caa a22 4500 475827317 CHVBK 20180406123832.0 cr unu---uuuuu 170329e20000601xx s 000 0 eng 10.1007/s005310050318 doi (NATIONALLICENCE)springer-10.1007/s005310050318 Geochemical and isotopic composition of organic matter in the Kupferschiefer of the Polish Zechstein basin: relation to maturity and base metal mineralization [Elektronische Daten] [A. Bechtel, R. Gratzer, W. Püttmann, S. Oszczepalski] max: vs the present depth of the Kupferschiefer, soluble organic matter (SOM) yields, and relative proportions of saturated and aromatic hydrocarbons of the SOM provide evidence for an oxidative alteration of organic matter in highly mineralized Kupferschiefer samples near the Rote Fäule zones. This is confirmed by differences in the composition of the saturated and aromatic hydrocarbon fractions of the soluble organic matter: Saturated hydrocarbons from Rote Fäule samples are dominated by short-chain n-alkanes and higher abundances of pristane and phytane relative to heptadecane (n-C17) and octadecane (n-C18), respectively, compared with samples more distant to the Rote Fäule zone. Compositional changes of the aromatic hydrocarbon fractions with decreasing distance to that zone are characterized by the occurrence of polycyclic aromatic hydrocarbons and elevated ratios of phenanthrene to methylphenanthrenes that are attributed to demethylation reactions and resulted in a decrease of the methylphenanthrene index (MPI 1). Kupferschiefer samples from the barren zone of the Polish Basin do not show these alteration patterns. The observed variations in organic matter composition with burial depth are consistent with changes due to increasing thermal maturation. Maturity assessment is achieved from MPI 1 and the methyldibenzothiophene ratio (MDR). From the relationship between the maturity of organic matter in terms of vitrinite reflectance values and depth of the Kupferschiefer strata, a continuous increase in reflectance of vitrinite is obtained within the Polish Basin. The alteration pattern of organic matter related to base metal mineralization of the Kupferschiefer corresponds to changes in the isotopic composition of organic carbon and calcite. Kerogen within, or close to, Rote Fäule zone is enriched in 13C caused by the preferential release of isotopically light organic compounds through progressive degradation of organic matter. The opposite tendency towards lower δ 13C and δ 18O values of calcite provides evidence for isotopic exchange between carbonate and the oxidizing, ore-bearing solutions and for organic matter remineralization. In contrast, organic matter and calcite from the Kupferschiefer do not show regular trends in δ 13C with increasing thermal maturation. Springer-Verlag Berlin Heidelberg, 2000 Aromatics nationallicence Carbon isotopes nationallicence Hydrocarbons nationallicence Kupferschiefer nationallicence Organic geochemistry nationallicence Oxygen isotopes nationallicence Bechtel A. Institut für Geowissenschaften, Prospektion und Angewandte Sedimentologie, Montanuniversität Leoben, Peter-Tunner-Strasse 5, A-8700 Leoben, Austria Tel.: +43-3842-402546 Fax: +43-3842-402640 e-mail: Achim.Bechtl@unileoben.ac.at, AT aut Gratzer R. Institut für Geowissenschaften, Prospektion und Angewandte Sedimentologie, Montanuniversität Leoben, Peter-Tunner-Strasse 5, A-8700 Leoben, Austria Tel.: +43-3842-402546 Fax: +43-3842-402640 e-mail: Achim.Bechtl@unileoben.ac.at, AT aut Püttmann W. Institut für Mineralogie-Umweltanalytik, J.W. Goethe-Universität, Georg-Voigt-Strasse 14, D-60054 Frankfurt a.M., Germany, DE aut Oszczepalski S. Polish Geological Institute, Rakowiecka 4, PL 00-975 Warszawa, Poland, PL aut https://doi.org/10.1007/s005310050318 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s005310050318 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bechtel A. Institut für Geowissenschaften, Prospektion und Angewandte Sedimentologie, Montanuniversität Leoben, Peter-Tunner-Strasse 5, A-8700 Leoben, Austria Tel.: +43-3842-402546 Fax: +43-3842-402640 e-mail: Achim.Bechtl@unileoben.ac.at, AT aut NATIONALLICENCE 700 1- Gratzer R. Institut für Geowissenschaften, Prospektion und Angewandte Sedimentologie, Montanuniversität Leoben, Peter-Tunner-Strasse 5, A-8700 Leoben, Austria Tel.: +43-3842-402546 Fax: +43-3842-402640 e-mail: Achim.Bechtl@unileoben.ac.at, AT aut NATIONALLICENCE 700 1- Püttmann W. Institut für Mineralogie-Umweltanalytik, J.W. Goethe-Universität, Georg-Voigt-Strasse 14, D-60054 Frankfurt a.M., Germany, DE aut NATIONALLICENCE 700 1- Oszczepalski S. Polish Geological Institute, Rakowiecka 4, PL 00-975 Warszawa, Poland, PL aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer