Late Cretaceous palaeoenvironmental and tectonostratigraphic reconstructions on the Polish sector of Peri-Tethys

• Autorzy: Kwietniak Anna , Łaba-Biel Anna , Urbaniec Andrzej , Filipowska-Jeziorek Kinga
• Konferencja: Western Tethys meets Eastern Tethys - geodynamical, palaeoceanographical and palaeobiogeographical events : Second Symposium of the International Geoscience Programme IGCP 710 : 28th August - 3rd September, 2023, Kraków, Poland : abstract book
• Języki publikacji: EN

Abstrakty

EN

The study area is located in the central part of the Carpathian Foreland in Poland (Fig. 1), and the analysed interval includes mixed carbonate-clastic sediments of the Upper Cretaceous and the uppermost part of the profile of carbonate sediments of the Upper Jurassic. The sedimentation of the studied formations during the Late Jurassic and Cretaceous took place in the shelf zone of the northern, passive margin of the Tethys Ocean. The western Tethys, unlike its eastern margins, was not a single open ocean; rather, it covered many small plates, Cretaceous island arcs and microcontinents (Palcu & Krijgsman, 2023). The spatial range of the subbasins created between these islands was significantly limited, resulting in a large diversity of palaeoenvironments and the mixed carbonate-clastic sediments of a shallow sea. The entire Upper Jurassic to Cretaceous complex can be viewed as a carbonate platform that lasted almost until the end of the Late Cretaceous with an episode of Early Cretaceous erosion. The sedimentary cover formed at that time initially reached considerable thickness (presumably about 2,000 m). Dislocation and bathymetric differentiation within the carbonate platform initiated the development of a complex depositional environment. During the Late Cretaceous, the syndepositional activity of NW-SE dislocation sequences resulted in an extensive flexural deflection within the Upper Jurassic-Lower Cretaceous sedimentary complex and lowermost part of the Upper Cretaceous complex. The resulting accommodation space was filled with a complex of Upper Cretaceous carbonate formations within which there are intervals with a significant share of siliciclastic material. At the end of the Late Cretaceous as well as in the Paleocene, movements of the Laramie phase led to the re-uplift of the analysed part of the Carpathian Foreland. During this tectonic episode, the reactivation of an older fault system occurred, mainly in the NW-SE directions. The Upper Cretaceous formations deposited in the flexural depression underwent a partial inversion and intensive erosion process, lasting until the beginning of the Neogene, which contributed to the reduction of thicknesses or the removal of some of the Upper Cretaceous formations, especially in the areas, adjacent to the major dislocations. The material for analysis consisted of 3D seismic data and geological information from the wells. In the scope of the project, we approached linking 3D seismic image and well data to reconstruct, as detailed as possible, the palaeoenvironment of the studied segment of the Late Cretaceous basin based on the chronostratigraphic method. The analysis shows various palaeomorphological elements that can bring insight into the sedimentation environments (Fig. 2). The significant influence of tectonic processes on the depositional history of the sedimentary basin was also evidenced. The tectonostratigraphic interpretation divided the Late Cretaceous sediments into two different tectonic phases (Łaba-Biel et al., 2023). Analysis of a thick Miocene interval that overlies directly on the Mesozoic formations enabled to reason about the influence of the Alpine orogenesis on the study area that was manifested by the reactivation of major regional faults in the central part of the Carpathian Foreland. This phase is directly related to the stage of progressive closure of the Tethys Ocean due to the collision of tectonic plates.

Słowa kluczowe

EN

Tethys; paleoenvironment; Late Cretaceous

PL

tetyda; paleośrodowisko; późna kreda

• Wydawca: Wydawnictwa AGH ; Stowarzyszenie Naukowe im. Stanisława Staszica
• Czasopismo: Geotourism / Geoturystyka
• Rocznik: 2023
• Tom: nr 1-2 (72-73)
• Strony: 39--40
• Opis fizyczny: Bibliogr. 3 poz., rys.

Twórcy

autor

Kwietniak Anna

• AGH University of Krakow, Faculty of Geology, Geophysics and Environmental Protection, al. A. Mickiewicza 30, 30-059 Krakow, Poland

autor

Łaba-Biel Anna

• Oil and Gas Institute  – National Research Institute, ul. Lubicz 25A, 31-503 Krakow, Poland

autor

Urbaniec Andrzej

• Oil and Gas Institute  – National Research Institute, ul. Lubicz 25A, 31-503 Krakow, Poland

autor

Filipowska-Jeziorek Kinga

• Oil and Gas Institute  – National Research Institute, ul. Lubicz 25A, 31-503 Krakow, Poland

Bibliografia

• [1] Łaba-Biel A., Kwietniak A., Urbaniec A. & Filipowska-Jeziorek K., 2023. Paleoenvironmental changes in Upper Cretaceous formations in the Polish segment of the Carpathian Foreland. In: 84th EAGE Annual Conference & Exhibition, 1: 1–5. European Association of Geoscientists & Engineers.
• [2] Palcu D.V. & Krijgsman W., 2023. The dire straits of Paratethys: Gateways to the anoxic giant of Eurasia. Geological Society, London, Special Publications, 523(1): 111–139.
• [3] Walaszczyk I., Cieśliński S. & Sylwestrzak H., 1999. Selected geosites of Cretaceous deposits in Central and Eastern Poland. Polish Geological Institute, Special Papers, 2: 71–76.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024)..