Horizontal cleavage in southeastern Sinai: the case for a coaxial strain history

Neoproterozoic structural evolution of SE Sinai, Egypt: I. Re-investigation of the structures and deformation kinematics of the Um Zariq and Malhaq Formations, northern Wadi Kid area

“…There is general agreement about the age of the D2 event dated between 620 and 600 Ma (Halpern and Tristan, 1981;Shimron, 1984bShimron, , 1985Shimron, , 1987Reymer and Oertel, 1985;Blasband et al, 1997).…”

“…7a). Most examples in the Um Zariq Formation appear to be approximately symmetrical and form cascades of folds as noted by Reymer and Oertel (1985), however, in the Malhaq Formation they are commonly asymmetrical. The hinges of the folds have quite variable trends though very gentle plunges (Fig.…”

“…D1 is broadly accepted as an upright tight to isoclinal macroscopic folding that generated rare F1 mesoscopic folds, and a subvertical S1 axial plane foliation. The age of the D1 event has been estimated as 640 Ma (Shimron, 1984b), 750-600 Ma (Reymer and Oertel, 1985), narrowed to 720-650 Ma by Blasband et al (2000).…”

Geochemistry and metamorphism of the Pan-African back-arc Malhaq volcano-sedimentary Neoproterozoic association, W. Kid area, SE Sinai, Egypt

“…For the Sinai Peninsula metamorphic complexes, the Pan-African metamorphic event has been explained variably with crustal thickening model (El-Bayoumi et al, 2006), heat flux due to the presence of an active magmatic arc that formed on top of subducting young lithosphere (Abu , and/or crustal extension above a forcefully intruding diapiric pluton (Reymer and Oretel, 1985;El-Gaby et al, 1991;Blasband et al, 1997Blasband et al, , 2000Brooijmans et al, 2003).…”

“…Disagreements exist on the natures and kinematics of second and later deformation phases. Reymer and Oretel (1985) explained the generation of the subhorizontal cleavage in the KMC, related to D 2 phase, to have formed by protracted irrotational extension above a forcefully intruding diapiric pluton. Blasband et al (1997Blasband et al ( , 2000 interpreted the subhorizontal mylonitic foliations and well-developed NW-SE lineation related to D 2 as result of NE-SW extensional collapse of the KMC, thus leading to crustal thinning and isostatic rise of Kid core complex.…”