
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    24. 10. 2007
Datum importu
    8. 8. 2012