- Emeritus Professor in geology, sedimentary rocks andvl sedimentation specialist, geology Department, Cairo University, Egypt.edit
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At the top of Gebel Khoshera, the Middle Miocene gypsum is represented mainly by giant swallowtail twinned crystals, up to 2 meters in length, and Sabre-like crystals. Usually, the normal growth of these crystals forms thick flat lying... more
At the top of Gebel Khoshera, the Middle Miocene gypsum is represented mainly by giant swallowtail twinned crystals, up to 2 meters in length, and Sabre-like crystals. Usually, the normal growth of these crystals forms thick flat lying crusts on the sediment floor. During submergence period, these crystals are usually aggregated on the bottom of the evaporite basin, in competition for free space, to form gypsum domes with variable size and dimensions. During emergence period of the subaqueous twinned gypsum, the crusts and domes are cracked into tepee polygonal structure indicating sabkhatization of the originally sub-aqueous gypsum crystals. Primary fluid inclusions data in selenite crystals are used to interpret depositional settings and parent water chemistry. The final melting temperature of ice in fluid inclusions falls between -6.2 °C and -8.6 °C. The existence of fluid inclusions with melting temperatures below -7.0%', indicate that the gypsum formed from simple evaporati...
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The main constraints for sustainable agricultural development in Sinai are essentially the migration of sand dunes that occupy about 5000 Km2 of the coastal zone. This adversely affects the cultivated lands and the newlyreclaimed areas.... more
The main constraints for sustainable agricultural development in Sinai are essentially the migration of sand dunes that occupy about 5000 Km2 of the coastal zone. This adversely affects the cultivated lands and the newlyreclaimed areas. The study area is located at the NW corner of Sinai Peninsula and it .is subjected to sand duneencroachment. Movement of sand dunes causes severe damage to the human settlements, roads, irrigation anddrainage constructions. Migration of aeolian sands results in the migration of longitudinal dunes at a rate of 2.25 m/y for those south of Bir El Abd and 13 m/y at Wadi El Gady. The rate of barchan dunes movement at Wadi El Massaged is 3.5 m/y. Also, a lateral movement of the segments of longitudinal dunes is recorded south of Bir El Abd and at Wadi El Gady. The morphodynamic model of the longitudinal dunes shows that deposition (percent) on the longitudinal dunes south of Bir El Abd is low relative to erosion. However, deposition on the longitudinal dun...
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Continental sabkha is recorded in the extreme middle part of the southWestern Desert of Egypt representing one of the most promising areas for sustainable development, especially for agriculture. The geomorphologic units of the area are... more
Continental sabkha is recorded in the extreme middle
part of the southWestern Desert of Egypt representing one
of the most promising areas for sustainable development, especially
for agriculture. The geomorphologic units of the area
are formed under the influence of structural, lithological, and/
or climatic controls. These units include pediplain, depressions,
mass-wasted blocks, residual hills, drainage lines, and
aeolian landforms. The effective deflation process is reinforced
by the lack of protective vegetation cover and the susceptibility
of weakly consolidated rocks to wind removal. Different
rock units covering the area range in age from Early
Cretaceous to Quaternary. Quaternary deposits include playa/
sabkha deposits where the continental sabkha is divided into
four zones A, B, C, and D. Underground waters coming from
the north and east were progressively enriched in solute by
interaction with the surrounding sedimentary and igneous
rocks. Most of the evaporite minerals grow displacively as a
result of evaporative pumping. Mineralogically, the continental
sabkha salt complex includes gypsum, natroalunite,
tamarugite, bloedite, eugsterite, nitratine, halite, and D’ansite.
Some of the major and trace elements (SiO2, Al2O3, Fe2O3,
MgO, CaO, Na2O, K2O, as well as Rb, Ba, Zr, Sr, Y, V, and
Zn) were measured. The correlation and enrichment of these
major and trace elements indicate the origin of the salt complex
in the sabkha.
part of the southWestern Desert of Egypt representing one
of the most promising areas for sustainable development, especially
for agriculture. The geomorphologic units of the area
are formed under the influence of structural, lithological, and/
or climatic controls. These units include pediplain, depressions,
mass-wasted blocks, residual hills, drainage lines, and
aeolian landforms. The effective deflation process is reinforced
by the lack of protective vegetation cover and the susceptibility
of weakly consolidated rocks to wind removal. Different
rock units covering the area range in age from Early
Cretaceous to Quaternary. Quaternary deposits include playa/
sabkha deposits where the continental sabkha is divided into
four zones A, B, C, and D. Underground waters coming from
the north and east were progressively enriched in solute by
interaction with the surrounding sedimentary and igneous
rocks. Most of the evaporite minerals grow displacively as a
result of evaporative pumping. Mineralogically, the continental
sabkha salt complex includes gypsum, natroalunite,
tamarugite, bloedite, eugsterite, nitratine, halite, and D’ansite.
Some of the major and trace elements (SiO2, Al2O3, Fe2O3,
MgO, CaO, Na2O, K2O, as well as Rb, Ba, Zr, Sr, Y, V, and
Zn) were measured. The correlation and enrichment of these
major and trace elements indicate the origin of the salt complex
in the sabkha.
Research Interests:
Middle Miocene gypsum on the eastern coast of the Gulf of Suez, west-central Sinai, Includes massive and bedded selenite. These selenites are interpreted as primary deposits because their textures and fabrics such as vertically oriented... more
Middle Miocene gypsum on the eastern coast of the Gulf of Suez, west-central Sinai, Includes massive and bedded selenite. These selenites are interpreted as primary deposits because their textures and fabrics such as vertically oriented crystals