Structural style of the NW Zagros Mountains and the role of basement thrusting for its Mountain Front Flexure, Kurdistan Region of Iraq
Structural style of the NW Zagros Mountains and the role of basement thrusting for its Mountain Front Flexure, Kurdistan Region of Iraq
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伊拉克库尔德斯坦地区扎格罗斯山脉西北方向的构造样式及其山前弯曲的基底冲断作用
DOI：
10.1016/j.jsg.2020.104206
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发表时间：
2020
影响因子：
3.1
通讯作者：
Ustaszewski
中科院分区：
文献类型：
--
作者：
Zebari;Balling;Grützner;Navabpour;Ustaszewski
伊拉克库尔德斯坦地区扎格罗斯山前挠曲的西北段形成了一个突出的地形和构造台阶，将高褶皱带和山麓带分开。由于缺乏地下数据，几何形状的断层下面的这个弯曲和基底参与的程度受到很大的限制。为了克服这一点，我们估计结构救济沿沿着七个横断面的带和重建变形的几何形状，使用平衡的横截面。6个样带的平均结构起伏约为2.6公里。迭代运动学正演模拟沿着这些断面之一表明，一个多阶段的演变，涉及薄和厚皮变形可以解释所观察到的结构救济。我们的首选模型表明，早期拆离褶皱在中生代至新近纪继承叠加了NE倾斜基底扎根逆冲系统的累积位移为6.5公里。基底逆冲断层向上倾斜分叉为两个展布逆冲断层。而结构较高的扇容纳4.2公里的滑动和放大的锋面背斜，形成山前挠曲，较低和年轻的扇采取了2.3公里的滑动，这主要是转移到三叠纪基底拆离的山麓地带。横跨西北扎格罗斯的缩短量在c处计算。24.8公里.在地形较低的部分的带内的缩短量意味着晚中新世到第四纪的缩短率远低于大地测量导出的收敛率。
The NW segment of the Zagros Mountain Front Flexure in the Kurdistan Region of Iraq forms a prominent topographic and structural step separating the High Folded and Foothill zones. Due to scarcity of subsurface data, the geometry of faults underlying this flexure and the degree of basement involvement are poorly constrained. To overcome this, we estimated the structural relief along seven transects across the belt and reconstructed deformed geometries using balanced cross-sections. The average structural relief for six transects is around 2.6 km. Iterative kinematic forward modeling along one of these transects suggests that a multi-stage evolution involving both thin- and thick-skinned deformation can explain the observed structural relief. Our preferred model shows that early detachment folds in the Mesozoic to Neogene succession were overprinted by a NE-dipping basement-rooted thrust system with a cumulative displacement of 6.5 km. Up-dip, the basement thrust bifurcates into two splay thrusts. While the structurally higher splay accommodated 4.2 km of slip and amplified frontal anticlines to form the Mountain Front Flexure, the lower and younger splay took up 2.3 km of slip, which was mainly transferred into the Triassic basal detachment of the Foothill Zone. The shortening across the NW Zagros is calculated at c. 24.8 km. The shortening amount within the topographically low part of the belt implies that the Late Miocene to Quaternary shortening rate was much lower than the geodetically derived convergence rate.
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影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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