Record details

Title
    Litologie a geochemie silurských graptolitových břidlic v Karnských Alpách (Rakousko)
Statement of responsibility
    Jan Pašava, Hans Peter Schönlaub
Other titles
    Lithology and geochemistry of Silurian black graptolitic shales of the Carnic Alps (Austria)
Author
    Pašava, Jan
    Schönlaub, Hans Peter
Language
    česky
Source title - serial
    Zprávy o geologických výzkumech v roce 1999
Pages
    s. 157-160
Year
    2000
Notes
    1 obr., 1 tab.
    Anglické resumé
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Zpr. geol. Výzk. v Roce 1999.
Subject group
    břidlice černá
    chemismus hornin
    Graptolithina
    mezinárodní spolupráce
    sedimentologie
    silur
Geographical name
    Rakousko
Keyword
    Alpách
    Břidlic
    Geochemie
    Graptolitových
    Karnských
    Litologie
    Rakousko
    Silurských
Abstract (in english)
   The distribution of major and trace elements in Silurian graptolitic shales of the Carnic Alps suggests important changes of depositional environment. With the beginning of the Silurian transgression and progressing subsidence, mostly chemically mature "siliceous" shales with generally higher Zr values were deposited in normal marine environment. The character of sedimentation has rapidly changed during Wenlock when chemically less mature calcareous shales together with carbonate dominated. The termination of basinal subsidence in Upper Silurian (Ludlow-Přídolí), has resulted in the deposition of chemically well mature graptolithic shales. Sulphidic graptolitic shales were mostly deposited inrestricted marine environment (low O2 concentrations) with local periods of inhospitable bottom conditions (little or no O2 was present and H2S may have been continually or intermittently present).
   These facies can be classfied as metalliferous black shales and represent a potential environmental harm especially in areas where carbonate lithology is missing
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    21. 3. 2008
Import date
    8. 8. 2012