Exhumation in a convergent orogen: the western Tauern window
Exhumation in a convergent orogen: the western Tauern window
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聚合造山带的掘出：西陶恩窗口
DOI：
10.1111/j.1365-3121.1997.tb00015.x
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发表时间：
1997
期刊：
影响因子：
2.4
通讯作者：
N. Mancktelow
中科院分区：
文献类型：
--
作者：
Bernhard Fiigenschuh;D. Seward;N. Mancktelow
西部陶恩窗的去顶涉及低角度拆离断层（布伦纳断层）和增强的下盘侵蚀，同时伴有直立的反形式褶皱。这种组合反映了在持续的南北阿尔卑斯会聚过程中的造山带平行（AE-W）伸展。新的裂变径迹年龄建立了褶皱和断层的相对年代学，并证明位移并不总是容纳在同一表面上。在折返过程中，由于褶皱和断裂的相互作用，一些单元从主拆离断层的下盘迁移到上盘。该地区可以有效地分为三个不同的领域。(1)西部陶恩窗的彭尼尼克单元总是在断层的下盘，由于褶皱和侵蚀，在圆顶的核心有最大的折返。(2)陶恩窗以北的下奥阿尔卑斯山单元是布伦纳断层上盘的第一部分。在后来的阶段，这个单元又被挖掘了4-5公里，作为下盘的一部分，成为一个更离散的贯通断层（Silltal断层）。(3)陶恩窗以西的中奥阿尔卑斯山脉和上奥阿尔卑斯山脉一直位于悬壁之内。
Unroofing of the western Tauern window involved both low‐angle detachment faulting (Brenner Fault) and enhanced footwall erosion, contemporaneous with upright antiformal folding. This combination reflects orogen‐parallel (˜E–W) extension during continued ˜N–S Alpine convergence. New fission‐track ages establish the relative chronology of folding and faulting and demonstrate that displacement was not always accommodated on the same surface. During exhumation, some units migrated from the footwall to the hanging wall of the main detachment fault, due to the interplay between folding and faulting. The region can effectively be divided into 3 distinct domains. (1) The Penninic units of the western Tauern Window were always in the footwall to the fault, with maximum exhumation in the core of the dome, due to folding and erosion. (2) The Lower Austroalpine unit north of the Tauern Window was first part of the hanging wall to the Brenner Fault. At a later stage this unit was exhumed by a further 4–5 km as part of the footwall to a more discrete, through‐going fault (the Silltal Fault). (3) The Middle and Upper Austroalpine units west of the Tauern Window were always within the hanging wall.