Record details

    Extreme sulfur isotopic fractionation between sulfate of carbonate fluorapatite and authigenic pyrite in the Neocomian sequence at Wawal, Central Poland
Statement of responsibility
    Pawel Marek Lesniak, B. Lacka, K.P. Krajewski, P. Zawidzki, Jana Hladíková
    Hladíková, Jana
    Krajewski, K. P.
    Lacka, B.
    Lesniak, Pawel Marek
    Zawidzki, P.
Source title - serial
    Chemical geology (including isotope geoscience)
    Vol. 200, no. 3-4
    p. 325-337
    7 obr., 2 fot., 1 tab., 2 s. bibl.
    Zkr. název ser.: Chem. Geol. (Isotope Geosci.)
Subject group
    frakcionace izotopická
    izotopy C
    izotopy O
    izotopy S
    izotopy stabilní
    proces biogenní
Geographical name
Abstract (in english)
   The isotopic study (S, O, C) of carbonate fluorapatite (CFA) and pyrite in the Neocomian sequence at Wawal, Polish Lowland, provides a rare occasion to understand factors that controlled fractionation between these phases in the process of bacterial sulfate reduction (BSR). Sulfur isotopic composition of CFA-sulfate is moderately enriched in 34S, but pyrite is highly depleted in 34S with respect to initial Neocomian seawater. We found that the extent of sulfur fractionation between CFA sulfate and sulfur in accompanying framboidal sulfides is larger ("about" 70 per mille) than can be derived by bacterial activity ("about" 46 per mille). Isotopic composition of CFA-sulfate (delta 18O(SO42-)) indicated that SO4-H2O equilibration could proceed relatively easily in early diagenetic events of Neocomian sediments, due to probable bacterial activity.
   We speculate how the isotopic data delta34S(SO42-), delta18O(SO42-), delta 13C(CO32-) translates into the successive oxidation-reduction processes coupled to CFA and pyrite precipitation
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    28. 3. 2008
Import date
    8. 8. 2012