Najd Shear System in the Arabian-Nubian Shield

Structural and tectonic evolution of suture‐related belts and post‐accretionary systems in the Arabian‐Nubian Shield

“…NFS is regarded as one of the longest Neoproterozoic shear zone systems on Earth. NFS is evolved between 540 and 620 Ma and consists of a composite group of NW–SE striking sinistral strike‐slip faults and ductile shear zones in the Arabian‐Nubian shield (Abd El‐Wahed et al, 2010, 2016, 2021; Abd El‐Wahed & Attia, 2022; Abd El‐Wahed & Hamimi, 2020, 2021a, 2021b; Agar, 1987; Berhe, 1990; Davies, 1984; Fritz et al, 2013; Hamimi & Abd El‐Wahed, 2020; Hamimi & Fowler, 2021; Johnson et al, 2011; Kassem et al, 2022; Moore, 1979; Stern, 1985; Sultan et al, 1988). The NFS is up to 400 km broad and 1100 km long, with inferred subsurface expansions of the Najd giving it a total length of 2000 km (Moore, 1979).…”

“…The NFS plays a major role in the genesis and exhumation of gneiss‐cored domes and Hammamat molasse deposits (Figures 17) in the Nubian Shield (Abd El‐Wahed, 2008; Abd El‐Wahed et al, 2021; Abd El‐Wahed & Attia, 2022; Abd El‐Wahed & Hamimi, 2020; Abd El‐Wahed & Kamh, 2010; Abd El‐Wahed, Kamh, et al, 2019; Abd El‐Wahed, Lebda, et al, 2019; Abu‐Alam & Stüwe, 2009; Andresen et al, 2010; Fritz et al, 1996; Hamimi & Fowler, 2021; Hassan et al, 2016; Johnson et al, 2011; Kassem et al, 2022; Makroum, 2017; Shalaby, 2010; Stern, 2018). The preponderance of a NW‐trending tectonic fabric marks the NW–SE sinistral shear zone of the NFS in CED and the northern parts of the SED (Abd El‐Wahed et al, 2021; Abd El‐Wahed & Kamh, 2010; Abd El‐Wahed & Thabet, 2017; Fritz et al, 1996, 2002; Hamdy et al, 2017; Hamimi & Abd El‐Wahed, 2020; Makroum, 2017).…”

“…Other extensive structural studies in the CED of Egypt showed temporal correlations between periods of Pan‐African folding and thrusting and subsequent Najd wrench faulting (Abdeen & Greiling, 2005; Fowler & El‐Kalioubi, 2004; Fritz et al, 1996; Greiling et al, 1994; Hamdy et al, 2017). Many workers suggested that D2 deformation event in the central part of the Egyptian Nubian Shield was linked with lateral extension and Oblique convergence transpression and was followed by exhumation of core complexes in orogen parallel extension around 620–580 Ma (Abd El‐Wahed, 2008; Abd El‐Wahed & Attia, 2022; Abd El‐Wahed & Hamimi, 2020, 2021a, 2021b; Abd El‐Wahed, Kamh, et al, 2019; Abd El‐Wahed, Lebda, et al, 2019; Bregar et al, 2002; Fritz et al, 1996, 2002; Hamimi & Abd El‐Wahed, 2020; Hamimi et al, 2019; Hamimi & Fowler, 2021; Kassem et al, 2022; Loizenbauer et al, 2001; Makroum, 2017; Shalaby et al, 2005; Zoheir, Abd El‐Wahed, et al, 2019; Zoheir, Emam, et al, 2019).…”

Rodinia to Gondwana evolution record, South Sinai, Egypt: Geological and geochronological constraints

“…The second peak of zircon ages ranges from 850 to 700 Ma, with an average age of 750 Ma. This age population may reflect arc-arc convergence and terrane suturing, marking the beginning of oceanbasin closure and Gondwana assembly (Fritz et al, 2013;Abu-Alam et al, 2014;Hamimi et al, 2021). Similar ages were recorded in Sinai, such as 844 ± 4 Ma, from Moneiga quartz-diorites (Bea et al, 2009), 819 Ma of quartz monzonitic gneiss from Saal Metamorphic Complex (Be'eri-Shlevin et al, 2012), 792 ± 7 Ma of the foliated biotite-gneiss in the western margin of the Solaf zone (Abu El-Enen and Whitehouse, 2013), 782 ± 7 Ma reported from a slightly foliated granodiorite (Stern and Manton, 1987), 802 ± 6 Ma of quartz diorite and 785 ± 7 Ma of tonalitic gneiss of the Feiran-Solaf Metamorphic Complex (Eyal et al, 2014), 777 ± 4 Ma of Qenaia gneisses (Kid Metamorphic Complex) and 737 ± 9 Ma of Taba granitic gneiss (Kolodner, 2007).…”

Multisensor Satellite Data and Field Studies for Unravelling the Structural Evolution and Gold Metallogeny of the Gerf Ophiolitic Nappe, Eastern Desert, Egypt

“…On the other hand, the SED has a higher proportion of gneisses [14] than the CED, as well as ophiolitic meta-ultramafites that are exposed tectonically as emplaced nappes. While fold-related faults generally associated with pull-apart basins related to the Najd Fault System predominate in the CED, fold-thrust belts in the SED are first-order kinematics that were later overprinted by regional-scale transpression [13,[18][19][20][21][22][23]. Compared to the CED, the SED appears to represent a deeper amount of exposure and is less impacted by the Najd shearing [24].…”