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Późnokredowa tektoniczno-sedymentacyjna ewolucja północnej Polski : opracowanie na podstawie regionalnych danych sejsmicznych

Stachowska Aleksandra, Krzywiec Piotr

Przegląd Geologiczny

2024

Vol. 72, nr 6

270--279

Seismostratigraphic interpretation of the Cretaceous succession of northern Poland was based on regional geo-seismic transects, consisting, mostly, of unique, high-resolution, regional seismic profiles of the Poland SPANTMseismic survey, calibrated by geophysical, stratigraphic and lithological data from several deep boreholes. The upper Albian - Upper Cretaceous succession was divided into 5 seismostratigraphic units. The seismic facies have also been characterized. So far, the interpretation ofthe regional architecture ofthe Upper Cretaceous sedimentary cover of the East European Craton was commonly based on the classic, layer-cake model, assuming simple correlations of stratigraphic units between boreholes. The regional geophysical profiles from the Poland SPANTMsurvey revealed, however, a more complex picture. Within the upper Albian - Upper Cretaceous succession, two major units have been identified that are divided by regional mid-Upper Cretaceous unconformity. Within this succession, numerous clinoforms and erosional incisions have been recognized that are incompatible with the formerly applied layer-cake model. Two systems of contour currents (N-S and NW-SE) were identified as active during the deposition of mostly syn-inversion Upper Cretaceous succession. A new tectono-sedimentary model of the Late Cretaceous evolution of the shelf basin of northern Poland has been proposed that, which tentatively, linked depositional processes with the progressive lithospheric buckling during mid-Late Cretaceous sub-Hercynian tectonic movements.

Fold-and-thrust shortening in the western part of the Upper Silesian Coal Basin

Jura D., Kuzak R.

Polish Geological Institute Special Papers

2002

Vol. 7

133-142

The western frame-margin of the Upper Silesian Coal Basin provides good case studies for structural evolution of the fold-and-thrust belt. This study is concerned with tectonic junctions taking place on the Late Variscan front of the Moravosilesian Fold Zone and coal basin. Clues of evolution of fold-and-thrust belt were reconstructed on the base of six cross-sections and using balancing procedure to calculate the shortening. These structural cross-sections illustrated the two principal positive and negative inversion processes of Upper Silesian Coal Basin. The fold shortening varies in range of 25 up to 30% and in low range of 4 up to 18%. The thrust shortening is contrary to fold shortening and changed range of about 10% up to 50%. In the central part of fold-and-thrust belt summarised shortening is 55%, which gradually decreases northward up to 35% and southward up to 30%.