Middle Aptian Orbitolinid limestones in Belgrade (Serbia): microfacies and depositional environment

Lower Cretaceous (Aptian) shallow-marine limestones with intercalated polymictic conglomerates were investigated with respect to their biostratigraphic age and their microfacies. They are the younger part of the generally carbonate-siliciclastic Lower Cretaceous deep-water (max. few hundred metres)...

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Bibliographic Details
Published in:Geologia Croatica 2023-01, Vol.76 (3), p.147-156
Main Authors: Đorđević, Bojana, Gawlick, Hans-Jürgen, Djerić, Nevenka, Schlagintweit, Felix, Radonjić, Miloš
Format: Article
Language:English
Subjects:
Age
Basins
Carbonates
Conglomerates
Cretaceous
Deep water
Dinarides
Early Cretaceous
Foraminifera
Fossils
Fruits
Jurassic
Limestone
Melanges
Microfacies
Microorganisms
Ophiolites
Orbitolinidae
Radiolarite
Triassic
Turbidites
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Summary:Lower Cretaceous (Aptian) shallow-marine limestones with intercalated polymictic conglomerates were investigated with respect to their biostratigraphic age and their microfacies. They are the younger part of the generally carbonate-siliciclastic Lower Cretaceous deep-water (max. few hundred metres) turbiditic sequences (“Paraflysch”) of the so-called East Vardar zone in the Belgrade area. The biostratigraphic age of the limestones was determined by orbitolinid foraminifera: the co-occurrence of Dictyoconus? pachymarginalis SCHROEDER and Mesorbitolina texana (ROEMER) besides various other microfossils suggest a biostratigraphic age of this shallow- marine limestone succession as middle Aptian (Gargasian). Radiolarite components in the conglomerates are Triassic in age and were derived from the obducted Middle Triassic to Middle Jurassic Neo-Tethys ophiolites and/or their ophiolitic mélanges on the wider Adria plate. From both the first precise biostratigraphic age dating as middle Aptian combined with microfacies analysis of these shallow-marine limestones and the component spectrum in the intercalated conglomerates, it can be concluded that the Lower Cretaceous turbiditic “Paraflysch” succession was deposited on the eastern rim of the Dinarides. The results will allow a better comparison of the different Lower Cretaceous sedimentary successions deposited on the eastern margin of the Dinarides.
ISSN:1330-030X
1333-4875
DOI:10.4154/GC.2023.09