Structural setting of the Hafafit Gneisses Eastern Desert, Egypt

Abdel-Khalek, M.L.; Abdelwahed, Mohamed F.

doi:10.1016/0301-9268(82)90130-9

Cited by 6 publications

(5 citation statements)

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“…The S1 foliations are folded about NE-SW trending inclined folds termed F2, and later NW-SE upright folds termed F3 folds. We agree with Abdel-Wahed and Abdel-Khalek (1983) in correlating the F2 and F3 folds in the Central Eastern Desert low-grade metamorphics with the F2 and F3 folds in the Migif-Hafafit gneisses.…”

Section: Central Eastern Desert Low-grade Metamorphicssupporting

confidence: 85%

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The Sha’it–Nugrus shear zone separating Central and South Eastern Deserts, Egypt: A post-arc collision low-angle normal ductile shear zone

Fowler

Osman

2009

Journal of African Earth Sciences

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Section: Central Eastern Desert Low-grade Metamorphicssupporting

confidence: 85%

“…Still later upright folds with NW-SE trends are here called F3 folds. Essentially the same terminology for the Migif-Hafafit gneisses was adopted by Abdel-Khalek and Abdel-Wahed (1983).…”

Section: Migif-hafafit Gneisses (South Eastern Desert)mentioning

confidence: 99%

The Sha’it–Nugrus shear zone separating Central and South Eastern Deserts, Egypt: A post-arc collision low-angle normal ductile shear zone

Fowler

Osman

2009

Journal of African Earth Sciences

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“…1990, 1994) (hereafter referred to as Juvenile Shield Model) or (ii) the infrastructural rocks are parts of pre‐Neoproterozoic continental crust overthrust by juvenile Pan–African supracrustal rocks (e.g. Abdel‐Khalek & Abdel‐Wahed 1983; El‐Gaby 1983; Habib et al . 1985; El‐Gaby et al .…”

Section: Discussionmentioning

confidence: 99%

“…These authors therefore envisage the ANS as formed of several late Neoproterozoic ensimatic island arcs accreted to the passive continental margin of the East Sahara craton west of the Nile River (Kröner 1979) (Island Arc Model). Other authors (e.g Abdel‐Khalek & Abdel‐Wahed 1983El‐Gaby et al .…”

Section: Introductionmentioning

confidence: 99%

Sr–Nd isotopes and geochemistry of the infrastructural rocks in the Meatiq and Hafafit core complexes, Eastern Desert, Egypt: Evidence for involvement of pre‐Neoproterozoic crust in the growth of Arabian–Nubian Shield

et al. 2007

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Meatiq and Hafafit core complexes are large swells in the Eastern Desert of Egypt, comprising two major tectono-stratigraphic units or tiers. The lower (infrastructure) unit is composed of variably cataclased gneissose granites and high-grade gneisses and schists. It is structurally overlain by Pan-African ophiolitic mélange nappes (the higher unit). The two units are separated by a low-angle sole thrust, along which mylonites are developed. Major and trace element data indicate formation of the gneissose granites in both volcanic arc and within-plate settings. Nevertheless, all analyzed gneissose granites and other infrastructural rocks, exhibit low initial ratios (Sr i ) (<0.7027), positive e Nd (t) (+4.9 to +10.3) and Neoproterozoic Nd model age (T DM ) (592-831 Ma for the gneissose granite samples). Although these values are compatible with other parts of the Arabian-Nubian Shield considered to be juvenile, the e Nd (t) values and several incompatible element ratios of the gneissose granites are too low to be derived from a mantle source without contribution from an older continental crust. Our geological, Sr-Nd isotopic and chemical data combined with the published zircon ages indicate the existence of a pre-Neoproterozoic continent in the Eastern Desert that started to break up at ca 800 Ma. Rifting and subsequent events caused the formation of oceanic crust and emplacement within-plate alkali basalts in the hinterland domains of the old continent. The emplacement of basaltic magma might have triggered melting of lower crust in the old continent and resulted in emplacement of the within-plate granite masses between 700 Ma and 626 Ma. The granite masses and other rocks in the old continent have been subjected to deformation during the over-thrusting of Pan-African nappes, probably because of the oblique convergence between East and West Gondwanaland. Rb-Sr isotopes of the gneissose granites in both Meatiq and Hafafit core complexes defines an isochron age of 619 Ϯ 25 Ma with Sr i of 0.7009 Ϯ 0.0017 and mean squares of weighted deviates = 2.0. We interpret this age as the date of thrusting of the Pan-African nappes in the Eastern Desert. Continued oblique convergence between East and West Gondwanaland could have resulted in the formation northwest-southeast-trending Meatiq and Hafafit anticlinoriums.

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“…Garson and Krs (1976) considered that Wadi Shait thrust lies within the range of the regional N45º-60ºE block faulting and should be older than the Wadi Nugrus thrust, which lies within the range of deepseated tectonic zones N 30º-35º W. Abdel Khalek (1979) recorded the possibility that the two thrusts are contemporaneous and represent one thrust line curved in NW direction. Abdel Khalek and Abdel Wahed (1984) recorded three deformational phases d1, d2 and d3. The first deformational phase (d1) is represented by NW-SE axial planes and axes plunging SE and NW respectively.…”

Section: Introductionmentioning

confidence: 99%

Polyphase Folding in Nugrus-Sikeit Area South Eastern Desert, Egypt

Assaf¹,

Ibrahim²,

Zalata³

et al. 2000

ear

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The lithological constitution of Nugrus-Sikeit area comprises a sequence of dismembered ophiolites, tectonic mélange association and arc assemblage. These older rocks are intensively deformed and intruded by intracratonic association, which within the mapped area, is represented by gabbros and the associated hornblendite together with younger granites. Planar and linear mesoscopic structures exhibited by the rocks of Nugrus-Sikeit area indicate that these rocks are involved in superimposed folding events and at least three fold generations (F1, F2 & F3) can be recognized.

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Structural setting of the Hafafit Gneisses Eastern Desert, Egypt

Cited by 6 publications

References 0 publications

The Sha’it–Nugrus shear zone separating Central and South Eastern Deserts, Egypt: A post-arc collision low-angle normal ductile shear zone

The Sha’it–Nugrus shear zone separating Central and South Eastern Deserts, Egypt: A post-arc collision low-angle normal ductile shear zone

Sr–Nd isotopes and geochemistry of the infrastructural rocks in the Meatiq and Hafafit core complexes, Eastern Desert, Egypt: Evidence for involvement of pre‐Neoproterozoic crust in the growth of Arabian–Nubian Shield

Polyphase Folding in Nugrus-Sikeit Area South Eastern Desert, Egypt

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