Evidence for low-temperature alteration of sulfides in the Kupferschiefer copper deposits of southwestern Poland

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doi: 10.2113/gsecongeo.90.8.2143
Authors:Large, D. J.; MacQuaker, J.; Vaughan, D. J.; Sawlowicz, Z.; Gize, A. P.
Author Affiliations:Primary:
University of Manchester, Department of Earth Sciences, Manchester, United Kingdom
Jagellonian University, Institute of Geological Sciences, Cracow, Poland
Volume Title:Economic Geology and the Bulletin of the Society of Economic Geologists
Source:Economic Geology and the Bulletin of the Society of Economic Geologists, 90(8), p.2143-2155. Publisher: Economic Geology Publishing Company, Lancaster, PA, United States. ISSN: 0361-0128
Publication Date:1995
Note:In English. 31 refs.; illus., incl. 2 tables, strat. cols., sketch map
Summary:Minerals of the Cu-Fe-S system from the Lubin and Rudna mines in the Polish Kupferschiefer display textures and compositional trends consistent with copper depletion. The compositions, optical properties, textures, and distribution of Cu-S minerals indicate progressive alteration from chalcocite to covellite in the sequence chalcocite-djurleite-anilite-geerite-spionkopite-yarrowite-covellite. Bornite compositions plot on the Cu-Fe-S phase diagram along a line between ideal bornite (Cu5FeS4) and Idaite (Cu3FeS4). The range in bornite compositions extends from ideal bornite to Cu3.5FeS4. Copper-poor bornites within the composition range Cu4.5FeS4 to Cu3.5FeS4 texturally appear to have partially decomposed to covellite and chalcopyrite. Both of these mineralogical trends have been previously reported from zones of supergene alteration in other copper deposits, where they result from copper leaching. Grains observed to be of uniform anilite composition indicate that the alteration occurred at low temperatures, probably less than 40°C. In the Lubin mine samples, the most copper-depleted minerals, yarrowite, covellite, copper-poor bornite, and chalcopyrite occur in association with veins of gypsum, anhydrite, and atacamite. This association probably results from the interaction of saline mine waters with the sulfides. In the Rudna mine samples, copper leaching is confined to distinct impermeable horizons, most notably at the top of the Weissliegendes and in the Kupferschiefer at the contact between the Cu and Pb zones. On both horizons, the mineralogical change passing upward corresponds to increasing copper depletion. Considering the impermeability of the horizons and the low temperature of anilite formation, the horizon-specific copper depletion probably occurred during early diagenesis...
Subjects:Alteration; Chemical composition; Composition; Copper ores; Copper sulfides; Diagenesis; Early diagenesis; Electron probe data; Faults; Kupferschiefer; Low temperature; Metal ores; Mineral composition; Mineral deposits, genesis; Optical properties; Paleozoic; Permian; Petrography; Spatial distribution; Sulfides; Supergene processes; Temperature; Textures; Thin sections; Upper Permian; Veins; Zechstein; Zoning; Central Europe; Dolnoslaskie Poland; Europe; Legnica-Glogow mining district; Poland; Lubin mining district; Lugin mining district; Rudna Mine; Southwestern Poland; Weissliegendes
Coordinates:N510000 N514500 E0170000 E0160000
Abstract Numbers:96M/4011
Record ID:1996027842
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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