40Ar/39Ar geochronology of Burdigalian paleobotanical localities in the central Paratethys (south Slovakia)

Authors

  • Katarína Šarinová Faculty of Natural Sciences, Comenius University in Bratislava https://orcid.org/0000-0003-1792-5862
  • Samuel Rybár Faculty of Natural Sciences, Comenius University in Bratislava https://orcid.org/0000-0003-4548-9340
  • Fred Jourdan Western Australian Argon Isotope Facility and John de Laeter Centre, Curtin University, Perth, Western Australia 6845, Australia. School of Earth and Planetary, SSTC and TIGeR, Curtin University, Perth, Western Australia 6845, Australia.
  • Adam Frew School of Earth and Planetary, SSTC and TIGeR, Curtin University, Perth, Western Australia 6845, Australia.
  • Celia Mayers School of Earth and Planetary, SSTC and TIGeR, Curtin University, Perth, Western Australia 6845, Australia.
  • Marianna Kováčová Faculty of Natural Sciences, Comenius University in Bratislava
  • Barbara Lichtman Faculty of Natural Sciences, Comenius University in Bratislava
  • Petronela Nováková Faculty of Natural Sciences, Comenius University in Bratislava
  • Michal Kováč Faculty of Natural Sciences, Comenius University in Bratislava

DOI:

https://doi.org/10.1344/GeologicaActa2021.19.5

Keywords:

Ottnangian, Gyulakeszi Rhyolite Tuff Formation, 40Ar/39Ar dating, petrography, sedimentology

Abstract

The Lipovany and Mučín paleobotanical localities contain important floral associations within the tuff horizons, which were used for determination of subtropical to tropical climatic conditions during the Early Miocene. Based on the combination of results from plagioclase and biotite 40Ar/39Ar dating, the age of the tuff deposition is around 17.3Ma. For the Lipovany locality, single-grain 40Ar/39Ar convergent ages of 17.49±0.54Ma and 17.28±0.06Ma, for plagioclase and biotite were obtained, respectively. The Mučín locality only provide an imprecise convergent age of 16.5±1.4Ma due to the small size of the analyzed plagioclase crystals. The results thus allowed to include the fossil subtropical flora of the studied localities in the late Ottnangian regional stage (upper part of the Burdigalian). Additionally, these age data indicate that deposition of the overlaying Salgótarján Formation starts much later than originally thought (during Ottnangian-Karpatian boundary).

Author Biographies

Katarína Šarinová, Faculty of Natural Sciences, Comenius University in Bratislava

Department of mineralogy and petrology

Samuel Rybár, Faculty of Natural Sciences, Comenius University in Bratislava

Department of geology and paleontology

Marianna Kováčová, Faculty of Natural Sciences, Comenius University in Bratislava

Department of geology and paleontology

Barbara Lichtman, Faculty of Natural Sciences, Comenius University in Bratislava

Department of mineralogy and petrology

Petronela Nováková, Faculty of Natural Sciences, Comenius University in Bratislava

Department of geology and paleontology

Michal Kováč, Faculty of Natural Sciences, Comenius University in Bratislava

Department of geology and paleontology

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