Record details

    Chemical composition of the crinoid skeletal remains (Echinodermata) in weathered limestones of the Bohemian Lower Devonian (Barrandian area)
Statement of responsibility
    Václav Petr, Rudolf J. Prokop, Martin Mihaljeviič, Ondřej Šebek
Other titles
    Chemické složení kosterních elementů krinoidů (Echinodermata) ve zvětralých partiích vápenců českého spodního devonu (Barrandien)
    Mihaljeviič, Martin
    Petr, Václav
    Prokop, Rudolf J.
    Šebek, Ondřej
Source title - serial
    Journal of the Czech Geological Society
    Vol. 42, no. 1-2
    p. 41-58
    48 obr., 3 s.bibl.
    České resumé
    Zkr. název ser.: J. Czech geol. Soc.
Subject group
    izotopy C
    izotopy O
Geographical name
Abstract (in english)
   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
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    7. 3. 2008
Import date
    8. 8. 2012