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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.

Depositional architecture of the Upper Cretaceous succession in central Poland (Grudziądz-Polik area) based on regional seismic data

Stachowska Aleksandra, Krzywiec Piotr

Geological Quarterly

2021

Vol. 65, No. 2

art. no. 21

Interpretation of the regional high-resolution seismic data of the PolandSPANTM survey in the Grudziądz-Polik area revealed a new depositional architecture of the Upper Cretaceous succession that differs substantially from the previously assumed layer-cake model, commonly applied to Permian-Mesozoic sequences. A previously unrecognized regional unconformity, dividing the Upper Cretaceous succession into two units characterized by very different internal geometries, was identified and mapped. The lower unit, with a generally layer-cake internal pattern, is overlain by an upper unit composed of a regionally low-angle succession that pinches out toward the south. This newly revealed regional pattern remained unrecognized in previous regional compilations based on borehole data, which suggested that a layer-cake depositional architecture prevailed throughout the entire Upper Cretaceous. This new image of Upper Cretaceous depositional patterns has far-reaching consequences for understanding of the evolution of the Polish Basin in the Late Cretaceous, including its subsidence and burial history, deposition, and tectonic development. A re-evaluation of the chronostratigraphy of the Upper Cretaceous of the Polish Basin is needed to temporally constrain the succession of sedimentary and tectonic events revealed here.