Naslov
Middle and Upper Miocene Palynology from the South-western Parts of the Pannonian Basin

Autori
Bakrač, Koraljka

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

Izvornik
2nd International workshop: „ Neogene of Central and South-Eastern Europe“ / Gross, Martin - Graz : Landesmuseum Joanneum, 2007, 11-13

Skup
2nd International workshop: „ Neogene of Central and South-Eastern Europe“

Mjesto i datum
Kapfenstein, Austrija, 17.05.2007. - 21.05.2007

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Miocene; palynology; dinoflagellate; biozonation; Paratethys

Sažetak
Palynological characterization of the Middle and Upper Miocene deposits from the Croatian part of the Pannonian Basin has resulted in a palynological zonation of the compositional development of the successive dinocyst assemblages. Seven characteristic palynozones of regional palynostratigraphic range and eight local subzones can be recognized. The first zone is Unipontidinium aquaeductum Zone, of Badenian age. Leading form is from deeper and distal environment, associated by Nematosphaeropsis lemniscata, Batiacasphaera sphaerica and Impagidinium patulum. It could be correlated with Mediterranean zone of the same name Unipontidinium aquaeductum - LAN6, from the Serravallian of Italy (Powell, 1986 ; Zevenboom 1995). During Badenian, based on the following dinocyst assemblage: Systematophora placacantha, Spiniferites spp, Operculodinium spp., Hystrichokolpoma cinctum, Melitasphaeridium machaerophorum, Systematophora placacantha Zone is defined in proximal, open, marine environment. Sarmatian Polysphaeridium zoharyi - Lingulodinium machaerophorum Zone is characterized by relatively rich marine community, but the most forms are euryhaline like Polysphaeridium zoharyi and Lingulodinium machaerophorum. Prasinophyta genera Leiosphaeridia, Tytthodiscus, Hidasia and Mecsekia are very important in the Sarmatian Cymatiosphaera miocaenica Zone, which characterizes stratified environment. Lowest Pannonian Mecsekia ultima Zone is, also, characterized by the domination of prasinophyts, especially by the genera Mecsekia. The succeeding zone is Spiniferites bentorii Zone that can be correlated with the same named zone in Hungary (Sütő -Szentai, 1988). Based on the dominance of following species it is subdivided into three subzones: Spiniferites bentorii pannonicus, Spiniferites bentorii oblongus, and Pontiadinium pecsvaradensis. In the upper part of this zone few Mediterranean dinocyst species is recognized, indicated communication between Mediterranean and Paratethys at that time. The beginning of the succeeding Spiniferites balcanicus Zone is defined by the dominance of the same species. This zone characterizes the upper Pannonian deposits. The assemblages of the upper part of the Spiniferites balcanicus Zone are similar to the Hungarian Spiniferites balcanicus Zone (Sütő-Szentai, 1988). The dominance of the Galeacysta etrusca marks the beginning of the Galeacysta etrusca Zone. This zone characterizes uppermost Pannonian distal deposits and it can be correlated both, with same named zone in Hungary (Sütő-Szentai, 1988) and the Messinian “ lago-mare” in Italy (Zevenboom, 1995). It could be separated into subzones G. etrusca - Spiniferites virgulaeformis and G. etrusca - Spiniferites cruciformis. After disintegration of the Central Paratethys at the end of Sarmatian, and the rise of Lake Pannon, two main transgression-regression cycles are documented in the Upper Miocene deposits. During the maximum transgression of the first cycle in the middle Pannonian (= Pannon E sensu Papp et al. 1985 ; = upper Pannonian sensu Stevanović et al 1990) Mediterranean dinoflagellates migrated into the Pannonian Basin. The connection established with the Eastern Paratethys at the end of Pannonian (= Upper Pontian sensu Stevanovic et al 1990 ; Magyar et al. 1999) enabled the endemic Lake Pannon dinoflagellate taxa to migrate via Eastern Paratethys into the Mediterranean.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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