Publication details

Lower Miocene (upper Burdigalian, Karpatian) volcanic ashfall at the south-eastern margin of the Bohemian Massif in Austria – New evidence from Ar/ Ar-dating, palaeomagnetic, geochemical and mineralogical investigations

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Authors

ROETZEL Reinhard DE LEEUW Arjan MANDIC Oleg MÁRTON Emo NEHYBA Slavomír KUIPER Klaudia F. SCHOLGER Robert WIMMER-FREY Ingeborg

Year of publication 2014
Type Article in Periodical
Magazine / Source Austrian Journal of Earth Sciences
MU Faculty or unit

Faculty of Science

Citation
Field Geology and mineralogy
Keywords 40 39 Ar/ Ar - geochronology-magnetostratigraphy-zircon studies-geochemistry-Burdigalian Karpatian Straning
Description An Early Miocene acidic tuff that accumulated in a small tectonic graben at the south-eastern margin of the Bohemian Massif in 40 39 north-eastern Austria was dated by means of Ar/ Ar dating. Feldspar crystals from the tuff have an inverse isochron age of 17.23 ± 0.18 Ma, which is interpreted to reflect its crystallisation age. The tuff shows a reversed palaeomagnetic polarity and can be correlard ted with chron C5Cr of the late Burdigalian (early Karpatian) and with the lowstand systems tract (LST) of the Bur 4 global 3 order sea level cycle. The tephra originates from acid (rhyodacitic to dacitic) calc-alkaline arc volcanism. Our study demonstrates that the investigated volcaniclastics are significantly different from other Burdigalian (Eggenburgian, Ottnangian) and Langhian (early Badenian) tephra from the area with regard to their volcanic zircon and Rare Earth element (REE) composition. The volcanic source of the Straning tuffs might be traced back to the western Inner Carpathian volcanic arc. The tuffs are most likely genetically related to the Middle Rhyolite Tuff (late Burdigalian, Karpatian) of northern Hungary and southern Slovakia.
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