干旱区生态环境知识资源中心(Arid): Neoproterozoic Tectonic Events of Egypt

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	Neoproterozoic Tectonic Events of Egypt
	Abd El-Wahed Mohamed; Hamimi Zakaria
来源期刊	Acta Geologica Sinica
ISSN	1000-9515
出版年	2021
卷号	95 期号:4 页码:1366-1405
英文摘要	The Egyptian Nubian Shield (ENS) represents the northwestern part of the Arabian-Nubian Shield and the northern extension of the East African Orogen. The ENS is regarded as being formed due to northward-directed escape tectonics. It is characterized by mild accretion and suture zones dominated by major strike-slip zones with a commonly sinistral sense of movement; some shear zones display a dextral sense of shear. It is dominated by gneisses and migmatites in the south, arc volcaniclastic metasediments and highly dismembered ophiolites in the central parts, whereas its northern part is dominated by late- to post-tectonic granitoids. In southern Sinai, the Neoproterozoic rocks are grouped into four complexes, namely Feiran-Solaf, Sa'al-Zaghra, Kid and Taba. The ENS ophiolites were formed between 730-750 Ma, mainly in a supra-subduction zone setting. The ENS has undergone a Neoproterozoic deformation history involving three successive phases: (1) Early N-S shortening phase (D_1), (2) Syn-accretionary phase (D_2) and (3) Post-accretionary phase (D_3). The initial island-arc stage (780-730 Ma) is a N-S shortening phase initiated by collision between the Eastern Desert tectonic terrane to the north with both the Gebeit and Gabgaba terranes to the south (830-720 Ma). During the arc-splitting and back-arc spreading stage (730-620), voluminous syn-tectonic granitoids intruded into the ENS (750-610 Ma). The E- W-directed compressional/transpressional phase (620-450 Ma) led to the overall uplift of the central part of the ENS and consequently the development and exhumation of the core complexes in oblique convergent zones. The E-W intense shortening deformation resulted also in the formation of NW- and NE-striking sinistral and dextral strike-slip shear zones, respectively. The latest periods of the E-W-directed compressional/transpressional regime were characterized by deposition of the molasse-type Hammamat Sediments unconformably over the Dokhan Volcanics, or interbedded with them. The combined thrusting, folding and sinistral-reverse shearing structures have been interpreted to resulted from the E-Wdirected compressional/transpressional phase in response to the oblique shortening of the Arabian-Nubian Shield between East and West Gondwana.
英文关键词	Neoproterozoic deformation N-S shortening syn-accretionary phase post-accretionary phase Egyptian Nubian Shield
类型	Review
语种	英语
收录类别	CSCD
WOS类目	Geology
CSCD记录号	CSCD:7032123
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377396
作者单位	Abd El-Wahed Mohamed, Geology Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt.; Hamimi Zakaria, Department of Geology, Faulty of Science, Benha University, Benha, 13518, Egypt.
推荐引用方式 GB/T 7714	Abd El-Wahed Mohamed,Hamimi Zakaria. Neoproterozoic Tectonic Events of Egypt[J],2021,95(4):1366-1405.
APA	Abd El-Wahed Mohamed,&Hamimi Zakaria.(2021).Neoproterozoic Tectonic Events of Egypt.Acta Geologica Sinica,95(4),1366-1405.
MLA	Abd El-Wahed Mohamed,et al."Neoproterozoic Tectonic Events of Egypt".Acta Geologica Sinica 95.4(2021):1366-1405.