Biostratigraphy and microfacies of the pelagic carbonates across the Jurassic/Cretaceous boundary in eastern Serbia (Stara Planina–Poreč Zone)

Pages: 
pp. 53-76
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 24, 1113 Sofia, Bulgaria
Department of Geology, Faculty of Mining and Geology, University of Belgrade, Kamenicka 6, P.O. Box 227, 11000 Belgrade, Serbia
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 24, 1113 Sofia, Bulgaria
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 24, 1113 Sofia, Bulgaria
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 24, 1113 Sofia, Bulgaria
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 24, 1113 Sofia, Bulgaria
Department of Geology, Faculty of Mining and Geology, University of Belgrade, Kamenicka 6, P.O. Box 227, 11000 Belgrade, Serbia
Abstract: 

Integrated micropaleontological and microfacies studies on Tithonian and Berriasian pelagic carbonates of the Stara Planina–Poreč Zone (eastern Serbia) provided a new knowledge on the stratigraphic ages, depositional settings and lateral correlation with the Western Balkan Unit in Bulgaria. A total of forty calpionellid species, nineteen benthic foraminiferal species, and fourteen species of calcareous dinoflagellates have been identified in the Rosomač section in eastern Serbia. Calpionellid zones Chitinoidella, Crassicollaria, Calpionella, and Calpionellopsis have been recorded. Calcareous dinoflagellate zonation consists of Parastomiosphaera malmica, Colomisphaera fortis, and Stomiosphaerina proxima zones. The Rosomač Limestones are assigned to the Upper Tithonian and Lower Berriasian and the Ržana Clayey Limestone Beds to the Upper Berriasian. Seven distinct microfacies have been identified at the Rosomač section in eastern Serbia. Two of them, MF 1 calpionellid mudstones and MF 2 calpionellid wackestones, characterize the basinal depositional zone. Five microfacies belong to the slope facial zone, including the toe of the slope. These are: MF 3 Saccocoma wackestones, MF 4 wackestones with bioclasts, MF 5 intraclast-bioclastic grainstones, MF 6 bioclast-intraclastic floatstones, and MF 7 bioclast-intraclastic rudstones. Vertical microfacies distributions are directly correlated with the calpionellid and calcareous dinocyst zonations in sections in Serbia and Bulgaria. The pelagic carbonates in the Tithonian/Berriasian boundary interval were deposited under slope
conditions at Rosomač section, and under basinal conditions at Barlya section in western Bulgaria.

Keywords: 

Tithonian, Berriasian, eastern Serbia, calpionellids, calcareous dinoflagellates, microfacies, depositional setting

VOLUME 41 (1-3)/December 2012

Faculty of Science, Department of Geology, Ferdowsi University of Mashhad, Mashhad, Iran
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Faculty of Science, Department of Geology, Ferdowsi University of Mashhad, Mashhad, Iran
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Department of Geology, Faculty of Science, University of Shahid Beheshti, Tehran, Iran
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Departamento de Ciencias de la Tierra (Paleontología) e Instituto de Investigación en Ciencias Ambientales (IUCA), Universidad de Zaragoza, C/ Pedro Cerbuna 12, E-50009 Zaragoza, Spain
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Department of Geology, Paleontology and Fossil Fuels, Faculty of Geology and Geography, Sofia University “St. Kliment Ohridski”, Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bl. 24, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 24, 1113 Sofia, Bulgaria
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Department of Geology, Faculty of Mining and Geology, University of Belgrade, Kamenicka 6, P.O. Box 227, 11000 Belgrade, Serbia
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Bl. 24, 1113 Sofia, Bulgaria
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Department of Geology, Faculty of Mining and Geology, University of Belgrade, Kamenicka 6, P.O. Box 227, 11000 Belgrade, Serbia

USM 203 du Muséum national d’Histoire naturelle et UMR 7207 du CNRS, 17 rue du Docteur Magnan, 75013 Paris, France
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Department of Geology and Paleontology, University of Mining and Geology “St. Ivan Rilski”, 1700 Sofia, Bulgaria

Faculty of Geology and Geoenvironment, Department of Geography-Climatology, University of Athens, Panepistimioupolis, 15784, Athens, Greece