Structural assessment of the Bradost and Berat structures in Imbricate and High Folded zones—Iraqi Kurdistan Zagros belt
Structural assessment of the Bradost and Berat structures in Imbricate and High Folded zones—Iraqi Kurdistan Zagros belt
复制标题
叠瓦状和高褶皱带的布拉多斯特和培拉特构造评估——伊拉克库尔德斯坦扎格罗斯带
DOI：
--
复制
发表时间：
2019
影响因子：
--
通讯作者：
A. Omar
中科院分区：
文献类型：
--
作者：
Hassan Ghazi Kakameen Balaki;A. Omar
Bradost和Berat背斜分别位于伊拉克库尔德斯坦地区扎格罗斯褶皱冲断带西北段的叠瓦带和高褶皱带内。在综合地质观测、少量新的地震资料和钻井资料的基础上，在这两个背斜上建立了两个平衡剖面，以揭示所研究的褶皱和断层结构从地表到地下的变化。这项研究旨在了解Bradost和Berat逆冲背斜的层序演化。所研究的剖面表明，贝拉特构造代表具有弹出式几何形状的逆冲相关背斜，而布拉多斯特构造由两种不同几何形状的组合和在每一段沿走向变形的样式组成。因此，Bradost结构在其中一段中表现为正花结构，在另一段中表现为与斜坡相关的背斜。这一构造现象表明，在Bradost构造中发育了两个不同的段，而不是一个胚胎背斜，这两个背斜后来通过横向的Hadar-Bekhme基底断层相连，在两个段的递进侧向生长过程中。在布拉多斯特和贝拉特构造，逆冲作用所适应的缩短值分别为~ 991m和~ 553m。这种缩短的差异是由于逆冲过程的强度，在Bradost构造中比在Berat构造中要高。目前的研究表明，Berat和Bradost构造下方的下伏双重构造主要负责调节所研究构造的潜在隆升，而不是叠瓦状逆冲系统。根据剖面获得的褶皱变形几何学，所研究的构造在上古生界奥拉页岩组内解耦。横截面的整体变形几何体表示薄蒙皮变形和厚蒙皮变形的组合。
The Bradost and Berat anticlines are located within the Imbricate and High Folded zones of the NW segment of the Zagros fold-thrust belt, respectively, in the Iraqi Kurdistan Region. Two balanced cross-sections were built across these two anticlines, based on the integration of geological observations, few new available seismic, and well data, in order to unravel changes in the studied fold and fault architectures, from the surface to subsurface. The study aims to understand the sequential evolution of the Bradost and Berat thrusted anticlines. The studied sections imply that the Berat structure represents thrust-related anticline with pop-up geometry, whereas the Bradost structure comprises combination of two different geometries and styles of deformation along strike at each of the segments. So, the Bradost structure appears as a positive flower structure in one of the segments and as a ramp-related anticline in another segment. This structural phenomenon suggests development of two different segments instead of one embryonic anticline in the Bradost structure, which were later connected via transverse Hadar-Bekhme basement fault, during a progressive lateral growth of the two segments. The shortening values that were accommodated by the thrusts are ~ 991 m and ~ 553 m at the Bradost and Berat structures respectively. This variation in shortening is due to intensity of thrusting process which is higher in the Bradost structure than that in the Berat. The current study suggests that the underlying duplex structures below both Berat and Bradost structures are primarily responsible for the accommodation the potential uplifting of the studied structures, rather than the imbricate thrust system. Based on the obtained deformed geometry of the folds from the cross sections, the studied structures were decoupled within the Upper Paleozoic Ora Shale Formation. The overall deformed geometry of the cross sections indicates combination of thin- and thick-skinned deformation.
影响因子：
4.2
作者：
P. Ballato;N. Nowaczyk;A. Landgraf;M. Strecker;A. Friedrich;S. Tabatabaei
通讯作者：
P. Ballato;N. Nowaczyk;A. Landgraf;M. Strecker;A. Friedrich;S. Tabatabaei