The Migif–Hafafit gneissic complex of the Egyptian Eastern Desert: fold interference patterns involving multiply deformed sheath folds

Microstructural finite strain analysis of the Hafafit granitoids domes South Central Eastern desert of Egypt

“…Published structural data in WHC (e.g. Greiling et al, 1988b;Fritz et al, 1996;Fowler and El Kalioubi, 2002;El Naby et al, 2008;Fowler and Osman, 2009;Shalaby, 2010) elucidate:…”

“…2. Dome B &C shows constriction strain becouse more complex patterns of superimposed interference folds and sheared with Shait-Nugrus Shear zone (SNSZ) (Fowler and El Kalioubi, 2002). 3.…”

“…HaFafit, Sibai and Meatiq domal structures; Wallbrecher et al, 1993;Fritz et al, 1996Fritz et al, , 2002Bregar et al, 2002;Loizenbauer et al, 2001;Abdel Wahed, 2008;Khudeir et al, 2008), (3) emplacement within regional domal structures (Ibrahim and Cosgrove, 2001) followed by extension parallel to their fold axes (e.g. Sibai dome, Fowler et al, 2007), and (4) interpreted the WHC as a result of fold interference patterns involving multiply deformed sheath folds (Fowler and El Kalioubi, 2002). The domal structure (WHC) represents the largest antiformal structures in the Nubian Shield.…”

“…El Bahariya and Abd El Wahed (2003) considered the granitoid cores together with the genetically related foliated metagabbro to represent the oldest rocks in the Hafafit area. The tectonic evolution of the WHC has been interpreted as a result of fold interference paterns involving multiply deformed sheath folds (Fowler and El Kalioubi, 2002) or as aconsequence of tectono-magmatic and tectono-metamorphic processes in an active continental margin tectonic setting (El Bahariya and Abd El Wahed, 2003). The P-T conditions for the different mineral assemblages in order to place some constraints on the petrogenesis of the migmatitic rock association as well as the tectonic processes which accompanied metamorphism and orogenesis (El Bahariya, 2008).…”

U–Pb ID-TIMS dating of igneous and metaigneous rocks from the El-Sibai area: time constraints on the tectonic evolution of the Central Eastern Desert, Egypt

“…Greiling et al (1988) related formation of the Megif-Hafafit domal structure ( Fig. 1) to fault-bend folding, whereas Fowler and El Kalioubi (2002) favoured a model involving refolding of sheath folds to explain the appearance of 5 or 6 subdomes in the area. Diapiric rise of late orogenic magmas is a third model which has been proposed to explain the Meatiq and El-Sibai gneissic complexes (Fritz and Messner 1999;Loizenbauer et al 2001;Neumayr et al 1998).…”