An Oligocene olistostrome with exotic clasts in the Silesian Nappe (Outer Ukrainian Carpathians, Uzh River Basin)

Authors

  • Oleh Hnylko Institute of Geology and Geochemistry of Combustible Minerals of NAS of Ukraine, Naukova Street, 3a, Lviv, 79060, Ukraine http://orcid.org/0000-0001-5983-952X
  • Svitlana Hnylko Institute of Geology and Geochemistry of Combustible Minerals of NAS of Ukraine, Naukova Street, 3a, Lviv, 79060, Ukraine
  • Larysa Heneralova Ivan Franko National University of Lviv, Faculty of Geology, Mykhaila Hryshevskoho Street, 4, Lviv, 79005, Ukraine
  • Maria Tsar Institute of Geology and Geochemistry of Combustible Minerals of NAS of Ukraine, Naukova Street, 3a, Lviv, 79060, Ukraine

Keywords:

Ukrainian Carpathians, Silesian Nappe, Oligocene, olistostrome, foraminifers, biostratigraphy, palaeogeography

Abstract

In the Ukrainian part of the Silesian Nappe (Outer Carpathians, Uzh River Basin) the exotic clast-bearing Uzhok Olistostrome (up to 60 m thick) occurs within the Oligocene Krosno Formation and underlies the Pikui Sandstone (Otryt Sandstone in Poland). The Uzhok Olistostrome consists of debris/grain/mud flow deposits with clasts of schist and bioclastic limestone. These deposits contain redeposited pelagic sediments with planktonic foraminifers including Parogloborotalia pseudocontinuosa (Jenkins), Ciperoella ciperoensis (Bolli), Globoturborotalita woodi (Jenkins), Chiloguembelina adriatica Premec Fucek, Hernitz Kucenjak and Huber. The age of the Uzhok Olistostrome based on planktonic foraminifers correlates with the middle Oligocene within the middle O2–O5 zones. The source area for the Uzhok Olistostrome and Pikui Sandstone was a mid-Oligocene intrabasinal palaeouplift (the Pikui Ridge) interpreted as the fore-bulge located in the Silesian Sub-basin ahead the emerging Outer Carpathian accretionary prism (including the Dukla Nappe and other West Carpathian inner flysch nappes). 

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Published

2021-12-31

Issue

Vol. 65 No. 4 (2021)

Section

Articles

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