Physical and biological properties of the late Miocene, long-lived Turiec Basin, Western Carpathians (Slovakia) and its paleobiotopes |
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| Authors: | Radovan Pipík Anne-Marie Bodergat Danielle Briot Michal Ková? Ján Král’ Grzegorz Zielinski |
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| Institution: | (1) Geological Institute, Slovak Academy of Sciences, Ďumbierska 1, 974 01 Bansk? Bystrica, Slovak Republic;(2) UMR 5125 PEPS CNRS, Villeurbanne Cedex, France;(3) Universit? Lyon 1, Laboratoire de G?ologie de Lyon Terre, Plan?tes, Environnement, CNRS UMR 5276, Campus La Doua, 69622 Villeurbanne, France;(4) Universit? Blaise Pascal Clermont-Ferrand II, UMR 6524 “Laboratoire Magmas et Volcans”, 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France;(5) Department of Geology and Paleontology, Comenius University, 84215 Bratislava, Slovak Republic;(6) State Geological Institute of Dion?z Št?r, Mlynsk? dolina 1, 81704 Bratislava, Slovak Republic;(7) Institute of Geological Sciences, Polish Academy of Sciences, ul. Twarda 51/55, 00-818 Warszawa, Poland |
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| Abstract: | The Turiec Basin (TB) of Slovakia formed in the Miocene when the West Carpathians escaped from the Alpine region. The 1,250-m-thick
sedimentary Neogene fill of the basin preserved fossil leaves as well as endemic bivalves, gastropods, and ostracodes. The
paleolimnologic changes recorded in the TB infill were derived from the most abundant fossils, the ostracodes. Five contemporaneous
ostracode assemblages within the Late Miocene lacustrine system were distinguished through statistical analysis. These assemblages
have low species similarity, between 2.1 and 24.1%, and are recognized by shape differences among the Candoninae. The ostracode
assemblages, mollusca fossils, and Sr-isotope ratios suggest a low-salinity environment at the beginning of the Late Miocene,
during a brief connection with the Central Paratethys. When the connection ceased, the basin became an isolated freshwater
lake, with five zones differentiated ecologically and bathymetrically using the ostracode assemblages. Taxonomic comparison
of the faunas of the TB and the freshwater to brackish Neogene basins of Europe demonstrates the endemic character of the
TB ostracode fauna. The biologic characteristics of the ostracode families, along with the geology of the lake basin, suggest
that the longevity of the Late Miocene lake probably exceeded 1 Ma. |
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