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6946129 
Journal Article 
Geology and mapping of laterites, South Eastern Desert, Egypt: Based on field and ASTER data approach 
El Desoky, HM; Shahin, TM; , 
2020 
Yes 
Geological Journal
ISSN: 0072-1050 
WILEY 
HOBOKEN 
55 
6 
4252-4264 
WOS:000494680600001 
The area between wadi Dungash-wadi Shait in the South Eastern Desert of Egypt comprises ophiolitic nappes structurally overthrust on island arc-related metasedimentary-metavolcanic rocks, which are traversed by several granitoids, gabbroic and basaltic rocks. This paper focuses on uncovering laterite zones utilizing field geological, mineralogical and geochemical attributes of the investigation region. Laterites are distributed at the border between Neoproterozoic and Phanerozoic rocks. The laterite deposits are developed after the emplacement of Natash flows as a result of lateritization process in tropical regions, during the Late Cretaceous. The laterite sections comprise a sequence from the top to the base, oxide laterite, plasmic laterite, saprolith and bedrock. The laterite sections consist of hematite and goethite together with small quantity of gibbsite. Geochemically, the laterite profiles are marked by an increase in Fe content and decrease in Si from the top to the bottom. Fe2O3 is the most abundant with 30.09-54.67 wt.%, Al2O3 vary from 18.01 to 32.78 wt.%, and SiO2 vary from 15.05 to 19.43 wt.%. Advanced Spaceborne Thermal Emission and Reflection Radiometer images are utilised to characterize a primer laterite zone. The band ratio 4/5 is found to be efficient in defining the laterite soil in the studied area. 
Arabian-Nubian Shield; ASTER; Egypt; laterite; regolith; wadi Dungash-wadi Shait