The Katschberg normal fault borders the Tauern Window to the east and played a crucial role during Miocene lateral tectonic extrusion in the Eastern European Alps. In this study, 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 normal fault and its slip history. 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 between 21.1 ± 1.8 Ma and 12.2 ± 1.3 Ma and accommodated 27 ± 6 km of crustal extension at a total rate of 3.5 ± 0.3 km/Myr. 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 with a rate of 0.84 ± 0.08 km/Myr until present. A comparison with another Miocene low-angle normal fault in the Eastern Alps – the Brenner fault – reveals that the amount of extension accommodated by these faults decreases from west to east, which is consistent with an eastward decrease in N-S shortening. Therefore, Miocene deformation is greatest in the western Tauern Window near the Brenner normal fault where shortening in front of the Adriatic Indenter is at its maximum.

中文翻译：

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通过热运动学模型约束 Katschberg 正断层（东陶恩窗）的滑移历史：对新生代晚期东欧阿尔卑斯山构造演化的影响


Katschberg 正断层与东面的 Tauern Window 接壤，在东欧阿尔卑斯山的中新世横向构造挤压中发挥了关键作用。在这项研究中，我们提出了来自低温热年代学和热运动学模型的新冷却年龄，这些模型限制了 Katschberg 正断层下盘 Penninic 单元的挖掘历史及其滑移历史。下盘单元的锆石和磷灰石裂变轨道以及磷灰石 （U-Th）/He 的年龄分别为 16.0 ± 1.9 马 至 12.8 ± 1.4 马、10.4 ± 1.8 马 至 7.9 ± 1.3 马和 8.2 ± 0.8 马 至 3.9 至 3.9 ± 0.4 马。热运动学模型表明，Katschberg 正断层在 21.1 ± 1.8 马 和 12.2 ± 1.3 马之间活跃，以 3.5 ± 0.3 公里/Myr 的总速率容纳了 27 ± 6 公里的地壳延伸。正常断层结束后，挖掘工作以 0.21 ± 0.06 公里/Myr 的速度继续进行，直到 2.0 ± 0.5 马，以及 0.84 ± 0.08 公里/Myr 的速度直到现在。与东阿尔卑斯山的另一个中新世低角度正常断层——布伦纳断层——进行比较，可以发现这些断层容纳的延伸量从西向东减少，这与南北缩短向东的减少是一致的。因此，中新世变形在靠近 Brenner 正断层的西 Tauern Window 最大，那里亚得里亚海压头前面的缩短最大。