| Description |
xi, 88 leaves : color illustrations, maps ; 29 cm |
| Summary |
"This work uses field and remote sensing studies to examine structural controls of the Egyptian Nile between Aswan and Kom Ombo (referred here to as AKN). This segment of the Egyptian Nile incises through Cretaceous Nubian sandstone and Precambrian crystalline rocks separated by a shallowly-dipping to theN unconformity. It was only 0.8 Ma that the Egyptian Nile connected to the rest of the sub-Sahara Africa drainage system. Prior to this time, the Egyptian Nile evolved independently through 8 phases: Pre-Eonile (<6 Ma), Eonile (6.0-5. 4 Ma), Gulf Phase (5.4-3.3 Ma), Paleonile Phase (3.3-1.8 Ma), Desert Phase (1.8-0.8 Ma), Prenile Phase (0.8-0.4 Ma), Neonile Phase (0.4 Ma-12 ka) and Modem Nile (12 ka-Present). Results of this work show the following: (1) The AKN region is dominated by N, NE, E, and NW-trending fractures. (2) The pre-Eonile phase is represented by a W (Wadi Abu Subbaira E of the Nile) and a NW-flowing drainage system (Wadi Kubbania W of the Nile). The Wadi Kubbania is controlled by a ̃4 km wide, ̃150m deep NW-trending graben. (3) The course of the AKN can be approximated by ̃10 km long right-stepping segments controlled by discrete NNW and NE-trending fractures. (4) South of the unconformity between the Precambrian crystalline rocks and the Cretaceous Nubian sandstone, the river incised through the entire Cretaceous Nubian sandstone section to expose the Precambrian crystalline rocks. Here the AKN follows many fracture-controlled courses forming the first cataract. (5) The Eonile and Gulf Phases did not extend southward to reach Aswan since the Precambrian crystalline rocks are exposed there. (6) The AKN evolution has been influenced by the Red Sea and the Nubian Swell regional tectonics but local structures have also played an important role in its evolution"--Abstract, leaf iv. |
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