干旱区生态环境知识资源中心(Arid): Origin of two different deformation styles via active folding mechanisms of inverted Abu El Gharadiq Basin, Western Desert, Egypt

Arid

DOI	10.1016/j.jafrearsci.2021.104331
	Origin of two different deformation styles via active folding mechanisms of inverted Abu El Gharadiq Basin, Western Desert, Egypt
	Shalaby, Ahmed; Sarhan, Mohammad Abdelfattah
通讯作者	Sarhan, MA (corresponding author), Damietta Univ, Dept Geol, Fac Sci, New Damietta 34517, Egypt.
来源期刊	JOURNAL OF AFRICAN EARTH SCIENCES
ISSN	1464-343X
EISSN	1879-1956
出版年	2021
卷号	183
英文摘要	The Abu El Gharadiq Basin (AGB) is one of the largest Cretaceous rift basins in the northern district of the Western Desert of Egypt. The AGB underwent tectonic inversion in the Upper Cretaceous through horizontal shortening in the NW-SE direction. Detailed interpretation of seismic sections across discrete regions of this basin shows that the rocks deformed in two different depth-related deformation styles, which are partitioned across the base of the so called Bahariya Formation of Cenomanian age. The deeper, pre-Cenomanian rock units show contractional deformation forming tight folds and related fabrics while shallower, post-Cenomanian rock units display features of extensional deformation. These are essentially shallowly undulating open folds, associated with conjugate normal faults and tensional fractures. The deeper pre-Cenomanian tight anticlines pierce the upper rock units as diapiric-like intrusions that are seen on the seismic sections as hazy regions. We infer that the two different deformation styles above and below the Cenomanian rocks occurred simultaneously. The hazy regions on the seismic sections may result from lateral flow of shale rocks that give rise to chaotic structures near the anticlines. Mechanical anisotropy across the Cennomanian rock unit is inferred to be the main cause of simultaneous emergence of contractional and extensional deformations. Re-evaluation of fracture patterns of the northern rift basins in the Western Desert implies that the AGB originated in an extensional stepover region of a discrete, ENE-WSE trending, shear zone whose margins underwent inversions, developing two parallel thrustdominated ridges, namely the crustal scale Kattaniya and Qattara-Alamein ridges.
英文关键词	Structural interpretation Folding mechanism Abu Gharadig Basin Upper Cretaceous Seismic interpretation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000693027900001
WOS关键词	STRUCTURAL EVOLUTION ; CENTRAL-AFRICA ; NORTHERN ; FIELD ; INVERSION ; REJUVENATION ; DETACHMENT ; EXTENSION ; STRAIN ; IMPACT
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363708
作者单位	[Shalaby, Ahmed] Mansoura Univ, Dept Geol, Fac Sci, Mansoura 35516, Egypt; [Sarhan, Mohammad Abdelfattah] Damietta Univ, Dept Geol, Fac Sci, New Damietta 34517, Egypt; [Sarhan, Mohammad Abdelfattah] Damietta Univ, Ctr Space Res & Applicat CSRA, New Damietta, Egypt
推荐引用方式 GB/T 7714	Shalaby, Ahmed,Sarhan, Mohammad Abdelfattah. Origin of two different deformation styles via active folding mechanisms of inverted Abu El Gharadiq Basin, Western Desert, Egypt[J],2021,183.
APA	Shalaby, Ahmed,&Sarhan, Mohammad Abdelfattah.(2021).Origin of two different deformation styles via active folding mechanisms of inverted Abu El Gharadiq Basin, Western Desert, Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,183.
MLA	Shalaby, Ahmed,et al."Origin of two different deformation styles via active folding mechanisms of inverted Abu El Gharadiq Basin, Western Desert, Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 183(2021).