- 1Institut für Geologie und Paläontologie, Universität Münster, Corrensstraße 24, 48149 Münster, Germany
- 2Institut für Erdsystemwissenschaften, Abteilung Geologie, Leibniz Universität Hannover, Callinstraße 30, 30167 Hannover, Germany
- 3Geowissenschaftliches Zentrum der Universität Göttingen, Abteilung Sedimentologie/Umweltgeologie, Goldschmidtstraße 3, 37077 Göttingen, Germany
The Katschberg normal fault, which bounds the Tauern Window to the east, played a crucial role during Miocene lateral extrusion in the Eastern European Alps (Genser & Neubauer 1989; Scharf et al. 2013). We present new cooling ages from low-temperature thermochronology as well as thermo-kinematic models, which constrain the exhumation history of the Penninic units in the footwall of the Katschberg fault and its fault-slip history (Wolff et al. 2024). Zircon and apatite fission track and apatite (U-Th)/He ages from footwall units range from 16.0±1.9 Ma to 12.8±1.4 Ma, 10.4±1.8 Ma to 7.9±1.3 Ma, and 8.2±0.8 Ma to 3.9±0.4 Ma, respectively. Thermo-kinematic modeling indicates that the Katschberg normal fault was active with a total rate of 3.5±0.3 km/Myr from 21.1±1.8 Ma to 12.2±1.3 Ma and accommodated 27±6 km of crustal extension. After the end of normal faulting, exhumation continued with a rate of 0.21±0.06 km/Myr until 2.0±0.5 Ma and then accelerated to a rate of 0.84±0.08 km/Myr. A comparison with the Brenner low-angle normal fault at the western margin of the Tauern Window reveals that the amount of Miocene extension is higher in the west than in the east. This is consistent with an eastward decrease of N-S shortening in front of the Adriatic Indenter.
References
Genser, J., Neubauer, F. (1989) Mitt. Österr. Geol. Ges. 81, 233–243.
Scharf, A., Handy, M.R., Favaro, S., et al. (2013) Int. J. Earth Sci. 102, 1627–1654.
Wolff, R., Wölfler, A., Hampel, A., Dunkl, I. (2024) Tectonophysics 890, 230514.
How to cite: Wolff, R., Wölfler, A., Hampel, A., and Dunkl, I.: The slip history of the Katschberg normal fault (Eastern Tauern Window) from thermo-kinematic modeling and implications for the evolution of the Eastern European Alps, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-1616, https://doi.org/10.5194/egusphere-egu25-1616, 2025.
