Podrobnosti záznamu

Název
    Origin of barite concretions in the West Carpathian flysch, Poland
Údaj o odpovědnosti
    P.M. Lesniak, B. Lacka, Jana Hladíková, G. Zielinski
Autor
    Hladíková, Jana
    Lacka, B.
    Lesniak, Pawel Marek
    Zielinski, G.
Jazyk
    anglicky
Zdrojový dokument - seriál
    Chemical geology (including isotope geoscience)
Svazek/č.
    Vol. 158, no. 1-2
Strany
    p. 155-163
Rok
    1999
Poznámky
    4 obr., 2 fot., 1 tab., 25 bibl.
    Anglické resumé
    Zkr. název ser.: Chem. Geol. (Isotope Geosci.)
Předmětová skupina
    apatit
    baryt
    flyš
    flyšové pásmo Západních Karpat
    geochemie izotopická
    hydrotermální podmínky
    izotopy O
    izotopy S
    izotopy Sr
    konkrece
    křída
    paleogén
Geografické jméno
    Polsko-Kraków
Klíčové slovo
    Barite
    Carpathian
    Concretions
    Flysch
    Origin
    Poland
    West
Abstrakt (anglicky)
   The Paleogene concretions occurring in the Sub-Silesian nappe of the West Carpathians were investigated to understand their origin and evolution. They were considered previously to be of hydrothermal origin. Three types of concretions were found in marls: (1) phosphorite impregnated, (2) barite impregnatied and (3) composed of the mixed types. The sulphur and oxygen isotope determinations of barite ( 34S between 32 to 36%. and 18O between 20 and 23 %.) as well as the ration 34S/ 18O of 1.5 point out for bacterial reduction of sulphate as the primary cause of enrichment in heavy isotopes of sulphur and oxygen. Another process which could contribute to high 18OSO4 values was sulphate isotope exchange with seawater oxygen. The 87Sr/86Sr compositions of baryte confirmen that they are fairly identical with strontium isotopic composition of Paleogene seawater (0.7076-0.7078).
   Therefore, barite nodules of the Sub-Silesian unit in the flysch Carpathians can not longer be considered as of hydrothermal origin

   The Paleogene concretions occurring in the Sub-Silesian nappe of the West Carpathians were investigated to understand their origin and evolution. Thewere consiedered previously to be of hydrothermal origin. Three types of concretions were found in marls: (1) phosphorite impregnated, (2) barite impregnated and (3) composed of the mixed types. The sulphur and oxygen isotope determinations of barite ( 34S between 32 to 36 %. and 18O between 20 and 23 %.) as well as the ration delta 34S/delta 18O of 1.5 point out for bacterial reduction of sulphate as the primary cause of enrichment in heavy isotopes of sulphur and oxygen. Another process which could contribute to high 18O SO4 values was sulphate isotope exchnage with seawater oxygen. The 87Sr/86Sr compositions of barite confirmed that they are fairly identical with strontium isotopic composition of Paleogene seawater (0.7076-0.7078).
   Therefore, barite nodules of the Sub-Silesian unit in the flysch Carpathians can not longer be considered as of hydrothermal origin
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    13. 2. 2008
    18. 2. 2008
Datum importu
    8. 8. 2012