Manganese deposits in a Carboniferous paleokarst profile, Um Bogma region, west-central Sinai, Egypt

Sharkawi, M. A. El; Aref, M. M. El; Motelib, A. Abdel

doi:10.1007/bf03326381

Cited by 27 publications

(7 citation statements)

References 10 publications

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“…In TUR1 the presence of phases of highs contents of Ba, Ca and Si is related to the geology of the area of origin. In particular the Um Bogma formation shows related mineralization (El Sharkawi et al, 1990;Magaritz and Brenner 1979).…”

Section: Turmentioning

confidence: 98%

“…Within the Wadi Naseib area, in the Um Bogma formation there are Mn deposits with Fe, Ba, Cu and Zn minerals (El Sharkawi et al, 1990;Magaritz and Brenner, 1979), and a gibbsite deposit associated with Fe, Pb, Zn, S, Si and K mineralization (Segev, 1984). El Reedy et al (1988) and El Aassy et al (2011) report the presence of uranium and thorium (105< U >5083 ppm, Th < 330 ppm; El Reedy et al, 1988) in Um Bogma and El Hashash formations.…”

Section: Geological Settingmentioning

confidence: 99%

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Compositional variation of turquoise-group minerals from the historical collection of the Real Museo Mineralogico of the University of Naples

et al. 2017

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Five turquoise samples, belonging to the XVII century historical collection of the Real Museo Mineralogico (University of Naples Federico II), were investigated by a multi-methodological approach based on powder X-ray diffraction, electron microprobe analysis in wavelength-dispersive spectroscopy mode, backscattered electron images from scanning electron microscopy in energy-dispersive spectroscopy mode, laser ablation inductively coupled plasma mass spectrometry, Fourier transform infrared and Raman spectroscopy.The samples originate from Sinai (Egypt), Santa Fè S. Miguel (New Mexico), Saxony (Germany), Montebras Creuse (France) and Nishapur (Khorassan, Iran) and display different mineralogical compositions and various mineral associations. The study has shown the presence of: (1) four minerals of the turquoise group: turquoise, faustite, chalcosiderite and planerite; (2) other phosphates from different groups: wavellite, crandallite, goyazite, gorceixite, variscite, metavariscite, fluorapatite; and (3) other minerals: voltaite, adularia and quartz.The present investigation is intended to show the mineralogical and geochemical variability of the samples with particular attention to the mineralogical parageneses, textural analyses and trace-element concentrations.

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Section: Turmentioning

confidence: 98%

Section: Geological Settingmentioning

confidence: 99%

Compositional variation of turquoise-group minerals from the historical collection of the Real Museo Mineralogico of the University of Naples

et al. 2017

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“…It is subdivided into three members as the following: a) Lower Shaley-Ore memberis the oldest rock of the Carboniferous and it is consisted of black shale and thin sandy dolomite and manganese-iron ore [7]. Authors of [8] introduced the karstification process in this member and the formation of karstified dolostone rocks with intrakarstic product manganese ores and caliche nodules [9]. This rock unit is highly radioactive, where U/Th concentration reaches 1000 -2000 ppm (parts per million); b) Middle Marly Dolostone-Siltstone memberis also karstified and lateritized covering the soil, thickness is about 6 -8 m and the radioactive content is 100 -250 ppm.…”

Section: Geologic Settingmentioning

confidence: 99%

Excessive lifetime cancer risk and natural radioactivity measurements of granite and sedimentary rock samples

El-Halim¹,

El-Dine²,

El-Bahi³

et al. 2017

Nucl. Phys. At. Energy

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Eighteen samples of sediments collected from Um Bogma, South Western Sinai, and twelve granite samples collected from Gabal Gattar, North Eastern Desert in Egypt have been investigated. Concentrations of radionuclides in sediment and granite samples were determined by γ-ray spectrometer using HPGe detector with a specially designed shield. The content of uranium is high in sediments and granite samples, and the content of 40 K in granite is higher than that in sediments. The absorbed dose rate ranged from 419 to 3908 nGy/h for sediment samples and from 1002 to 1307 nGy/h for granite samples. The representative external hazard indicies (H ex) for sediment and granite samples were estimated. The state of radioactive disequilibrium in the U-series at Um Bogma and Gabal Gattar areas were also studied. The activity ratios between 226 Ra/ 238 U for sediment and granite were calculated. Thorium to Uranium concentration ratios (Clark value) was also estimated. The total excess lifetime cancer risk (ELCR) was measured.

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“…Many geological, structural, geochemical and geophysical works have been carried out for Um Bogma area such as El Kassas (1967), Soliman (1975), Mostafa (1987), El Shahat and Kora (1988, El Rakaiby and El Aassy (1989), El-Sharkawi, et al(1990a), Mansour, (1994), Bishay, (1994, Morsy et al (1995), Botros (1995), Ashami (1995Ashami ( & 2003, Aita, (1996), El Agami (1996, Amer (1997), Abd EL-Monem, et al (1997), Ammar et al(1999), Afifi (2001) and Abdelaziz (2000). The U-mineralizations associated with Paleozoic rocks are classified into three types: 1) Paleo-channel fill deposits in the Quaternary conglomerates; 2) Paleoplacer deposits comprising lenses of enriched radioactive heavy minerals such as zircon, monazite and xenotime hosted within basal conglomerate, sandstones and shales of Adadia Formation; 3) Epigenetic U-deposits comprising oxidized uranyl minerals in the form of disseminations, encrustations, thin films and minute veinlets associated with marl, shale, claystone, gibbsite and (Mn, Fe) ores of Um Bogma formation.…”

Section: Geologic Settingmentioning

confidence: 99%

Lithologic Discrimination Using Selective Image Processing Technique of Landsat 7 Data, Um Bogma Environs Westcentral Sinai, Egypt

Bishta¹

2009

ear

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Um-Bogma area located in the westcentral part of Sinai, Egypt is covered by Precambrian basement rocks within the northern part of the Precambrian Arabian-Nubian crystalline massive. Satellite images are among continuous sources of digital data for mapping lineaments and lithology. In the present work, the lithologic discrimination and lineament analysis of Landsat-7 ETM+ data for Um Bogma area have been carried out using Geomatica PCI EASI/PACE (9.1) and GeoAnalyst PCI packages. A selective image processing technique (SIPT) is a new approach in Geomatica, which gives rise to valuable results in this work. The SIPT and the visual interpretation of the constructed Landsat false colour composite (FCC) and ratio images led to discriminate and delineate the lithologic rock units of the study area. The structural lineament pattern for each interpreted lithologic unit has been constructed using SIPT. The prepared rose diagrams for the extracted lineaments are very characteristic for each interpreted lithologic unit. The structural lineament analyses and the discriminated lithologic units are integrated to show their relationships to the high radioactivity occurrences of the study area. The NW-SE trend is the predominant regional structural lineament trend in the investigated area. The NE-SW to the ENE-WSW directions is the predominant minor structural lineament trends. The highest radioactivity zones of the study area are restricted to Um Bogma formation and the younger granitic rocks.

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Manganese deposits in a Carboniferous paleokarst profile, Um Bogma region, west-central Sinai, Egypt

Cited by 27 publications

References 10 publications

Compositional variation of turquoise-group minerals from the historical collection of the Real Museo Mineralogico of the University of Naples

Compositional variation of turquoise-group minerals from the historical collection of the Real Museo Mineralogico of the University of Naples

Excessive lifetime cancer risk and natural radioactivity measurements of granite and sedimentary rock samples

Lithologic Discrimination Using Selective Image Processing Technique of Landsat 7 Data, Um Bogma Environs Westcentral Sinai, Egypt

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