Record details

Title
    Stratigraphy, geochemistry and origin of Silurian black graptolitic shales of the Carnic Alps (Austria). Geologie ohne Grenzen - Festschrift 150 Jahre Geologische Bundesanstalt
Statement of responsibility
    Jan Pašava, Hans Peter Schönlaub
Other titles
    Stratigraphie, Geochemie und Ablagerungsbedingungen der Graptolitenschiefer des Silurs der Karnischen Alpen (Österreich)
Author
    Pašava, Jan
    Schönlaub, Hans Peter
Language
    anglicky
Source title - serial
    Abhandlungen der Geologischen Bundesanstalt
Vol./nr.
    Vol. 56, no. 1
Pages
    p. 317-324
Year
    1999
Notes
    10 obr., 3 tab., 31 bibl.
    Německé resumé
    Zkr. název ser.: Abh. Geol. Bundesanst. (Wien)
Subject group
    břidlice černá
    chemismus hornin
    facie
    silur
Geographical name
    Rakousko-Kärnten
Keyword
    150
    Alps
    Austria
    Black
    Bundesanstalt
    Carnic
    Festschrift
    Geochemistry
    Geologie
    Geologische
    Graptolitic
    Grenzen
    Jahre
    Ohne
    Origin
    Shales
    Silurian
    Stratigraphy
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 carbonates dominated. The termination of basinal subsidence in Upper Silurian (Ludlow-Pridoli), has resulted in the deposition of chemically well mature graptolotic shales. Sulphidic graptolitic shales were mostly deposited in restricted marine environemnt (low O2 concentrations) with local periods of inhospitable bottom conditions (little or no O2 was present and H2S may have been continually or intermittently or intermittently present).
   These facies can be classified as metalliferous black shales and represent a potential environmental hazard especially in area carbonate lithology is missing
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    19. 2. 2008
Import date
    8. 8. 2012