Naslov
Tuff from Nježić locality: 40Ar/39Ar age with integrated biostratigraphy

Autori
Marković, Frane ; Ćorić, Stjepan ; Hernitz-Kučenjak, Morana ; Pezelj, Đurđica ; Kovačić, Marijan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstracts book / Vlahović, Igor ; Matešić, Darko - Zagreb : Hrvatsko geološko društvo, 2023, 314-314

ISBN
978-953-6907-79-3

Skup
36th International Meeting of Sedimentology

Mjesto i datum
Dubrovnik, Hrvatska, 12.06.2023. - 16.06.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Nježić, Badenian, Pannonian Basin, Tuff, 40Ar/39Ar dating

Sažetak
Nježić is located in the eastern part of North Croatian Basin in Slavonia Region near the village of Nježić on the southwestern slopes of Papuk Mt. Within a 140-meter-thick sequence, five lithofacies have been distinguished: metagabbro facies, algal limestone facies, marl facies, bioclastic limestone facies and tuff facies. The metagabbro corresponds to the metagabbro of the Psunj metamorphic complex and represents Pannonian Basin System basement rocks. Algal limestones transgressively overlie the metagabbro, and are present only in the lower part of the sequence as a massive Lithothamnium limestone. About 70% of the deposits in the sequence are composed of marl which is most often massive and rich in microfossil fauna (planktonic and benthic foraminifera), as well as calcareous nanoplankton and fragments of bryozoans and echinoderms. Bioclastic limestones make up 5% of the sequence and appear as layers of centimeter-decimeter thicknesses through the entire sequence. About 25% of the sequence is occupied with the tuff facies. Thickness of the tuff layers ranges from >10 cm to almost 20 m. 40Ar/39Ar dating on the glass fragments from the oldest tuff layer in the sequence yielded a weighted mean age of 14.40 ± 0.03 Ma. All of the nannofossil assemblages, contain zonal marker species Sphenolithus heteromorphus Deflandre 1953 and are therefore attributed into NN5 Zone i.e. the middle part of the Badenian. Planktonic foraminiferal association contains representatives of genera Trilobatus, Praeorbulina, Orbulina, Paraglobototalia and Globigerina. Described planktonic foraminifera association with index species O. suturalis indicated middle Badenian age of sediments (planktonic foraminifera Zone M6). Benthic foraminifera assemblages indicate Lagenidae Zone with index species Uvigerina macrocarinata Papp & Turnovsky. Radioisotope dating result is confirmed by determined calcareous nannoplankton zone NN5 and the M6 Orbulina suturalis zone at the Nježić locality and according to chronostratigraphic similarity, tuff from Nježić locality can be correlated with Harsány ignimbrite in the Bükkalja Volcanic Field eruption unit.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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