Record details

Title
    Stratigraphy, geochemistry and origin of Silurian black graptolitic shales of the Carnic Alps
Author
    Pašava, Jan
    Schönlaub, H.
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Abhandlungen der Geologischen Bundesanstalt
Vol./nr.
    Roč. 56, č. 1
Pages
    8
Year
    1999
Thesaurus term
    geochemistry,stratigraphy, black shales, Austria,Alps
Keyword
    Alps
    Black
    Carnic
    Geochemistry
    Graptolitic
    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 maturecalcareous shales together with carbonates dominated. The termination of basinal subsidence in Upper Silurian (Ludlow-Pridoli), has resulted in the deposition of chemically well mature graptolitic shales. Sulphidic graptoliticshales were mostly deposited in restricted 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
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014