Podrobnosti záznamu

Název
    Chemical composition of the crinoid skeletal remains (Echinodermata) in weathered limestones of the Bohemian Lower Devonian (Barrandian area)
Údaj o odpovědnosti
    Václav Petr, Rudolf J. Prokop, Martin Mihaljeviič, Ondřej Šebek
Další názvy
    Chemické složení kosterních elementů krinoidů (Echinodermata) ve zvětralých partiích vápenců českého spodního devonu (Barrandien)
Autor
    Mihaljeviič, Martin
    Petr, Václav
    Prokop, Rudolf J.
    Šebek, Ondřej
Jazyk
    anglicky
Zdrojový dokument - seriál
    Journal of the Czech Geological Society
Svazek/č.
    Vol. 42, no. 1-2
Strany
    p. 41-58
Rok
    1997
Poznámky
    48 obr., 3 s.bibl.
    České resumé
    Zkr. název ser.: J. Czech geol. Soc.
Předmětová skupina
    Barrandien
    biogeochemie
    devon-spodní
    Echinodermata
    Echinoidea
    izotopy C
    izotopy O
    kosti
Geografické jméno
    ČR-Čechy
    Karlštejn
    Koněprusy
    Praha
Klíčové slovo
    Area
    Barrandian
    Bohemian
    Chemical
    Composition
    Crinoid
    Devonian
    Echinodermata
    Limestones
    Lower
    Remains
    Skeletal
    Weathered
Abstrakt (anglicky)
   The authors give a brief report on the chemical composition of Lower Devonian crinoid skeletal remains and a preliminary interpretation of it. An enormous body of isolated crinoid ossicles from various localities of the Barrandian "white beds" was collected and 40 samples were prepared for chemical analysis. It was proved that the fossil crinoid ossciles are uniformly low-Mg calcite regardless their stratigraphical position or regional geologic condition. In the samples the Fe, Pb, Zn, Cu, Mn, Sr, Li, Na, K, MgO, CaO contents and the insoluble residue were established. The observations have verified that some parts of the living Palaeozoic crinoid body had accumulated certain trace metals. Results of the analyses convincingly demonstrated that the Barrandian crinoids exhibited biomagnification of certain elements and were probably very important in the cycling of trace metals in the sea.
   Finally, 12 stable isotopic samples (40 measurements), were analyzed, including crinoid brachials, crinoid columnals, brachiopod shell and samples of the rock. No palaeotemperature records were established. From our results it seems that an alteration of the original isotopic signal in a diagenetic environment open to meteoric water could explain the relatively low 18O and high 13C (related to the PDB standard)t. However, the geochemical as well as the stable isotopic interpretations are only preliminary and left open to question
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    7. 3. 2008
Datum importu
    8. 8. 2012