Geological studies of the coastal area between Mersa um Gheig and Ras Banas , RedSea coast, Egypt

摘要

Egypt's Red Sea coast runs from the Gulf of Suez to the Sudanese border. The length of the study area between Mersa um Gheig and Ras Banas is about 240 km. The main geomorphological unit in the study area includes mountains (basement), shoreline, beach, alluvial fan, and flood plain. The study area studied by tow methods: 1- sedimentological and mineralogical (Geologic) methods 2- remote sensing methods. The geologic method give a light picture about the composition of the beach, where the beach sediments range from calcareous sand in the north of the study area (Mersa um Gheig, the sand percent 86.83%) to carbonate beach in the south of the study area (Ras Banas, the carbonate percent 96.78%). Also the heavy minerals in the beach sand studied in fine (0.250-0.125mm) and very fine(0.125 – 0.063mm) fractions (average percentages of two fractions) to shed more light on the nature of the source rocks and their sedimentary history. Opaques and non Opaques (Amphibole, Epidote, staurolite, Zircon, Muscovite, Chlorite, Garnet, Rutile) are studied in detail as averages in both fine and very fine fractions. The heavy metals (elements) in the study area estimated and interpreted, where, Ba range from 10.1 to 315 ppm, Sr range from 548 to 2800 ppm, Cr range from 0.0 to 250 ppm, , Ni range from 0.0 to 103ppm, Cu from 10 to 35ppm, Zn from 0.0 to 94 ppm, Sc from 0.0 to 17.6 ppm, V from 0.0 to 277 ppm, Y from 0.0 to 9ppm, and Mo from 2 to 16 ppm. The remote sensing method also used in this area for study the sedimentation changes in many selected sites. Finally the purpose of this study is determination the geological and environmental properties of each beach in the selected sites and the suitable of each site for different sustainable development activities.