Intraplate brittle deformation and states of paleostress constrained by fault kinematics in the central German platform

Intraplate brittle deformation and states of paleostress constrained by fault kinematics in the central German platform
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德国中部地台断层运动学约束的板内脆性变形和古应力状态

DOI:
10.1016/j.tecto.2016.11.033
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发表时间:
2017
期刊:
影响因子:
2.9
通讯作者:
Ustaszewski
Ustaszewski
中科院分区:
地球科学2区
文献类型:
--
作者:
Navabpour;Siegburg;Ustaszewski

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中欧构造演化反映了华力西造山运动后中新生代构造体制的差异。与每个构造体制有关的脆性变形主要局限于沿着主要断裂带,随着时间的推移,产生复杂的断裂模式和运动学,对引起事件的数量和连续性有不同的解释。相比之下,在变形较小的领域的断裂模式往往提供一个原始的结构清单。我们调查的脆性变形的一个相对稳定的,广泛的地区的德国中部平台使用断层滑动数据,以确定区域应力场所需的数据。在一个非经典的方法,为了避免局部应力的变化和误解,断层滑动数据按比例放大到整个研究区域的子集一致的运动学和年代学的沉积盖层和结晶基底岩石。直接应力张量反演是通过迭代精化过程进行的,并使用基于现场的观测验证了计算的应力张量。相对倾斜几何学标准和运动学变化指标表明,该地区经历了一系列的变形事件,首先是后三叠纪σ 3轴向NE-SW的正断层体制,然后是走滑和逆冲断层体制,σ 1轴向由N-S向NE-SW转变,推测发生在晚白垩世。两个较年轻的事件分别以新生代正向和斜向逆冲断裂体制为特征,其σ 3和σ 1轴分别为NW-SE向。盖层和基底岩石的断裂模式似乎记录了相同的应力状态。
The structural evolution of Central Europe reflects contrasting tectonic regimes after the Variscan orogeny during Mesozoic – Cenozoic time. The brittle deformation related to each tectonic regime is localized mainly along major fault zones, creating complex fracture patterns and kinematics through time with diverging interpretations on the number and succession of the causing events. By contrast, fracture patterns in less deformed domains often provide a pristine structural inventory. We investigate the brittle deformation of a relatively stable, wide area of the central German platform using fault-slip data to identify the regional stress fields required to satisfy the data. In a non-classical approach, and in order to avoid local stress variations and misinterpretations, the fault-slip data are scaled up throughout the study area into subsets of consistent kinematics and chronology for sedimentary cover and crystalline basement rocks. Direct stress tensor inversion was performed through an iterative refining process, and the computed stress tensors were verified using field-based observations. Criteria on relative tilt geometry and indicators of kinematic change suggest a succession of events, which begins with a post-Triassic normal faulting regime with σ3axis trending NE-SW. The deformation then follows by strike-slip and thrust faulting regimes with a change of σ1axis from N-S to NE-SW, supposedly in the Late Cretaceous. Two younger events are characterized by Cenozoic normal and oblique thrust faulting regimes with NW-SE-trending σ3and σ1axes, respectively. The fracture patterns of both the cover and basement rocks appear to record the same states of stress.
德国中部图林根森林西北部上石炭统-二叠纪地垒盆地形成和岩浆作用的时间:综述
DOI: --
发表时间: 2004
期刊: Geological Society Special Publication
影响因子: --
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期刊:
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DOI: --
发表时间: 2010
期刊:
影响因子: --
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