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Marine carbonate systems in the Sarmatian (Middle Miocene) of the Central Paratethys: the Zsámbék Basin of Hungary |
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| Authors: | JEAN-JACQUES CORNÉE PIERRE MOISSETTE† JEAN-PAUL SAINT MARTIN‡ MIKLÓS KÁZMÉR§ EM&#;KE TÓTH§ ÁGNES GÖRÖG§ ALFRÉD DULAI¶ PÁL MÜLLER |
| Institution: | UMR 5243 CNRS, Géosciences Montpellier, UniversitéMontpellier II, CC 60, pl. Eugène Bataillon, 34095 Montpellier Cedex 05, France (E-mail: ); UMR 5125 PEPS CNRS, UniversitéLyon I, Campus de la Doua, 69622 Villeurbanne Cedex, France; UMR 5143 CNRS, Département Histoire de la Terre, Muséum National d'Histoire Naturelle, 8 rue Buffon, 75005 Paris, France; Department of Palaeontology, Eötvös University, H-1518 Budapest, P.O. Box 120, Hungary; Department of Geology and Palaeontology, Hungarian Natural History Museum, H-1431 Budapest, P.O. Box 137, Hungary; Hungarian Geological Institute, H-1143 Budapest, Stefánia út 14, Hungary Associate Editor: Dave Mallinson |
| Abstract: | The study of eight stratigraphic sections at the margin of the semi-enclosed Zsámbék Basin (Hungary) allows the sedimentary anatomy of oolitic–bioclastic systems in the Sarmatian of the Central Paratethys to be reconstructed. The mollusc, foraminiferal and ostracod associations indicate that the carbonate systems are Latest Badenian to Late Sarmatian in age. The Lower–Upper Sarmatian deposits are organized in superimposed subaqueous dunes prograding towards the basin on a low-angle ramp. During the Late Sarmatian, the ramp underwent subaerial erosion linked to a moderate relative fall in sea-level. Lagoonal deposits were later formed and microbial–nubeculariid–bryozoan–serpulid buildups were emplaced. The 'abnormal' marine conditions of the Sarmatian, conducive to the development of a poorly diversified flora and fauna and dominant non-skeletal grains, are linked to fluctuating salinities, mesotrophic to eutrophic conditions and perhaps high alkalinity. |
| Keywords: | Buildups carbonates Hungary Miocene oolites Paratethys |