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Geotectonic setting of Permian polymetallic deposits in the Polish Basin

Karnkowski Paweł Henryk, Poszytek Anna, Delura Katarzyna, Czarnecka-Skwarek Anna, Czuryłowicz Krzysztof

Geological Quarterly

2023

Vol. 67, No. 3

art. no. 34

The Polish Basin is located between the Precambrian East-European Platform and the Cadomian Bohemian and Małopolska massifs. The basement of this Permian-Mesozoic basin comprises mainly Variscides and epi-Caledonian Paleozoic rocks. In the proximal (NE) part of the basin, the Mid-Polish Trough is distinguished. In the distal (SW) part, the thickness of the Permian-Mesozoic succession is much smaller than in the Polish Trough. Palaeorift zones were active from the Permian to the end of the Jurassic in the distal part of this basin. The Kupferschiefer mineral system indicates a palaeorift zone and smaller hot spots as sources of supply of metalliferous brines. The relatively small thickness of the Rotliegend sandstones and their good permeability and porosity properties created very favourable routes for the migration of metal-bearing brines. The entire Kupferschiefer polymetallic reservoir is regionally sealed by anhydrites and salts of the Werra cyclothem. This was inclined constantly from Permian times onwards to the north, favouring the migration of polymetallic brines from rift zones to geochemical reservoir traps. Mineral system analysis of the polymetallic Kupferschiefer deposits shows that the geotectonic setting of this zone relates only to the distal part of the Polish asymmetric rift basin.

Anizotropia akustyczna w utworach wapienia cechsztyńskiego (zachodnia Polska)

Poszytek Anna, Łukaszewski Paweł, Włodarczyk Marcin

Przegląd Geologiczny

2021

Vol. 69, nr 6

386--388

In September2009, gas and rock were ejected from the roof of the excavation at the Rudna copper mine of KGHM Polska Miedź S.A. The ejection occurred as a result of an unsealing of a small gas trap locateda few metres above the roof of the excavation within the dolomites of the first Zechstein cyclothem (PZ1). In order to identify the nature of the reservoir rock for natural gas, microscopic observations and X-ray microtomography were performed and compared with the results of the acoustic anisotropy tests. The obtained results indicate that, based on well-recognized petrological rocks, the results of acoustic anisotropy can be successfully applied as diagnostic for the recognition of rocks of various structures, textures and porosities.