Abstract
The Freiberg mining district in the Erzgebirge hosts three principal types of polymetallic veins. These are (1) the quartz-bearing polymetallic sulfide type, (2) the carbonate-bearing polymetallic sulfide type, and (3) the barite-fluorite-sulfide type. We investigated the genesis of each vein-type using Rb-Sr sphalerite geochronology, Sm-Nd fluorite geochronology, and Pb, Sr, and Nd isotope systematics of ore and gangue minerals. Field relationships and the Rb-Sr and Pb isotope systematics of sulfides from quartz-bearing polymetallic sulfide veins and carbonate-bearing polymetallic sulfide veins confirm their close genetic affiliation and yield a combined Rb-Sr errorchron age of 276 ± 16 Ma. The high mean squared weighted deviation (MSWD) value of 42 on the regression is considered to reflect initial isotopic heterogeneity, which is probably related to fluid-rock interaction during the hydrothermal mineralization process. Although some sphalerites from barite-fluorite-sulfide veins have strongly disturbed Rb-Sr isotope systematics, six sphalerites and one co-genetic fahlore yield a robust isochron age of 121.3 ± 4.2 Ma with an MSWD of 2.9. This age is supported by a fluorite Sm-Nd isochron age of 101 ± 18 Ma (MSWD = 1.3). The new ages and radiogenic isotope data place robust constraints on the long-held hypothesis that veins in the Freiberg district formed during two hydrothermal events. The Lower Permian age of first stage quartz-bearing polymetallic sulfide veins and carbonate-bearing polymetallic sulfide veins coincides with post-Variscan crustal reorganization and Rotliegend volcanism. The Mid-Cretaceous age of second stage barite-fluorite-sulfide veins coincides with opening of the North Atlantic Ocean during the break-up of Pangea.
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Acknowledgements
Isotope and trace element analyses were conducted at the Federal Institute for Geosciences and Natural Resources (BGR) in Hannover (Germany). Siegrid Gerlach and Monika Bockrath are warmly thanked for their help and advice during the senior author’s stay in Hannover. Further thanks are due to Hans Lorenz (BGR) for performing ICP-MS measurements. Help of Sabine Gilbricht (TU Bergakademie Freiberg - TUBAF) with MLA measurements is highly acknowledged. We greatly appreciate the comments of Jens Schneider (TUBAF) on an earlier version of the manuscript. Christin Kehrer is acknowledged for providing sample material from the ore deposit collection of the TUBAF. Matthias Bauer (TUBAF) provided a draft for the geological map of the Freiberg district (Fig. 2). Andreas Bartzsch and Roland Würkert (Helmholtz Institute Freiberg for Resource Technology) as well as Michael Magnus and team (TUBAF) are thanked for preparation of polished sections. We thank editor Bernd Lehmann, guest editor Gregor Markl, and two anonymous reviewers for their comments that helped to improve this paper.
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Ostendorf, J., Henjes-Kunst, F., Seifert, T. et al. Age and genesis of polymetallic veins in the Freiberg district, Erzgebirge, Germany: constraints from radiogenic isotopes. Miner Deposita 54, 217–236 (2019). https://doi.org/10.1007/s00126-018-0841-1
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DOI: https://doi.org/10.1007/s00126-018-0841-1