SEDIMENTOLOGICAL, MINERALOGICAL AND GEOCHEMICAL STUDIES ON SOME RECENT KHORS SEDIMENTS, LAKE NASSER, EGYPT

Sixty-six bottom samples were collected from Khor El-Ramla, Khor Kalab sha, Khor Wadi-Abyad and Khor Allaqi of Lake Nasser. Variations in the ir grain-size parameters are attributed to the characteristics of die surrounding Precambrian basement rocks and Upper Cretaceous Nubia Sand stone. The quartz surface texture reflects fingerprints of the origina l aeolian environment of some grains in spite of die diagenesis effect . The heavy mineral suite illustrates die prime control of provenance. The clay fraction is composed mainly of kaolinite and smectite. Illit e occurs in traceable amounts. Their distributions suggest a detrital origin. Geochemical analysis of die clay fraction for SiO2, Al2O3, Fe2 O3, CaO, MgO, K2O, Ni, Cu, Pb and Mn content was carried out.