Formation of Neoproterozoic metamorphic complex during oblique convergence (Eastern Desert, Egypt)

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

“…These shear zones define together the boundaries of the gneiss complex. Based on these postulated shear zones, they explained the gneiss complex as an exhumed gneiss dome resulting from orogen-parallel (NW-SE) extension caused by oblique collision, similar to the model proposed for the Meatiq gneiss dome (Abd Ell Wahed 2008;Fritz et al 1996Fritz et al , 2002Walbrecher et al 1993). Fowler et al (2007) rejected the existence of the so-called external strike-slip shear zones crucial to the exhumation model by Bregar et al (2002) and Fritz et al (2002) and explained the appearance of the El-Sibai gneisses as the result of synmagmatic deformation of tabular granitoid bodies contemporaneous with NW thrusting and nappe stacking.…”

“…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). Another group of authors explain the gneiss complexes as a result of orogen-parallel extension caused by oblique collision (Abd Ell Wahed 2008;Bregar et al 2002;Fritz et al 1996Fritz et al , 2002Walbrecher et al 1993).…”

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:…”

“…Several models have been postulated to explain the WHC four tectonic models were proposed to decipher their origin: (1) development of fault-bend fold "antiformal stacks" (e.g.Hafafit domal structure; Greiling et al,1988a), (2) orogen-parallel crustal extension (e.g. 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).…”

Lamprophyres from Abu Rusheid-Sikait Area, South Eastern Desert, Egypt: Rare Earth Elements, Mineralization and Spectrometric Prospecting

“…The TM image of band ratios covers a major part of study area ( Fig.1) was used in regional interpretation for general rock types identification and association. Abu Rusheid-Sikait area is bordering to the major shear zone known as the Nugrus thrust fault (Saleh, 1997, Greiling et al, 1988 or the Nugrus strike-slip fault (Fritz et al, 1996) and or Ras Shait-Nugrus shear zone (Fowler and Osman, 2009). This shear zone separates hightemperature metamorphic rocks of the Hafafit complex in the SW from mainly low-grade ophiolitic and arc volcanic assemblages known as Ghadir group to the NE.…”