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Evolution of depositional systems and sedimentary cycles in Želiezovce Depression of the Danube Basin

Rybar S., Sarinova K., Sujan M., Halasova E., Hudackova N., Zlinska A., Kovac M., Kovacova M., Ruman A., Ledvenyiova L

Geology, Geophysics and Environment

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2015

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Vol. 41, no. 1

129

EN

Five deep wells (Pozba4, Pozba3, Dubnik1, Nová Vieska1, Modrany1), drilled in the Želiezovce depression of the south-east Danube Basin penetrate the Cenozoic sedimentary record in overall thickness ranging from 1000 m up to 3000 m. The total thickness gradually increases from South to the North. This area is well known for the complex geological structure related to the Central Western Carpathians and Transdanubian Range junction along the Hurbanovo – Diösjenö line. Many authors have studied this area in the past, nevertheless depositional systems, sedimentary cycles and the development of sedimentary facies were never understood in detail. The re-evaluation of biostratigraphy, paleoecology, sedimentology and the reinterpretation of e-logs were all incorporated into well correlations, what resulted in definition of four main sedimentary cycles: (1) the lowermost Oligocene cycle, consisting of mudstones with occasional sandstone intercalations, associated with slope to offshore marine environment. The age is supported by the presence of the NP 22 calcareous nannoplankton zone; (2) the transgressive Langhian (Lower Badenian) deposits, composed of mudstones with epiclastic volcanic material and tuffite beds were associated with nearshore to offshore environement. The age is supported by the NN4–NN5 calcareous nannoplankton zone; (3) the Serravallian (Upper Badenian-Sarmatian) cycle is composed mainly of mudstones with abundant Lithothamnium fragments associated with brackish, coastal pain environment. The age is confirmed by the NN6 calcareous nannoplankton zone and by the mass occurrence of fish scales and Ervilia dissita (Eichwald) bivalves; (4) the overlying strata represent the Tortonian-Pliocene (Pannonian-Pliocene) cycle. The strata consist mostly from claystone (lake environment) which is overlain by sandstone and siltstone layers (deltaic and alluvial plain environments). The Tortonian (Pannonian) age of the lowermost claystone is supported by finds of Dreissenidae bivalves. The Pliocene age is only inferred by superposition of the strata.

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Possible Jurassic/Cretaceous boundary regional stratotype for West Carpathian area near Zilina, Slovakia

Michalik J., Rehakova D., Halasova E., Lintnerova O.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2008

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T. 34, z. 3/1

197-198

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Biostratigraphy, magnetostratigraphy, C and O isotope distribution around the J/K boundary, the Brodno section (Kysuca Unit of the Pieniny Klippen Belt)

Michalik J., Rehakova D., Halasova E., Lintnerova O.

Volumina Jurassica

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2006

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Vol. 4, no. 1

190-191

EN

Detailed litho- and biostratigraphy of the Brodno section in contact zone of the Outer and the Central Western Carpathians was given by Michalík et al. (1990), VaĘíçek et al. (1992). Kimmeridgian and Tithonian condensed sequence of red nodular limestones (the Ammonitico Rosso facies) is referred to as the Czorsztyn Limestone Fm. Calcareous dinoflagellates Carpistomiosphaera borzai and Stomiosphaera moluccana indicate its Kimmeridgian age; Parastomiosphaera malmica, Carpistomiosphaera tithonica and Colomisphaera pulla indicate Early Tithonian age; calpionellids Chitinoidella boneti, Praetintinnopsella andrusovi, Crassicollaria intermedia, Crassicollaria brevis, Crassicollaria parvula, Crassicollaria colomi, confirm Middle to Late Tithonian age of this formation. Lower Berriasian part of this succession is represented by pale biomicritic wackestone (Pieniny Limestone Fm) with abundant Calpionella alpina. Strong subsidence and acceleration of “planktic rain” of nannofossils started on the Early/Middle Tithonian boundary where Polycostella beckmannii appeared. Helenea chiastia together with first small nannoconids are typical of the Middle and Late Tithonian. The Late Tithonian interval was specified by the FO of Rotelapillus laffitei and Litraphidites carniolensis. The Tithonian/Berriasian boundary was characterized by the FO of Nannoconus wintereri together with small nannoconids and by the FO of Nannoconus steinmanni minor. There is good correlation between the calcareous nannofossils distribution and the magnetostratigraphic zonation (HouĘa et al. 1996). In the M 20-M 19 interval, two distinct nannoevents were recognized: the dominance of Polycostella beckmannii (Chitinoidella Zone) and the appearance of calcareous nannofossil association with Helenea chiastia (Crassicolaria Zone). Carbon isotope curve from bulk carbonates of the J/K boundary sequence shows smooth trends resulted from equilibrated measure of bio-productivity and organic matter burial. The ä13C value ranges from 1.3 to 1.5‰ (PDB). The authentic character of the limestone record is underlined by relative high and conservative ä18O values (-2.27 to -0.88) of the same beds. These signals can be useful in global stratigraphic correlation in deep water carbonates.

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Foraminifera and calcareous nannofossils biostratigraphy of the Middle Miocene sediments of the borehole HGZ- 3 (Zeliezovce, Danube Basin, South Slovakia)

Zlinska A., Halasova E.

Biuletyn Państwowego Instytutu Geologicznego

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2001

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nr 396

167-168