Results of the project - sedimentology of the upper part of the Petřkovice Member, Upper Silesian Basin

 

Petr Bezuško, Stanislav Opluštil, Alexandr Martaus, David Uličný

Geoscience Research Reports 38, 2005 (GRR for 2004), pages 12–15

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Abstract

A sedimentological-stratigraphic study of the upper part of the Petřkovice member (Carboniferous - Namurian A) was performed in the Czech part of the Upper Silesian Basin (in the area bounded approximately by the line Rožnov pod Radhoštěm-Třinec-Ostrava-Nový Jičín). These sediments are part of the coal-bearing foreland basin's fill. The aim of the project was the understanding of processes which governed the sedimentation, with a special respect to the rhythmic sediments typical for this stratigraphic interval. In ideal development the Petřkovice member reach the thick- ness of approx. 560 m. Within this thickness, up to 30 various independent layers of rhythmic sediments and at least the same number of laminated horizons without obvious rhythmic character were identified. As a most consistent there are the horizons underlying the coal seam 11c, the capping coal seam 12 (so-called banded claystone horizon) and underlying the coal seam 22c. In order to determine the aerial extent of individual horizons of rhythmic sediments and interpret the sedimentation environment during their formation a total of 20 cross sections of the upper part of the Petřkovice member were constructed within the area of the Czech part of the Upper Silesian Basin, 9 in NE-SW direction and 11 in N-W to NW-SE direction.