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DOI	10.1016/j.precamres.2020.106072
	A review and synthesis of strain studies in the Egyptian Nubian Shield: materials, methods, problems and prospects
	Fowler, Abdel-Rahman; Hamimi, Zakaria
通讯作者	Fowler, AR (corresponding author), United Arab Emirates Univ, Fac Sci, Geol Dept, Al Ain, U Arab Emirates.
来源期刊	PRECAMBRIAN RESEARCH
ISSN	0301-9268
EISSN	1872-7433
出版年	2021
卷号	355
英文摘要	More than seventy strain studies in the Egyptian Nubian Shield (ENS) are reviewed in this contribution. For the Hammamat basin strain studies, Rf/phi and Fry methods have been applied to pebble sections, mudcracks and raindrop prints. Consideration of pebble fabrics in undeformed outcrops suggests that R-XZ estimates of less than 1.7 based on pebble ellipse data are doubtful. Extracted pebbles are also popular strained objects for analysis. Average Wadell sphericity and percentage of blades assist recognition of pebble strains in the Kareim, Queih, Igla and Seleimat basins. Feiran gneissic complex strains, measured using boudins and folds are much higher (X/Z > 15) than the reported strains for the Hafafit gneissic complex (X/Z usually < 2.5) that used metamorphic grain shapes and centres. The low Hafafit strains may result from progressive resetting of grain shapes and relocation of grains by diffusional effects during HT metamorphism. The Barramiya-Mubarak thrust belt provides a good example of focused study on ENS shear zones strain, with variable correlations between Rf/phi and Fry results, but consistently low k values. South Eastern Desert (SED) shear zone prolate strain ellipsoids record the effects of multiple deformation. The extensional shear zone overlying the Meatiq complex shows extreme strain and strongly prolate strain ellipsoids. ENS vorticity studies, applying PAR and RGN methods, have yielded higher W-m (> 0.5) for transpressional shears (Barramiya-Mubarak belt and Atalla shear zone) than for transtensional shears (W-m < 0.5). Volume strains have rarely been considered in the ENS, though evidence exists for negative (due to pressure solution) and positive (due to microveining) volume change during deformation. The ENS strain database can be improved by better documentation of sampling methods; better knowledge of primary fabrics; and by testing strain results using a range of materials. AMS-strain studies may broaden the range of lithologies suitable for strain measurement.
英文关键词	Egyptian Eastern Desert Sinai Finite strain Vorticity Volume strain
类型	Review
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000652026000003
WOS关键词	CENTRAL EASTERN DESERT ; WADI MUBARAK BELT ; NEOPROTEROZOIC STRUCTURAL EVOLUTION ; ISLAND-ARC ASSEMBLAGES ; NUGRUS SHEAR ZONE ; FINITE STRAIN ; KINEMATIC VORTICITY ; CORE COMPLEX ; MAGNETIC-SUSCEPTIBILITY ; HAFAFIT CULMINATION
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/2XILL650/351423
作者单位	[Fowler, Abdel-Rahman] United Arab Emirates Univ, Fac Sci, Geol Dept, Al Ain, U Arab Emirates; [Hamimi, Zakaria] Benha Univ, Dept Geol, Faulty Sci, Banha 13518, Egypt
推荐引用方式 GB/T 7714	Fowler, Abdel-Rahman,Hamimi, Zakaria. A review and synthesis of strain studies in the Egyptian Nubian Shield: materials, methods, problems and prospects[J],2021,355.
APA	Fowler, Abdel-Rahman,&Hamimi, Zakaria.(2021).A review and synthesis of strain studies in the Egyptian Nubian Shield: materials, methods, problems and prospects.PRECAMBRIAN RESEARCH,355.
MLA	Fowler, Abdel-Rahman,et al."A review and synthesis of strain studies in the Egyptian Nubian Shield: materials, methods, problems and prospects".PRECAMBRIAN RESEARCH 355(2021).