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Tectonic Evolution of the Western High Atlas of Morocco: Oblique Convergence, Reactivation, and Transpression
Tectonics ( IF 4.2 ) Pub Date : 2020-03-21 , DOI: 10.1029/2019tc005563
R. Lanari 1 , C. Faccenna 1, 2 , M. G. Fellin 3 , A. Essaifi 4 , A. Nahid 4 , F. Medina 5 , N. Youbi 4, 6
Affiliation  

The High Atlas of Morocco is a double‐vergent mountain belt developed by Cenozoic shortening and inversion of a Triassic‐Jurassic rift. The structural setting, the morphometric features, and the patterns of exhumation through time and space change remarkably both along and across the strike. Here we combine structural data with revised thermochronological data to unravel the kinematic and evolution of the western High Atlas. Our results show that the structural grain of the western High Atlas is defined by two main groups of faults, namely, thrust and oblique‐slip faults, which mainly strike subparallel from W‐E to NE‐SW. The slip direction of the thrust structures is NNW‐SSE to NW‐SE oriented, and the slip direction of the oblique‐slip faults is WSW‐ENE to NW‐SE oriented. Pieces of thermochronological and geological evidence indicate that in the last ~10 Ma the exhumation rate increased during the activity thrusts and oblique‐slip faults. The coexistence of these two fault systems also suggests partitioning of deformation under a transpressive regime. In the western High Atlas, we estimate a displacement of ~12 km on the frontal thrusts and of at least ~22 km on the axial oblique‐slip structures. Thrusts and oblique‐slip structures together result in a total cumulative displacement of ~25 km, which represents about half of the Africa‐Eurasia convergence.

中文翻译:

摩洛哥西部高图集的构造演化:斜交汇,活化和压抑

摩洛哥高图集是由三叠纪-侏罗纪裂谷新生代缩短和倒转发展而成的双折山脉。沿罢工及穿越罢工的结构设置,形态特征以及随时间和空间的掘尸模式显着变化。在这里,我们将结构数据与修正的热年代学数据结合起来,以揭示西部高图集的运动学和演化。我们的结果表明,西部高图集的构造晶粒由两个主要断层组定义,即逆冲断层和斜滑断层,主要断层从西至东平行于南北向。逆冲构造的滑动方向为NNW‐SSE到NW‐SE方向,倾斜滑动断层的滑动方向为WSW‐ENE到NW‐SE方向。一些热年代学和地质学证据表明,在活动末期的推力作用和斜滑断层期间,发掘速率在最后一个约10 Ma内增加。这两个断裂系统的共存还表明在超压状态下变形的划分。在西部的高地图集上,我们估计正面推力的位移约为12 km,而轴向斜滑结构的位移至少约为22 km。推力和斜滑结构共同导致总累积位移约25 km,约占非洲-欧亚大陆汇合的一半。我们估计前推力的位移约为12 km,轴向斜滑结构的位移至少约为22 km。推力和斜滑结构共同导致总累积位移约25 km,约占非洲-欧亚大陆汇合的一半。我们估计前推力的位移约为12 km,轴向斜滑结构的位移至少约为22 km。推力和斜滑结构共同导致总累积位移约25 km,约占非洲-欧亚大陆汇合的一半。
更新日期:2020-03-21
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