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

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.

Nearshore Pelagic Influence at the SW Margin of the Paratethys Sea—Examples from the Miocene of Croatia

“…Based on the stratigraphic span of the planktonic and benthic biota, Middle Miocene biostratigraphy can be correlated with other relevant data (Figures 4 and 17). [4,13,51,132,133,[148][149][150][151][152]). Vejalnica Formation is described on the basis of the Čučerje Realm sequence (with previously described basinal deposits); while Dolje Formation can be compared with the younger part of the formerly described Dolje Realm succession.…”

“…Vejalnica Formation is described on the basis of the Čučerje Realm sequence (with previously described basinal deposits); while Dolje Formation can be compared with the younger part of the formerly described Dolje Realm succession. [4,13,51,132,133,[148][149][150][151][152]). Vejalnica Formation is described on the basis of the Čučerje Realm sequence (with previously described basinal deposits); while Dolje Formation can be compared with the younger part of the formerly described Dolje Realm succession.…”

Middle Miocene volcanic flare up preceding and synchronous with the Langhian/Serravallian sea‐level decline in the North Pannonian Basin: Insights from 40Ar/39Ar dating, geo‐seismic analysis and 3D visualization of the subterranean Kráľová stratovolcano

“…In present time, thanks to this development, many workers in CPR are devoted to inquiry about radioisotope age data from altered pyroclastic rocks; to the age refinement of volcanic stages; as well as to the correlation of products of volcanic activity in time and space (e.g. Badurina et al., 2021; Bojar et al., 2018; Brlek et al., 2020, 2023; Bukowski et al., 2018; de Leeuw et al., 2010, 2018; Karátson et al., 2000, 2007; Lukács et al., 2015, 2018, 2021; Marković et al., 2021; Pálfy et al., 2007; Roetzel et al., 2014; Rybár et al., 2019; Sant et al., 2019, 2020; Šarinová, Hudáčková, et al., 2021; Šarinová, Rybár, et al., 2021; Šegvić et al., 2023; Śliwiński et al., 2012; Wijbrans et al., 2007). These data allow to improve the statement about genetic evolution and also estimates of the extent and strength of eruptions (e.g.…”