Geological Survey of Egypt

Cairo, Egypt

Geological Survey of Egypt

Cairo, Egypt
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Boukhary M.,Ain Shams University | Amin Bassiouni M.E.,Ain Shams University | Issawi B.,Geological Survey of Egypt | Sharabi S.,GEOCOMP | Mansour H.,Ganoub El Wadi Holding Petroleum Company
Micropaleontology | Year: 2013

The present work dealswith the stratigraphy, lithological characteristics, planktonic foraminiferal zonation and the ostracods of the Upper Cretaceous (Maastrichtian) - Paleocene rocks in the Kharga Oasis and the lower paleogene of Gebel Dandara section, Nile Valley, Egypt. The planktonic foraminifera and ostracods were obtained from twostratigraphic sections:Ain Dabadib and N. AinAmurfrom the area NorthWest of the Kharga Oasis, Egypt. Thirty seven planktonic foraminiferal and twelve ostracod species were identified, among the latter, 1 genus: Aegyptoleberis Boukhary,Bassiouni and Sharabi n.gen. (Type species: Cythereis coronata Esker 1968) and 2 species: Cytheropteron dakhlaensis Boukhary and Bassiouni n.sp., and Ordonyia dabadibensis Boukhary and Sharabi n. sp., from the Late Paleocene are believed to be new.Among the association, there are species which are identical with those described from Tunisia by Esker (1968) and Said (1978) and from Jordan by BASSIOUNI(1971).The planktonic foraminiferawere used for the biostratigraphic control. Future studiesmayprove these ostracod assemblages to be of index value and valid for the Mesogean Paleocene in the neritic provinces in North Africa and Middle East.

Helmy H.M.,Minia University | Shalaby I.M.,Geological Survey of Egypt | Abdel Rahman H.B.,Geological Survey of Egypt
Journal of African Earth Sciences | Year: 2014

A Precambrian skarn-type mineralization is recently discovered in the Wadi Kid area in southeast Sinai, Egypt. Two sulfide ore types define large scale metal zoning; Cu-Zn-Co in calc-silicate rocks and Zn-Pb-As-Ag in metapelites. The sulfides and host rocks underwent amphibolite facies metamorphism (2.1-4.2. kbar and 500-620. °C). Dating by the chemical Th-U-total Pb isochrone method yields an Th-Pb isochrone age of 660 ± 25 Ma for metamorphic monazite from metapelites. Overall structural and textural relationships of silicate and sulfide minerals favor syn-tectonic formation during granitoids emplacement in a continental margin setting. Large-scale metal zoning reflects variable distances from the causative pluton(s). The Wadi Kid area is highly prospective for Cu, Zn, Pb and Ag mineralization. © 2013 Elsevier Ltd.

Madkour H.A.,National Institute of Oceanography and Fisheries of Egypt | Mansour A.M.,South Valley University | Ahmed A.E.-H.N.,Geological Survey of Egypt | El-Taher A.,Al Azher University
Arabian Journal of Geosciences | Year: 2014

The textural and geochemical aspects of the sediments of subtropical mangrove ecosystem and surrounding areas have been studied and discussed. Forty sediment samples were collected from different areas of mangrove environment and surrounding areas along the Egyptian Red Sea coast. The sediments of each study areas are characterized by the abundance of sand with minor amounts of mud and gravel. The mean size of the sediments ranged from medium grained to fine grained at the study areas. Cluster analysis showed that the distribution of gravel, sand, and mud fractions is related to bottom facies and type of sediment source. Generally, sand fraction is the main category among the three constituents. Carbonate content recorded minor values in the study areas. The CaCo3content of the sediments ranged from 4.7 % at Hamata area to 64.9 % at Erier area. Terrigenous and biogenic components are the factor controlling of the carbonate content of studies sediments. The organic carbon content ranged from 1.10 at Hamata area to 3.1 % at Sharm el-Qibli and Erier areas, which is controlled by particle size of the sediments. Phosphorus content in the different studied localities is related to the sources of phosphorus to the area. Our observations provide evidence that there are no significant differences in environmental texture and geochemistry of the sediments of subtropical mangrove ecosystem and surrounding areas of the Egyptian Red Sea coast. © Saudi Society for Geosciences 2013.

Madkour H.A.,National Institute of Oceanography and Fisheries of Egypt | Abdelhalim M.A.K.,King Saud University | Obirikorang K.A.,University of Ghana | Mohamed A.W.,National Institute of Oceanography and Fisheries of Egypt | And 3 more authors.
Journal of Environmental Biology | Year: 2015

Several investigations including nature and geochemistry of surface sediments were carried out on forty-two sediment samples collected from Abu-Shaar, Abu-Galwa, Umm al-Huwayta¯t and Marsa Shuni lagoons located along with the Egyptian Red Sea coast. The sediments of Abu-Galawa and Abu-Shaar lagoons had highest carbonate content due to dominance of biogenic sediments from the surrounding coral reefs and very little of terrigenious influx. The mud content recorded high values in Umm al-Huwayta¯t and Marsa Shu¯ni lagoons as compared with other two lagoons dueto high contribution of terrigenous influx, especially near Umm al-Huwayta¯t lagoon. The sediments of Marsa Shu¯ni lagoon had highest total organic matter content as compared to other three lagoons resulting from high contribution of terrestrial input by Wadi El-Shu¯ni. Phosphorus content in sdiments samples from Umm al-Huwayta¯t lagoon recorded highest values. The investigation of distribution ofheavy metals (Fe, Zn, Cu, Pb and Cd) in surficial sediments ofthe coastal lagoons indicated that the degree of metal pollution was caused by anthropogenic activities or by natural impact by wadies. The present study provides information about nature and geochemistry of sediments and the extent of pollution that represents primary data base for managers to assess anthropogenic impacts, and betterfordetecting remedial meseaurs infuture. © 2015 Triveni Enterprise, Lucknow (India).

Mohamed A.M.E.,National Research Institute of Astronomy and Geophysics | Araffa S.A.S.,National Research Institute of Astronomy and Geophysics | Mahmoud N.I.,Geological Survey of Egypt
Pure and Applied Geophysics | Year: 2012

The integration of geological, geophysical, and geotechnical interpretation at the southern part of 15th of May City, have been used to evaluate the subsurface stratigraphy, especially the clay layer which may cause serious danger to construction. Those techniques have been used to delineate the subsurface structures as normal faults, which play a critical role on the stability of buildings. Geological setting of the area has been evaluated through the construction of a geological map from different geological sections and samples obtained from more than 30 observation points. Geophysical tools such as vertical electrical soundings (12 VESs), 2-D dipole-dipole array (7 sections), P-wave shallow seismic refraction (31 profiles) and multiple channel analysis of surface waves (31 MASW profiles) have been carried out to image the subsurface situation. Geotechnical evaluation using 26 boreholes, samples, laboratory tests and geotechnical parameters has been done at the area of interest. The geological setting demonstrates that the city had been constructed on the second and third members of Qurn Formation (Upper Eocene) composed of argillaceous limestone, marl and shale. Two normal faults are passing through the area were observed. The resistivity (VES and dipole-dipole) and seismic (P-waves and MASW) results reflect the presence of the two normal faults cross the study area, affecting the obtained section of marl, clayey marl and limestone layers. The geotechnical information indicate the presence of the normal faults and the existence of clay layer with swelling ability reaching 140%, which may cause cracks in the upper layers and/or subsidence. © 2011 Springer Basel AG.

Issawi B.,Geological Survey of Egypt | Sallam E.,Benha University | Zaki S.R.,Geological Survey of Egypt
Arabian Journal of Geosciences | Year: 2016

Southern Egypt is mostly covered by clastic sediments belonging to the Paleozoic and the Mesozoic. The Precambrian basement rocks bound the Etbai area to the east and Gabgaba area to the west. The basement extends further west forming dissected small and major exposures in southern Egypt, south of latitude 23° 30′ N but are covered by Cretaceous-Lower Tertiary sediments further north, the Western Limestone Plateau. The clastic sediments in southeast Egypt, on the western side of the basement rocks in-between latitudes 22° N and 24° 35′ N, built two sub-basins, Kom Ombo (Garara) sub-basin in the north and south Nile Valley sub-basin in the south. These are separated by a dissected basement wall. The two sub-basins have different lithostratigraphic successions, Paleozoic (Early to Late) in the south Nile Valley sub-basin whereas Late Paleozoic-Mesozoic-Tertairy in the Kom Ombo sub-basin. The platform clastic sediments within both sub-basins were possibly supplied from an easterly located Paleotethys extending to North Gondwana. The Oxfordian opening of the Indian Ocean associated with rise in sea level supplied more waters to the north and sediments by passed the filled southern Nile Valley sub-basin and reached the adjacent Kom Ombo sub-basin defining a depositional shift. On the other hand, during the Jurassic, Northern Egypt received Neotethys waters that filled deeper sub-basins (e.g., the Maghara sub-basin), hence the difference in lithology between Jurassic northern and southern sediments. Since the Jurassic, most of Egypt received Tethys waters. In the drilled wells studied, the younger top sediments surrounding the well sites are related to the Tethys geostratigraphy. The sub-basins in southern Egypt are controlled by N-S faults defining constant subsiding basins. The E-W Guinea–Nubia Lineament bounds the northern side of the Kom Ombo sub-basin, where it is closed by a northern basement arch. © 2016, Saudi Society for Geosciences.

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