caa a22 4500 46789020X CHVBK 20180406152746.0 cr unu---uuuuu 170328e20060101xx s 000 0 eng 10.1007/s00710-005-0107-3 doi (NATIONALLICENCE)springer-10.1007/s00710-005-0107-3 Pb and Sr isotope and geochemical data from the Pb-Zn deposit Bleiberg (Austria): constraints on the age of mineralization [Elektronische Daten] [E. Schroll, V. Köppel, I. Cerny] Summary: The timing of Zn-Pb mineralization hosted by early dolomitized lagoonal limestones (Crest facies) at Bleiberg (Carinthia, Austria) has been constrained using Sr-isotopes. This late stage Zn-Pb mineralization is a special feature of the Bleiberg deposit. Samples of the mineralized Crest facies are characterized by higher concentrations of minor and trace elements (except Ba and Sr) compared to samples from the weakly mineralized Wetterstein limestone of the lagoonal facies. The samples from the Crest facies indicate that a fluid with a minimum 87Sr/86Sr ratio of 0.7083 reacted at 210±30 Ma with carbonate rocks having 87Sr/86Sr ratios of approximately 0.7077 during a late stage of ore formation. The 87Sr/86Sr ratios correlate with the Mn and Cl concentrations. Lead isotope data of whole rock samples of Bleiberg yielded an isochron age of 180±40 Ma. They furthermore confirm the presence of two types of common lead; an isotopically distinct ore lead component is present within and close to the ore bodies. The other common Pb component is present in host rocks and in gangue minerals and is distinguished from the ore lead by lower 207Pb/204Pb and 208Pb/204Pb ratios. The Sr and the Pb ages are consistent with geological evidence indicating a Triassic age of Pb-Zn mineralization and support genetic models emphasizing the role of bacteriogenic sulfate reduction at low temperatures prior to subsidence and burial. Elevated 87Sr/86Sr values (>0.7080) of gangue minerals indicate an epigenetic origin of strontium. Our results are consistent with a genetic model postulating formation of the ore-bearing hydrothermal fluids "at depth” where they leached lead from pre-Upper Carboniferous basement rocks. Springer-Verlag/Wien, 2006 Schroll E. Institute of Mineralogy and Crystallography, University of Vienna, Vienna, Austria aut Köppel V. Institute of Isotope Geology and Mineral Resources, Earth Science Department Swiss Federal Institute of Technology ETH-Zentrum, Zürich, Switzerland aut Cerny I. Bleiberg, Austria aut Mineralogy and Petrology Springer-Verlag 86/1-2(2006-01-01), 129-156 0930-0708 86:1-2<129 2006 86 710 https://doi.org/10.1007/s00710-005-0107-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-005-0107-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schroll E. Institute of Mineralogy and Crystallography, University of Vienna, Vienna, Austria aut NATIONALLICENCE 700 1- Köppel V. Institute of Isotope Geology and Mineral Resources, Earth Science Department Swiss Federal Institute of Technology ETH-Zentrum, Zürich, Switzerland aut NATIONALLICENCE 700 1- Cerny I. Bleiberg, Austria aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer-Verlag 86/1-2(2006-01-01), 129-156 0930-0708 86:1-2<129 2006 86 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer