Changing patterns of shortening and lateral extension, Exhumation of the Eastern Alpine orogenic core, Strain partitioning during orogenic indentation

我们试图了解如何折叠和伸展断层容纳造山地壳的横向运动在东端的陶恩窗在东阿尔卑斯山。这是确定阿尔卑斯型山脉带在板块缩进过程中如何垂直和横向生长的关键。我们将检验这样一种观点，即阿尔卑斯山脉这一部分的向东横向运动是对中新世到现在亚得里亚海微板块的凹陷的响应，涉及从N到S的伸展折返量的增加（朝向亚得里亚海压痕），这种延伸性的掘出是历时性的：Katschberg糜棱岩带在千米级褶皱期间或甚至可能之前的初始活动（Hochalm圆顶）屈服于脆性，高角度的正断层（可能仍然活跃？）由于褶皱向北迁移到限制Tauern Window东北部的左旋横推SEMP断层。为了确定伸展剥露的年龄、速率和数量，我们将横跨和沿着奥阿尔卑斯-奔尼尼克接触面进行一系列构造-年代学断面。这将涉及Rb/Sr微量取样、Ar/Ar原位激光测年以及锆石和磷灰石裂变轨迹活动，以限制隆起和造山带平行延伸的整个热历史和运动历史。该项目需要DFG雇用一名研究助理（BATIIa/2），并提供资金支持第二名研究助理（Dipl.-安德烈亚斯·沙尔夫（Andreas Scharf）已经受雇于柏林联邦大学。

We seek to understand how folding and extensional faulting accommodated lateral motion of orogenic crust at the eastern end of the Tauern Window in the Eastern Alps. This is key to determining how Alpine-type mountain belts grow, both vertically and laterally, during plate indentation. We will test the idea that eastward lateral motion of this part of the Alps in response to Miocene-to-present indentation of the Adriatic microplate involved increasing amounts of extensional exhumation from N to S (towards the Adriatic indenter) and that this extensional exhumation was diachronous: Initial activity of the Katschberg mylonite belt during or possibly even before km-scale folding (Hochalm dome) yielded to brittle, high-angle normal faulting (possibly still active?) as folding migrated northwards to the sinistral transpressive SEMP fault that bounds the northeastern part of the Tauern Window. To determine the age, rates and amounts of extensional exhumation, we will lay a series of structural-geochronological transects across and along the Austroalpine-Penninic contact. This will involve Rb/Sr microsampling, Ar/Ar in-situ laser dating and zircon and apatite fission-track campaigns to constrain the entire thermal and kinematic history of doming and orogen-parallel extension. The project requires one research assistant (BATIIa/2) to be employed by the DFG, and funds to support the activites of a second research assistant (Dipl.-Min. Andreas Scharf) already employed by the FU Berlin .