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Your search keyword '"Marwa M. Abdel Azeem"' showing total 3 results
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3 results on '"Marwa M. Abdel Azeem"'

1. Mineralogical and radiological studies on some Paleozoic yellow ochre deposits in Southwestern Sinai, Egypt

Author

Marwa M. Abdel-Azeem, Nareman M. Harpy, Abdalla S. Alshami, and Wael M. El Maadawy

Subjects
Yellow ochre, Paleozoic sedimentary rocks, Radioactivity levels, Radiation hazard, Environmental assessment, Medicine, Science
Abstract

Abstract Yellow ochre is the basic material used in the manufacture of yellow oxide (a commercial product). Yellow ochre samples were taken from three different formations in southwestern Sinai: Abu Hamata, Um Bogma, and Abu Zarab. Yellow ochre occasionally exists in Abu Hamata Formation particularly in El Ferah area, associated with Fe–Mn ore in Wadi El Sahu (Um Bogma Formation) and in Himayer area (Abu Zarab Formation). The XRD analysis of the raw material reveals that they are mainly composed of goethite, which is associated with quartz and kaolinite in El Ferah area, hematite, kaolinite and quartz in Himayer area, and kaolinite, gypsum and quartz in Wadi El Sahu. The commercial product is mainly composed of goethite, quartz, and calcite. The heavy mineral investigation shows that some yellow ochre samples contain zircon and rare earth sulfate which may be responsible for the radioactivity of ochre due to their thorium and uranium content. The average values of specific radio-activities of most radionuclides in the samples of Himayer area I and II, and El Sahu I are higher than the respective world averages, while their activities are lower in El Ferah and El Sahu II. Th/U and Ra/U ratios exhibit vigorous changes in physico-chemical conditions during uranium leaching and deposition. Most of the radiological parameters in the ferruginous sediment and commercial product samples from El Ferah, El Sahu II, and Himayer II are lower than the recommended international values but higher than those from Himayer I and El Sahu I samples. The plotted hierarchical cluster analysis (HCA) exhibits that the main contributors for the hazards of these sediments and their commercial product are 238U, 232Th and 226Ra in Himayer I &II, commercial products, and El Ferah area, 232Th and 226Ra in El Sahu II , 232Th, 40K and 226Ra in El Sahu I.

Published
2024
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2. Natural radionuclides distribution and environmental impacts of ferruginous sand-siltstone (raw material) and their manufactured Ahmer oxide used as wall paints

Author

Mahmoud R. Khattab, Abd El Hadi A. Abbas, and Marwa M. Abdel Azeem

Subjects
Radionuclide, Metallurgy, Oxide, 010501 environmental sciences, Management, Monitoring, Policy and Law, Raw material, Hematite, 01 natural sciences, Natural (archaeology), 030218 nuclear medicine & medical imaging, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, chemistry, visual_art, visual_art.visual_art_medium, Environmental science, Siltstone, Waste Management and Disposal, 0105 earth and related environmental sciences
Abstract

Commercially known Ahmer oxide paints are prepared from raw material mainly composed of red iron oxides (hematite) and iron oxyhydroxides. The raw material used in manufacturing of Ahmer oxide come...

Published
2018

3. Mineral genesis and radioactivity of the upper part of the Adediya Formation, southwestern Sinai, Egypt

Author

Mohamed M. Abu-zeid, Ahmed El Kammar, Ibrahim E. El Aassy, Ehab K. Abu Zied, Sami K. Aita, Marwa M. Abdel Azeem, and Gehan A. Aly

Subjects
Supergene (geology), Mineral, Rare earth, Geochemistry, Geology, Heavy metals, engineering.material, Diagenesis, Ironstone, Geochemistry and Petrology, Genetic model, engineering, Economic Geology, Sedimentary rock
Abstract

The upper part of the Adediya Formation (Cambro-Ordivician) exposed in southwestern Sinai represents a very interesting succession. It contains mineralizations which are exceptionally rich in radioactive and rare earth elements as well as heavy metals. Field and several laboratory studies were carried out on this part of the Adediya Formation exposed in four stratigraphic sections distributed in a geographically wide area in southwestern Sinai. The radioactive mineralizations exist in sandstones, ironstone bodies and, to a much lesser extent, siltstones. Each of these rock types has a relatively wide range of textural characteristics. The recorded mineral assemblage consists of a large number of essential and accessory minerals some of which are radioactive and REE-bearing. The obtained field and laboratory data were implemented to determine the sedimentary history of the host rocks and the genesis of the mineral species which constitute the mineralizations. This included the identification of the types and effects of the various diagenetic processes and hydrothermal activity which led to the genesis of the recorded mineralizations. Also, the relative roles played by these post-depositional processes in determining the mineral, chemical and radioactive characteristics of the mineralizations and host rocks were assessed. These roles resulted in redistribution of the various elements especially the radioactive and rare earth elements as well as heavy metals during the epigenetic phase particularly by the action of supergene processes. A genetic model for the studied mineralizations is proposed.

Published
2017

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