Unraveling the collisional history of the Western Carpathians through deep geophysical sounding

• Autorzy: Soni Tanishka , Schiffer Chrystian , Mazur Stanisław
• 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 ALpine-CArpathian-PAnnonian (ALCAPA) block is one of the terranes involved in the Alpine-Tethys suture along with the North European Plate. In the Western Carpathians, this suture is supposed to be represented by the Pieniny Klippen Belt (PKB) which is a few kilometres wide and about 600 km long unit between the Outer Western Carpathians (OWC) and Central Western Carpathians (CWC) (Plašienka et al., 1997; Schmid et al., 2008). Unlike the Neotethian suture in the Western Carpathians, the PKB does not show the typical characteristics of a suture. The PKB is a sub-vertical unit with mainly shallow marine limestone and flysch deposits in a conspicuous “blockin-matrix” structure (Plašienka et al., 1997). The presence of “exotic” sediments in the PKB and the southernmost units of the OWC along with their shallow marine deposition environment led to the theory proposing the presence of a continental sliver called the Czorsztyn Ridge in the Alpine Tethys, dividing it into two oceanic/marine basins: the Magura Ocean to the north and the Vahic Ocean to the south (Plašienka, 2018). This controversial continental fragment possibly forming the basement for PKB successions, and its structural relationship with the adjoining OWC and CWC units, make it the main target of this project. The objective is to find evidence of the presence of this continental block, the Czorsztyn Ridge, which may have subducted along with the Vahic oceanic lithosphere underneath the CWC (Schmid et al., 2008). A passive seismic experiment will provide insight into the deep lithospheric structure across the PKP, testing the presence of a tectonic suture along with relaminated remnants of the Czorsztyn Ridge, and potential remnants of subducted or underthrusted lithosphere. Eighteen broadband stations have been deployed in a ~N-S transect (Fig. 1a) under the umbrella of the AdriaArray initiative, cutting across the PKB and Neotethian Meliata suture to the south. The data obtained during up to three years will complement 10 other permanent and temporary broadband stations, forming an approximate 370 km long profile and will be used to perform receiver function analysis and build structural and velocity models of the lithosphere (i.e., Schiffer, 2014; Schiffer et al., 2023) beneath the Western Carpathians. The horizontal extent of the imaging is shown in Figure 1b.

Słowa kluczowe

EN

Carpathians; Tethys; terranes

PL

Karpaty; tetyda; terrany

• Wydawca: Wydawnictwa AGH ; Stowarzyszenie Naukowe im. Stanisława Staszica
• Czasopismo: Geotourism / Geoturystyka
• Rocznik: 2023
• Tom: nr 1-2 (72-73)
• Strony: 65--66
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Soni Tanishka

• Polish Academy of Sciences, Institute of Geological Sciences, Krakow, Poland

autor

Schiffer Chrystian

• Department of Earth Sciences, Uppsala University, 752 36 Uppsala, Sweden

autor

Mazur Stanisław

• Polish Academy of Sciences, Institute of Geological Sciences, Krakow, Poland

Bibliografia

• [1] Plašienka D., 2018. Continuity and episodicity in the early Alpine tectonic evolution of the Western Carpathians: How large‐scale processes are expressed by the orogenic architecture and rock record data. Tectonics, 37(7): 2029–2079. https://doi.org/10.1029/2017TC004779.
• [2] Plašienka D., Grecula P., Putiš M., Kováč M. & Hovorka D., 1997. Evolution and structure of the Western Carpathians: an overview. In: P. Grecula, D. Hovorka, M. Putiš (eds), Geological evolution of the Western Carpathians, Mineralia Slovaca Corporation-Geocomlpex  – Geological Survey of Slovak Republic, Bratislava: 1–24.
• [3] Schiffer C., Balling N., Jacobsen B.H., Stephenson R.A. & Nielsen S.B., 2014. Seismological evidence for a fossil subduction zone in the East Greenland Caledonides. Geology, 42(4): 311–314. https://doi.org/10.1130/G35244.1.
• [4] Schiffer C., Rondenay S., Ottemöller L. & Drottning A., 2023. The Moho architecture and its role for isostasy–insights from the Lofoten‐Vesterålen rifted margin, Norway. Journal of Geophysical Research: Solid Earth, 128(5): e2022JB025983. https://doi.org/10.1029/2022JB025983.
• [5] Schmid S., Bernoulli D., Fügenschuh, B., Matenco L., Schefer S., Schuster R., Tischler M. & Ustaszewski K., 2008. The Alpine-Carpathian-Dinaridic orogenic system: Correlation and evolution of tectonic units. Swiss Journal of Geosciences, 101: 139–183. https://doi.org/10.1007/s00015-008-1247-3.

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).