干旱区生态环境知识资源中心(Arid): Transpressive Structures in the Ghadir Shear Belt, Eastern Desert, Egypt: Evidence for Partitioning of Oblique Convergence in the Arabian-Nubian Shield during Gondwana Agglutination

Arid

DOI	10.1111/1755-6724.13882
	Transpressive Structures in the Ghadir Shear Belt, Eastern Desert, Egypt: Evidence for Partitioning of Oblique Convergence in the Arabian-Nubian Shield during Gondwana Agglutination
	Abd El-Wahed, Mohamed; Kamh, Samir; Ashmawy, Mahmoud; Shebl, Aly
通讯作者	Abd El-Wahed, Mohamed
来源期刊	ACTA GEOLOGICA SINICA-ENGLISH EDITION
ISSN	1000-9515
EISSN	1755-6724
出版年	2019
卷号	93 期号:6 页码:1614-1646
英文摘要	Transpressional deformation has played an important role in the late Neoproterozoic evolution of the Arabian-Nubian Shield including the Central Eastern Desert of Egypt. The Ghadir Shear Belt is a 35 km-long, NW-oriented brittle-ductile shear zone that underwent overall sinistral transpression during the Late Neoproterozoic. Within this shear belt, strain is highly partitioned into shortening, oblique, extensional and strike-slip structures at multiple scales. Moreover, strain partitioning is heterogeneous along-strike giving rise to three distinct structural domains. In the East Ghadir and Ambaut shear belts, the strain is pure-shear dominated whereas the narrow sectors parallel to the shear walls in the West Ghadir Shear Zone are simple-shear dominated. These domains are comparable to splay-dominated and thrust-dominated strike-slip shear zones. The kinematic transition along the Ghadir shear belt is consistent with separate strike-slip and thrust-sense shear zones. The earlier fabric (S-1), is locally recognized in low strain areas and SW-ward thrusts. S-2 is associated with a shallowly plunging stretching lineation (L-2), and defines similar to NW-SE major upright macroscopic folds in the East Ghadir shear belt. F-2 folds are superimposed by similar to NNW-SSE tight-minor and major F-3 folds that are kinematically compatible with sinistral transpressional deformation along the West Ghadir Shear Zone and may represent strain partitioning during deformation. F-2 and F-3 folds are superimposed by ENE-WSW gentle F-4 folds in the Ambaut shear belt. The sub-parallelism of F-3 and F-4 fold axes with the shear zones may have resulted from strain partitioning associated with simple shear deformation along narrow mylonite zones and pure shear-dominant deformation in fold zones. Dextral ENE-striking shear zones were subsequently active at ca. 595 Ma, coeval with sinistral shearing along NW- to NNW-striking shear zones. The occurrence of upright folds and folds with vertical axes suggests that transpression plays a significant role in the tectonic evolution of the Ghadir shear belt. Oblique convergence may have been provoked by the buckling of the Hafafit gneiss-cored domes and relative rotations between its segments. Upright folds, fold with vertical axes and sinistral strike-slip shear zones developed in response to strain partitioning. The West Ghadir Shear Zone contains thrusts and strike-slip shear zones that resulted from lateral escape tectonics associated with lateral imbrication and transpression in response to oblique squeezing of the Arabian-Nubian Shield during agglutination of East and West Gondwana.
英文关键词	Arabian-Nubian Shield Ghadir shear belt transpression splay-dominated and thrust-dominated strike-slip shear zones Egypt
类型	Article
语种	英语
国家	Egypt
收录类别	SCI-E
WOS记录号	WOS:000505305900002
WOS关键词	WADI HAFAFIT CULMINATION ; CORE COMPLEX ; GOLD MINERALIZATION ; OPHIOLITIC MELANGE ; GNEISSIC COMPLEX ; IMBRICATE ZONE ; AFRICAN OROGEN ; SOUTH-INDIA ; KAOKO BELT ; EVOLUTION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
EI主题词	2019-12-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311102
作者单位	Tanta Univ, Geol Dept, Fac Sci, Tanta 31527, Egypt
推荐引用方式 GB/T 7714	Abd El-Wahed, Mohamed,Kamh, Samir,Ashmawy, Mahmoud,et al. Transpressive Structures in the Ghadir Shear Belt, Eastern Desert, Egypt: Evidence for Partitioning of Oblique Convergence in the Arabian-Nubian Shield during Gondwana Agglutination[J],2019,93(6):1614-1646.
APA	Abd El-Wahed, Mohamed,Kamh, Samir,Ashmawy, Mahmoud,&Shebl, Aly.(2019).Transpressive Structures in the Ghadir Shear Belt, Eastern Desert, Egypt: Evidence for Partitioning of Oblique Convergence in the Arabian-Nubian Shield during Gondwana Agglutination.ACTA GEOLOGICA SINICA-ENGLISH EDITION,93(6),1614-1646.
MLA	Abd El-Wahed, Mohamed,et al."Transpressive Structures in the Ghadir Shear Belt, Eastern Desert, Egypt: Evidence for Partitioning of Oblique Convergence in the Arabian-Nubian Shield during Gondwana Agglutination".ACTA GEOLOGICA SINICA-ENGLISH EDITION 93.6(2019):1614-1646.