Mineral genesis and radioactivity of the upper part of the Adediya Formation,southwestern Sinai,Egypt |
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| Institution: | 1. Geology Department, Faculty of Science, Ain Shams University, Cairo, P.O. Box 11566, Cairo, Egypt;2. Geology Department, Faculty of Science, Cairo University, Orman, Giza, P.O. Box13613, Egypt;3. Nuclear Materials Authority, Maadi, P.O. Box 530, Egypt;1. Applied Mineralogy Unit, Institute for Technology of Nuclear and Other Mineral Raw Materials, Franchet d''Esperey 86, P.O. Box 390, 11000 Belgrade, Serbia;2. Department of Mineralogy and Petrology, Faculty of Mining and Geology, University of Belgrade, Dju?ina 7, 11000 Belgrade, Serbia;3. Laboratory for Scanning Electron Microscopy, Faculty of Mining and Geology, University of Belgrade, Dju?ina 7, 11000 Belgrade, Serbia;4. Department of Economic Geology, Faculty of Mining and Geology, University of Belgrade, Dju?ina 7, 11000 Belgrade, Serbia;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, PR China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, PR China;3. Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Geography, Chinese Academy of Sciences, Xinjiang 830011, PR China;4. Department of Geology, University of Leicester, Leicester LE1 7RH, UK;5. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, PR China;1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;4. CODES ARC Centre of Excellence in Ore Deposits, University of Tasmania, Hobart, TAS 7001, Australia;1. Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| 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. |
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