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| Titel |
Pannonian (Upper Miocene) deposits at Steinbrunn (Vienna Basin, Austria) |
| VerfasserIn |
M.-L. Grundtner, M. Harzhauser  , O. Mandic, S. Gier, M. Wagreich |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026941
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| Schlagwörter |
Sandgrube, Lakustrisches Sediment, Ton, Sandstein, Kalkstein, Sedimentologie, Fossilien, Paläofauna, Mollusca, Pannonium, Miozän, Neogen, Wiener Becken |
| Geograf. Schlagwort |
Österreich, Burgenland, Eisenstadt-Umgebung (Bezirk), Steinbrunn |
| Blattnummer |
77 [Eisenstadt] |
| Blattnummer (UTM) |
5202 [Eisenstadt] |
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| Zusammenfassung |
| The Steinbrunn sand pit is positioned at the southeastern margin of the Neogene Vienna
Basin, about 5 km west of Eisenstadt. It exposes Upper Pannonian (Upper Miocene)
lacustrine clays, sands and detritic limestones. The mollusc fauna allows a correlation with
the latest Lymnocardium schedelianum Zone and the early Mytilopsis neumayri/zahalkai
Zone, pointing to an age of c. 10 Ma. In terms of lithostratigraphy, the beds belong to the
Upper Miocene Cary Formation (informally termed Neufeld beds). The section
measured along a 100 m long quarry wall is structurally located in the gently ENE
dipping eastern limb of a NNW-SSE striking anticline. The 24-m-thick succession
represents a single coarsening and shallowing upward sequence. Three lithologic
units have been distinguished. The lower unit comprises 7 m clays and silts bearing
stringers with late Pannonian molluscs such as Mytilopsis neumayri and Melanopsis
sturii together with limnocardiid and unionid bivalve shells. Carbonate contents are
between 10 and 30The mineralogy of the clay samples was analyzed with X-ray
diffraction. The samples contain quartz, minor amounts of feldspar, high amounts
of calcite and dolomite, and the clay minerals smectite, muscovite and chlorite.
The entire succession has formed within a floodplain environment. The clayey
lower part represents lacustrine environments of local ponds. Geophysical logging
was performed (gamma-ray and magnetic susceptibility) in order to investigate the
depositional cyclicities observed within middle lithological unit. Spectral analysis suggests
the presence of sedimentary cycles with a frequency of c. 3 m. Such small scale
cycles might be the expression of the 21-ky-precessional cycles. Based on this
assumption, the 8 depositional cycles of the succession may represent a total time of 170
ka. |
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