Main commodities: Zn Pb
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The Trzebionka carbonate hosted zinc deposit is located near Chrzanow, 40 km wnw of Crakow in the Upper Silesian district of Poland.

The Zn-Pb mineralisation of the Upper Silesian district is contained within a sequence of Devonian, Triassic and Jurassic carbonates, although the only commercially exploited resources are within Triassic hosts.

The regional setting comprises a Precambrian crystalline basement unconformably overlain by Cambrian, Ordovician, Silurian and Lower Devonian flysch that has been folded and weakly metamorphosed by Caledonian orogenesis. These were overlain by upper Palaeozoic platform carbonates of middle to upper Devonian and Carboniferous age. Both sequences were uplifted and deformed by Variscan movements to form the Cracow-Myszkow elevation which is accompanied by middle to late Palaeozoic magmatism (both intrusive and extrusive) and deep fracture zones. The suceeding Mesozoic carbonate shelf sequence was deposited over both of these earlier and deformed sequences. Two deep, curved fracture zones frame the Upper Silesian ore district which occupies an area of approximately 60 x 60 km.

The Triassic Muschelkalk sequence hosting Zn-Pb sulphides in the district is around 200 m thick and includes limestones, early diagentic dolostones and marls. The immediate hosts are sulphide bearing coarsely crystalline dolomite occurring as extensive, roughly tabular bodies in the Triassic and as very similar, but more irregular, crosscutting and variable Devonian masses. The ore bearing dolomite shows crosscutting, metasomatic contacts with the surrounding un-altered carbonates.

At Trzebionka, the ore deposit consists of a series of ribbon like bodies following the intersection of steep faults and a particular favourable stratigraphic position that has lower grade mineralisation between the faults. The ore can occur in brecciated dolomitem but commonly occurs in ribbon-structures as sulphide-lined voids, generally parallel to bedding surfaces within laminated dolomites, but commonly crosscutting the bedding, to form overall tabular bodies. The cavities of the ribbon ore are filled with drusy sulphide crystals and bordered on both sides by replacement rims which comprise massive aggregates of sphalerite, giving way to outwardly decreasing dispersion aureoles of isolated replacive sphalerite crystals.

The deposit originally contained around 80 Mt @ 3.5 to 4% Zn, 1.5 to 2% Pb, representing an initial resource of 5 Mt of Pb + Zn.

The most recent source geological information used to prepare this summary was dated: 1994.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.

  References & Additional Information
   Selected References:
Mlynarczyk M S J, Barry J P and Large D,  2010 - A reassessment of the mineral exploration potential of the Upper Silesia-Cracow carbonate-hosted zinc-lead district, Poland: in Archibald S M (Ed.), 2010 Proceedings of the Zinc2010 Meeting, Cork 2010, Irish Association for Economic Geology    pp. 19-22
Sass-Gustkiewicz M, Dzulynski S, Ridge J D  1982 - The emplacement of zinc-lead sulfide ores in the Upper Silesian district - a contribution to the understanding of Mississippi Valley-type deposits: in    Econ. Geol.   v77 pp 392-412

Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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