The Jurassic–Cretaceous transition in the High-Tatric succession (Giewont Unit, Western Tatra Mts, Poland): integrated stratigraphy and microfacies

Authors

  • Damian Gerard Lodowski Faculty of Geology, University of Warsaw, Żwirki i Wigury 93, 02-089 Warsaw
  • Andrzej Pszczółkowski Institute of Geological Sciences, Polish Academy of Sciences, Warszawa Research Centre, ul. Twarda 51/55, 00-818 Warsaw
  • Andrzej Wilamowski Polish Geological Institute-National Research Institute, ul. Rakowiecka 4, 00-975 Warsaw
  • Jacek Grabowski Polish Geological Institute-National Research Institute, ul. Rakowiecka 4, 00-975 Warsaw

Keywords:

Microfossils, Rock magnetism, Carbon isotopes, Western Carpathians, Tatra Mountains

Abstract

Herein are presented the results of detailed bio- (calcareous dinocysts, calpionellids, foraminifers, saccocomids) and chemostratigraphic (δ13C) studies combined with high-resolution microfacies, rock magnetic and gamma-ray spectrometry (GRS) investigations performed on the upper Kimmeridgian–upper Valanginian carbonates of the Giewont succession (Tatricum, Giewont and Mały Giewont sections, Western Tatra Mountains, Poland). The interval studied covers the contact between the Raptawicka Turnia Limestone (RTL) Fm. and the Wysoka Turnia Limestone (WTL) Fm. Their sedimentary sequence is composed of micrites, pseudonodular limestones, cyanoid packstones, lithoclastic packstone and encrinites. A precise correlation with the previously published Mały Giewont section is ensured by biostratigraphy, rock magnetic and GRS logs. The methodology adopted has enabled the recognition of two stratigraphic discontinuities, approximated here as corresponding to the latest Tithonian–early (late?) Berriasian and the early Valanginian. The hiatuses are evidenced by biostratigraphic data and the microfacies succession as well as by perturbations in isotopic compositions and rock magnetic logs; they are thought to result from a conjunction of tectonic activity and eustatic changes. A modified lithostratigraphic scheme for the Giewont and the Osobita High-Tatric successions is proposed. The top of the RTL Fm. falls in the upper Tithonian, where cyanoid packstones disappear. At the base of the WTL Fm. a new Giewont Member is defined as consisting of a basal lithoclastic packstone and following encrinites.

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Published

2022-03-07

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Articles