Mineralogical composition of the clay fraction, in relation to lithology, topography and depositional environments in the northern coastal zone of the Nile delta [electronic resource].

Includes references.

Seven soil profiles representing four geomorphological units alluvial deposits, fluvio locustrine deposits, coastal barrier plains and coastal sand dunes were selected morphologically described and subjected to mineralogical analysis of the clay fractions, in relation to lithology, topography and depositional environments in the northerneoastal !zone of the Nile delta. The results of the research can be summarized as follows: I. Soil salinity (EC): between 0.9and 60.4 ds/m and it was very high in the coastal barrier plains. 2. The cotion exchange capacity (CEC) varied between 2 and 40 meq/100 g soils, it indicated a high rate in the alluvial deposits land and a lowest rate in the costal sand dunes. 3. Total CaC03: between 0.8 and 20.1%, the highest increase was in the costal barrier plains. 4. Soil texture: according to the accurate study for the fraction composition; the soil texture in the studied area is generally sand to clay. 5. The mineralogical composition of the clay fraction: The analysis by x-ray showed that tbere is some similarity in the mineralogical composition of the clay where the montomori1I0nite, kaolinite, hydrousmica, virmiculite were the dominate minerals in addition to some qurtiz, fildishar, palygorskite and calcite.

Summary in Arabic.

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