Jamrich M. & Halásová E., 2010: The evolution of the Late Badenian calcareous nannofossil assemblages as a reflexion of the palaeoenvironmental changes of the Vienna Basin (Devínska Nová Ves – clay pit). Acta Geologica Slovaca, 2, 2, 123–140. (in Slovak with English summary)

Vývoj spoločenstiev vápnitých nanofosílií Viedenskej panvy ako odraz paleoenvironmentálnych zmien počas vrchného bádenu (Devínska Nová Ves – tehelňa)

The evolution of the Late Badenian calcareous nannofossil assemblages as a reflexion of the palaeoenvironmental changes of the Vienna Basin (Devínska Nová Ves – clay pit)

Michal Jamrich & Eva Halásová

Katedra geológie a paleontológie, Prírodovedecká fakulta, Univerzita Komenského v Bratislave, Mlynská dolina G, 842 15 Bratislava; jamrich@fns.uniba.sk, halasova@fns.uniba.sk

Abstract

This paper discusses the results of the calcareous nannofossils study from the Studienka Formation of the Vienna Basin, locality Devínska Nová Ves – clay pit (section DNV 1). Quantitative analysis of nannofossil assemblages from the sixty nine samples of the studied profile were performed. The age of sediments was determined as Late Badenian and correlated with NN6 Discoaster exilis Zone. Abundance patterns indicate: (1) prevailing of small Reticulofenestra over Coccolithus pelagicus (indicating nearshore environment with nutrient supply); (2) abundance of Holodiscolithus macroporus, low abundance of sphenoliths and rare discoasterids (cooling trend); (3) local enrichment of species Helicosphaera carteri, H. wallichii and Syracosphaera pulchra (eutrophy); (4) higher abundance of Braarudosphaera bigelowii bigelowii, B. bigelowii parvula (salinity decrease); (5) locally higher abundance of helicospherids and reworked nannofossils (higher turbulence of palaeoenvironment). Increased abundances of the species Holodiscolithus macroporus were noticed and quantified for the first time in the Upper Badenian sediments of the Central Paratethys. Cluster analysis was performed on the assemblage data. Four groups related to different temperature, trophic and salinity conditions have been distinguished.

Key words: Vienna Basin, Studienka Formation, Devínska Nová Ves – clay pit, Late Badenian, calcareous nannofossils, statistics, biostratigraphy, palaeoecology

Manuscript received: 2010-03-04

Revised version accepted: 2010-10-22