Naslov
Late Miocene (Pannonian) dinoflagellate biostratigraphy of the Danube Basin (western Slovakia) and palaeoenvironmental evolution of the north western realm of Lake Pannon based on palynological data
(Late Miocene (Pannonian) dinoflagellate biostratigraphy of the Danube Basin (western Slovakia) and palaeoenvironmental evolution of the nort western realm of Lake Pannon based on palynological data)

Autori
Baranyi, Viktoria ; Kováčová, Marianna ; Kovac, Michal ; Magyar, Imre ; Görög, Ágnes

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

Izvornik
Abstract Book / - , 2014, 10-11

Skup
9th European Palaeobotany-Palynology Conference

Mjesto i datum
Padova, Italija, 26.08.2014. - 31.08.2014

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Lake Pannon, dinoflagellate cyst zonation, Danube Basin, Late Miocene

Sažetak
During the Late Miocene a wide brackish lake, Lake Pannon formed in the Alpine-Carpathian-Dinaric realm covering the territory of the Pannonian Basin system. After its isolation from adjacent Paratethyan and Mediterranean areas during the Sarmatian, marine microplankton became extinct and new endemic forms originated. These endemic dinoflagellate cysts play a crucial role in the biostratigraphic subdivision of Pannonian deposits. We present the preliminary data on the Pannonian, (late Miocene) dinocyst zonation for the Danube Basin (Slovakia) and correlation possibilities with other Paratethyan biozonations. Additionally, the facies evolution and vegetation patterns are studied based on organic-walled microplankton and sporomorphs The Modrany (M-1) core contained the most complete microplankton assemblages, the other studied cores (Nová Vieska, Diakovce, Kolárovo, Dunajská Streda) provided only additional data. Three zones were distinguished : Early Pannonian Spiniferites bentorii pannonicus-Spiniferites bentorii oblongus Zone and Spiniferites bentorii coniunctus-Pontiadinium pecsvaradensis Zone and the early late Pannonian Spiniferites paradoxus Zone. The two zones are correlatable to the Pannonian assemblages in Hungary and Croatia. The lack of the Mecsekia plexus in the lowermost Pannonian samples in Slovakia points to either a gap between the Sarmatian and Pannonian stages or questions the interregional feasibility of the Hungarian and Croatian zonations and suggests a very strong facies control on time equivalent microplankton assemblages. The signal of the late early Pannonian transgression of the lake is visible in the increasing number of proximate dinoflagellate cysts in the two older zones indicating open–more distal environments with regard to the former coastal line. The youngest S. paradoxus Zone is equivalent with the early late Pannonian zones in Croatia and Hungary. These assemblages are very poor, host only few dinoflagellates indicating unfavourable habitats for dinocysts in the Danube Basin. Younger dinoflagellate assemblages were not recorded, as in the younger part of the late Pannonian the study area was filled up by fluvial sediments and smaller lakes only prevailed isolated from Lake Pannon. In the pollen spectra from early Pannonian broad- leaved deciduous elements dominate with some termophilous elements, e.g. Engelhardtia, Laevigatosporites suggesting a warm-temperate climate and mixed mesophytic forests with deciduous oaks, Pinus and Cathaya together with abundant mountain conifers Picea and Abies. Tsuga is present in smaller proportions. Lowland vegetation is represented by Alnus, Liquidambar Ulmus, and indicating well-developed riparian forests and local swamps (Cupressaceae, Myrica).

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA