Fault slip analysis and late exhumation of the Tauern Window, Eastern Alps
Fault slip analysis and late exhumation of the Tauern Window, Eastern Alps
复制标题
DOI：
10.1016/j.tecto.2015.01.002
复制
发表时间：
2015-05-09
期刊：
影响因子：
2.9
通讯作者：
Garcia, Sebastian
中科院分区：
文献类型：
--
作者：
Bertrand, Audrey;Rosenberg, Claudio;Garcia, Sebastian
从第三纪早期到中新世晚期，东阿尔卑斯山的折返主要集中在陶恩窗（Tauern Window），这是一个位于白云石压头前面的热和结构圆顶。基于整个陶恩窗新构造调查的应力反演表明古应力场的区域分区，在调查区域的核心区域以走滑应力状态为主，在穹顶的东部和西部边界则以伸展状态为主。很少有逆断层结构被强调。我们提出了两阶段变形历史，以解释表征延性域和脆性域的不同类型的结构。在陶恩窗折返的第一阶段，对应于折叠事件，脆性地壳可能以南北缩短和压缩为主。第二阶段折返的特点是穹顶边界的正断层和核心的走滑断层。在第二阶段中，先前受到属于第一阶段的压缩结构影响的地壳脆性部分被侵蚀。与沿着陶恩窗东部和西部边界的东西向延伸相关的正断层被位于陶恩窗核心的走滑断层所适应，产生了东西向延伸和南北向缩短。伸展轴的方向和应力张量的性质与中阿尔卑斯山内部基底地块后期脆性叠印的推断相似，表明可能存在共同的、大规模的应力状态，其作用范围远远超出东阿尔卑斯山地区。 (C) 2015 Elsevier B.V. 保留所有权利。
Exhumation of the Eastern Alps from the early Tertiary to the late Miocene was localized mainly in the Tauern Window, a thermal and structural dome located in front of the Dolomites indenter. Stress inversions based on new structural investigations over the entire Tauern Window indicate a regional zoning of the paleostress field with a predominance of strike-slip states of stress in the core of the investigated area, and dominant extensional regimes in the eastern and western borders of the dome. Few inverse fault structures have been highlighted. We propose a two-stage deformation history in order to explain the different types of structures that characterise the ductile and the brittle domains. During the first stage of exhumation of the Tauern Window, corresponding to the folding event, the brittle crust was probably dominated by N-S shortening and compression. The second stage of exhumation was marked by normal faulting at the borders of the dome and strike-slip faulting in the core. During the second stage, the brittle part of the crust that was previously affected by compressive structures belonging to the first stage was eroded. Normal faulting associated to E-W extension along the eastern and western borders of the Tauern Window was accommodated by strike-slip faulting located in the core of the Tauern Window, yielding E-W extension and N-S shortening. The orientation of the extensional axes and the nature of the stress tensors are similar to the ones inferred for the late-stage, brittle overprint of the internal basement massifs of the Central Alps pointing to a possible common, large-scale, state of stress acting well beyond the area of the Eastern Alps. (C) 2015 Elsevier B.V. All rights reserved.