The Styrian Basin: A key to the middle miocene (Badenian/Langhian) Central Paratethys transgressions

Autor(en)

Peter Pervesler, Alfred Rögl, Johann Hohenegger, Robert Scholger, Stjepan Coric

Abstrakt

In the Styrian Basin, early Miocene marine sedimentation of the Karpatian (upper Burdigalian) ended with basin shallowing, marked

regression and tectonic movements. The Karpatian sedimentation cycle corresponds to the global 3rd order cycle TB 2.2, followed

by the Bur5/Lan1 sea-level fall. This regression was combined with tectonic movements (the Styrian Tectonic Phase), seen in

the Styrian Unconformity by an angular discordance at the Wagna and Katzengraben outcrops and also in deep wells. Sediments of

the first middle Miocene (Badenian/Langhian) transgression are commonly eroded or reduced in thickness at the basin borders. In

the basin center, the bathyal environment continues from the Karpatian to the Badenian. Sediments of the first Badenian transgression

have been dated by calcareous nannoplankton as NN4 and correlated by the occurrence of Praeorbulina sicana with the basal

Langhian. The 3rd order sequence corresponds to TB 2.3. The erosional phase of the sea-level fall Lan2/Ser1 can only be observed

in near-shore facies, followed by transgressive beds within Zone NN5, which represents the second, main Badenian transgression

in the Central Paratethys and corresponds to the long global cycle TB 2. The highstand system tract of this cycle is expressed in

carbonate build-ups of the Weissenegg Formation. According to the global 3rd order sequences, the youngest sediments of the

Retznei section (<14.39 Ma) overlying the carbonate buildups belong to the falling-stage system tract of TB2, but did not record

regression, but instead continuous deepening of the Styrian Basin, indicating strong subsidence during the early middle Miocene.

Organisation(en)

Institut für Paläontologie

Externe Organisation(en)

Montanuniversität Leoben, Geologische Bundesanstalt

Journal

Austrian Journal of Earth Sciences

Band

102

Seiten

102-132

Anzahl der Seiten

31

ISSN

0251-7493

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

106001 Allgemeine Biologie, 105101 Allgemeine Geologie

Sustainable Development Goals

SDG 14 – Leben unter Wasser

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