By Helga Besler, A. Bolten, O. Bubenzer, A. Hilgers and A.J. Van Loon (Eds.)
The good Sand Sea in Egypt offers the background of 1 of the big sand seas within the Sahara, starting with the sand provide via fluvial shipping from in part far away components and likewise by means of neighborhood sandstone weathering. It additionally info sand as provider of data and exhibits the probabilities of sedimentary research in facing this type of subject. easy measurements may provide very important info (e.g. salinity measurements). renowned tools will be constructed additional to reply to detailed questions. A wealth of data should be drawn from particularly tailored sedimentological investigations. finally, bits of knowledge from various analytical assets may be prepare to bare the heritage of a giant sand sea. *Analyzes various geological assets to decipher the historical past of the nice Sand Sea*Presents the chances of sedimentary research to interpret the heritage of an area*Develops recognized the right way to additional solution distinctive questions
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Extra info for The Great Sand Sea in Egypt: Formation, Dynamics and Environmental Change – A Sediment-Analytical Approach
Not the presence of specific salts in the sands is of importance, but only the question whether a sand is saline or not. Moreover, salinity is not used in a hydrological or pedological sense. The salinity of the sediments is interesting only as an indicator of more humid conditions of the past. The specific definition and the effective classification of salinity used here were developed during the study of the Namib Erg in Namibia (Besler, 1979, 1980; Besler and Gut, 1997). It allows the distinction between dune sands (not saline: <102 mS/cm), megadune sands (saline: >102 mS/cm), aeolian sediments subjected to surface-water infiltration and evaporation during longer time-spans (strongly saline: >103 mS/cm) and littoral sands influenced by sea water (extremely saline: >104 ms/cm).
The ASTER drainage lines show more detail, because of their higher resolution. This means that the drainage-line algorithm for both elevation models uses the same number of flow-accumulation data at the calculation starting point. In conclusion, both models give a coherent view of the relief situation. Due to the fact that no-data regions or regions with a low quality of elevation data still exist in the SRTM-3 data, a solution to get a uniform database for modelling has to be found. Figure 6(a) shows no-data regions of the SRTM-3 data located mostly in the sand-covered regions of the Great Sand Sea, and the position of available ASTER scenes.
The stratigraphic record comprises 11 layers of calcareous playa material and intercalated aeolian sands. Twenty-four samples for sedimentary analysis and 12 samples for OSL dating were collected. The surrounding sediments are exceedingly red. Pieces of desert glass were found below the megadune sands, and exposed pieces were more sand-blasted than the Acheulean artefacts (Haynes, 1982). Pachur and Altmann (2006) mention playa deposits and intercalated dune sands also in the southern sand sea north of the Gilf Kebir Plateau.