Original scientific paper

https://doi.org/10.4154/gc.2021.18

Middle Miocene marine flooding: new 40Ar/39Ar age constraints with integrated biostratigraphy on tuffs from the North Croatian Basin

Frane Marković ; University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 102b, 10 000 Zagreb, Croatia
Klaudia Kuiper ; Faculty of Sciences, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
Stjepan Ćorić ; Geological Survey of Austria, 1030 Vienna, Austria
Valentina Hajek-Tadesse orcid.org/0000-0002-3396-7897 ; Croatian Geological Survey, Sachsova 2, 10 000 Zagreb, Croatia
Morana Hernitz Kučenjak orcid.org/0000-0001-5970-1467 ; INA – Industrija nafte, d.d., Rock & Fluid Analysis, Lovinčićeva 4, 10 000 Zagreb, Croatia
Koraljka Bakrač orcid.org/0000-0002-2520-411X ; Croatian Geological Survey, Sachsova 2, 10 000 Zagreb, Croatia
Đurđica Pezelj ; University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 102b, 10 000 Zagreb, Croatia
Marijan Kovačić ; University of Zagreb, Faculty of Science, Department of Geology, Horvatovac 102b, 10 000 Zagreb, Croatia

Supplements: 1063-Research Results-13044-2-10-20211027.pdf 1063-Research Results-13045-2-10-20211027.pdf

Abstract

In the North Croatian Basin which is located in the southwestern part of the Pannonian Basin System, Miocene tuff deposits have been observed at several localities in the area of Banovina, Medvednica Mt. and Slavonia. Here we present new 40Ar/39Ar age results obtained from volcanic glass from the Laz tuff (15.42 ± 0.15 Ma) intercalated with lacustrine freshwater/brackish deposits, the Jovac tuff (15.10 ± 0.06 Ma) intercalated with lacustrine freshwater deposits, the Čučerje tuff (14.81 ± 0.08 Ma) and the Nježić tuff (14.40 ± 0.03 Ma) both deposited in a marine environment. Fossil data (calcareous nannofossils/foraminifera) from the underlying and overlying beds of the tuffs from Čučerje and Nježić match the geochronological data i.e. NN5 zone and M6 zone were determined. Integration of biostratigraphic and geochronological data enable a better understanding of the NCB sedimentary evolution and constrain the Middle Miocene marine flooding event in the marginal areas of the western part of the NCB at ~15 Ma i.e. early/middle Badenian boundary. These results together with the existence of lower Badenian marine sediments in the Sava depression (in the southern part of NCB) suggest it is possible to conclude that during the early Badenian in the NCB, freshwater lacustrine and marine  environments coexisted. 

Keywords

40Ar/39Ar chronology; tuff; Miocene; North Croatian Basin; Central Paratethys

Hrčak ID:

265326

URI

https://hrcak.srce.hr/265326

Publication date:

27.10.2021.

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