Mapping and structural analysis of the area around G. Urarn Ginud, in the South Eastern Desert, have shown that the area is occupied by: (a) old continental rocks including gneisses, migmatites and amphibolites, (b) arc intermediate metavolcanics, (c) intrusive metagabbros, (d) intrusive diorite-tonalite-granodiorite association, and (e) intrusive young gabbros.
The structural analysis of major,
... [Show full abstract] minor and micro structures indicated that the area has tectonically evolved through three phases of deformation DI, D2 and D3. The first phase (D1) is represented by SI penetrative foliation parallel to So banding planes (S1/S0), LI lineation, F1 folds and initial thrust. F1 folds include asymmetric, intrafolial, chevron and recumbent minor folds as well as a major doubly plunging anticline and an overturned syncline. They trend NW-SE and plunge to NW and in places SE. The NW-SE faults are of strike-slip and normal character. They run parallel to F1 axes of folds. D2 is contemporaneous with DI and represented by S2 foliation, L2 lineation and F2 asymmetric and tight folds. The axial traces of F2 folds trend WNW-ESE and plunge at moderate angles to WNW. The D2 Faults are mainly of strike-slip nature. S3 foliation, L3 lineation and F3 open folds represent the third phase D3. The axial planes of F3 folds trend NE-SW and plunge to SW. The NE-SW fault traces are the youngest and dislocate NW-SE and WNW-ESE faults. These three events of deformation represent two phases of compressive stress. The first acted from NE to ENE directions and was accompanied by strong shortening in a direction perpendicular to the axes of F1 and F2 folds. The second phase of compression was weak stress acted from NW direction and was accompanied by local shortening in the NW-SE direction.