@article { author = {AWAD, M.H. and AL NADEEM, G.A. and SAMEEH, S.A and HEMEID, A.R}, title = {GEOCHEMISTRY OF THE PHOSPHATE DEPOSITS AT EL-RASHDA, EL-MAWHOOB AREA, DAKHLA OASIS, WESTERN DESERT, EGYPT}, journal = {Al-Azhar Bulletin of Science}, volume = {24}, number = {Issue 2-D}, pages = {1-24}, year = {2013}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2013.6590}, abstract = {This work comprises an attempt carried out to throw light on the geochemical evalution of the phosphorite deposits at  El-Rashda, El-Mawhoob area, Dakhla oasis, Western Desert, Egypt. The work is based on the field and laboratory work. Fifty stratigraphic sections, 19 borholes representing the study area, where studied, measured, sampled and studied. The laboratory work comprises 69 samples for determining the physical properties, 11 samples for XRD analyses, 27 thin sections and 133 samples for chemical analyses using XRF method to detect the major oxides, SiO2, Al2O3, Fe2O3, CaO, MgO, Na2O, SO3, Cl, P2O5, F, L.O.I. as well as trace the elements, Ba, Sr, Cu, Pb, Zn, Mn, Ni, Co, Ti, V, Y, Ce. According to the results of, chemical characteristics it can be concluded that the phosphorite deposits in the study area are suitable for fertilization used in the agriculture sector. As well as used in animal feed supplements, food preservation, anticorrosion gents, cosmetics, fungicides, ceramics, water treatment and metallurgy, very important in steel production, in the making of phosphor bronze, the thermal phosphorus used in the treatment of many surface minerals as, Aluminium, Copper, Iron.}, keywords = {THE PHOSPHATE DEPOSITS,EL-RASHDA,Western Desert,Egypt}, url = {https://absb.journals.ekb.eg/article_6590.html}, eprint = {https://absb.journals.ekb.eg/article_6590_ffa8d671f4aa8b30f6e45f2325044286.pdf} } @article { author = {AWAD, M.H. and AL NADEEM, G.A. and SAMEEH, ,S.A and HEMEID, A.R}, title = {FACIES AND DEPOSITIONAL ENVIRONMENT OF THE PHOSPHATE DEPOSITS AT EL-RASHDA, EL-MAWHOOB AREA, DAKHLA OASIS, WESTERN DESERT, EGYPT.}, journal = {Al-Azhar Bulletin of Science}, volume = {24}, number = {Issue 2-D}, pages = {25-43}, year = {2013}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2013.6591}, abstract = {This work which is based on the field and laboratory investigations represents to throw light on the geological, mineralogical, geochemical and environmental deposition of the phosphorite deposits at El-Rashda, El-Mawhoob area, Dakhla, Western Desert, Egypt. fifty stratigraphic sections, 19 borholes representing the study area, are measured, sampled and studied. The laboratory work comprises 69 samples for studying physical properties, 11 samples for XRD analyses, 27 thin sections and 133 samples for chemical analyses using XRF method to detect the major oxides, as well as trace element. The studies revealed that flour apatite, carbonate flourapatite, carbonatehydroxylapat, flourellestadite, ankerite, dolomite, are the main constituents of the studied phosphorite deposits. While the associated minerals are, halite, quartz, anhydrite, montmorillonite, calcite. (table.1). Chemically; the average contents of Al2O3, SiO2 are comparatively low in the study area, while the average content of MgO,  Fe2O3 and SO3  are relatively high. The low contents of Al2O3, SiO2 may be attributed to locate them outside the apatite lattic. While the high content of MgO may be due to derivation of MgO from dolomite by the oxidation processes, or resulted from the negative relationship of MgO, CaO where Ca2+ substitute by Mg2+ (McConnell 1980). The iron content in phosphorites deposits is valueless for any postdepositional indications, as iron may enter the site of deposition at any stage, whether syngenetic or epigenetic. Field observations and petrographic, mineralogical, chemical studies revealed that the origin of the phosphorite deposits at the study area points to shallow marine environment and controlled by various physico-chemical conditions.}, keywords = {environment,THE PHOSPHATE DEPOSITS,AT EL-RASHDA,Western Desert,Egypt}, url = {https://absb.journals.ekb.eg/article_6591.html}, eprint = {https://absb.journals.ekb.eg/article_6591_d37d201ffef34b1b9044dddab9024a7f.pdf} } @article { author = {SAAD, AHMED MAHMOUD}, title = {GEOLOGICAL, SOIL AND ROCK MASS EVALUATION FOR RISK ASSESSMENT OF BADR CITY, EGYPT}, journal = {Al-Azhar Bulletin of Science}, volume = {24}, number = {Issue 2-D}, pages = {45-60}, year = {2013}, publisher = {Al-Azhar University, Faculty of Science (Boys)}, issn = {1110-2535}, eissn = {2636-3305}, doi = {10.21608/absb.2013.6592}, abstract = {The study was conducted to assess the index properties and characterize soils and rocks of badr City, as well as their effects on the construction stability. Geological, engineering geological and geotechnical condition of the rocks and soils was studied on the bases of field description and laboratory analysis. It aims also at providing an alternative solution for the expected concerned problems of these shallow facies. From these facies clay layer which has an obvious dangerous effect on the building construction and on any other establishments. The claystone consists of kaolinite, montmorillonite and illite types. The liquid limit ranges from 49 to 175 %, the plastic limit ranges between 20 and 42 % and the shrinkage limit ranges between 9.88 and 13.3 %. The values of the free swelling of the studied samples are ranging between 98 and 180 %. The swelling pressure ranges from 3 to 6.2 Kg / Cm2. Claystone of study area can be classified as inorganic clay of high and extremely high plastic soil.}, keywords = {Engineering geological,liquid limit,Badr City,Swelling pressure,rock mass,soils}, url = {https://absb.journals.ekb.eg/article_6592.html}, eprint = {https://absb.journals.ekb.eg/article_6592_141e3ef9724ccf53888825334c3e4264.pdf} }