Low-temperature alteration of uranium–thorium bearing minerals and its significance in neoformation of radioactive minerals in stream sediments of Wadi El-Reddah, North Eastern Desert, Egypt

Ebyan, Osama A.; Khamis, H. A.; Baghdady, Ashraf; El-Feky, Mohamed G.; Abed, Neveen S.

doi:10.1007/s11631-019-00335-z

Cited by 19 publications

(6 citation statements)

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“…High sulfur contents indicate the role of chemical weathering by the effect of acidic solution in addition to the role of seawater and micro-organisms that lead to partial or complete dissolution of zircon crystals giving rise to new mineral associations (lowtemperature reaction forming low-temperature Umineralizations) and isomorphism between zircon, thorite, uranothorite and xenotime (high-temperature reactions). Also, the w-shape of the REE pattern (tetrad effect) was detected in the REE pattern of the stream sediments 10 . The high contents of sulfide minerals (pyrite and sphalerite) in the stream sediments leads to high contents of SO 3ion increasing acidity and enhance Zr, Hf, Th, U and REEs leachability from the recorded mineral association.…”

Section: Discussionmentioning

confidence: 93%

“…The presence of Ce positive anomaly and Eu negative anomaly indicates severe changes in the oxidation-reduction conditions that enhance low-temperature alteration processes. Oxidation-reduction conditions changes also occur by the effect of micro-organisms, indicating the presence of framboidal pyrite and biogenic sphalerite 10 .…”

Section: Discussionmentioning

confidence: 99%

“…Clarke values for the indicator elements in stream sediments.Contents of trace elements range from 438.1 to 1117.9 ppm for total REE, Zr from 278 to 1215 ppm for Zr, from 140.3 to 222.4 ppm for Nb, from 202 to 320 ppm for U, and from 246.8 to 305.2 ppm for Rb(Table 1). These concentrations indicate the presence of valuable elements such as REE, U, Zr, and Y in the study area.Figure 4shows the average trace elements concentrations for Wadi El Reddah compared with the average stream concentrations from other studies[5][6][7][8][9][10] . It is noticed that there is a distinct inter-basin variation where Y displays high contents at Wadi El Reddah stream sediment samples compared to the local and worldwide stream samples.…”

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confidence: 99%

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Stream Sediments Geochemical Exploration in Wadi El Reddah area, Northeastern Desert, Egypt

et al. 2020

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Wadi El Reddah representing a semi-closed basin, extends in the N-S direction. It has only one outlet at the northern tip while the wadi collects floodwater from internal tributaries along wall rocks. The present study discusses the relationship between geology and geochemistry data to detect anomalous radioactive locations. The geochemical maps show the mineralization areas with abnormal rare metal contents. This led to two uranium occurrences (GXXIII and GXXIV) at Gabal Gattar in the perthitic leucogranite. At Wadi El Reddah, high contents of pathfinder elements (REE, Y, Zn, Nb and As) were discovered at the southern and eastern boundaries. This may be attributed to the presence of alkali feldspar granite at Gabal Gattar at the upstream of Wadi El Reddah and also to the sharp contact between Gabal Gattar and Hammamat Sedimentary rocks. A strong positive correlation coefficient between Fe2Ot and or Al2O3 with Zr, Hf, Nb, Ta, REE, U, Rb, and Th reflects their association with thematization processes.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Stream Sediments Geochemical Exploration in Wadi El Reddah area, Northeastern Desert, Egypt

et al. 2020

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“…It was shown that solar chimneys are a practical approach to saving energy for residential buildings in transitional seasons in China's hot summer and cold winter areas. Danesh [11], Okasha, et al [12], Abed, et al [13], Taha, et al [14], and Ebyan, et al [15] studied the effect of using solar chimneys to reduce the heating load in cold climates in many countries. The buildings were adapted to the local climate conditions using sustainable architectural techniques and materials; thereby, the highest level of climatic comfort was provided.…”

Section: Introductionmentioning

confidence: 99%

Investigation of natural ventilation using a solar chimney in various solar cases

Abdel-Baky,

Eaid,

El-Khaldy

et al. 2024

ijirss

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The high cost of conventional energy production, its uses, and its negative environmental impact led scientists to look for many ways to solve this problem. The main issues are environmental pollution, the high cost of air treatment, and the high cost of energy production. An essential solution is using renewable energy instead of traditional energy (petroleum, coal, natural gas, and electric power). As it is a permanent energy source, it causes no air pollution and is cheaper. In this work, an experimental study was conducted on using solar energy as an energy source in the natural ventilation of buildings and the factors affecting this ventilation. A solar chimney has been installed with and without storage materials to store energy for natural identity during sunrise and after sunset. In this work, the difference in air density with different temperatures is the main factor for energy production, which leads to a change in the airspeed (natural ventilation). The study indicates that indoor air velocity can remain higher than ambient air velocity during the day and at night for several hours. This reduces demand and dependence on conventional energy usage, which leads to cost reductions and a reduction in air and environmental pollution.

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“…SyenograniteHydrothermal alteration causes mobilization of most trace elements, due to the dissolution of minerals and the formation of new mineral phases(El-Mezayen et al, 2015: Abedini et al, 2018a: Ebyan et al, 2019. The loss and gain of some elements are mainly attributed to the variations in the geochemical characteris-…”

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confidence: 99%

Geological, Mineralogical and Geochemical Aspects of the Granitic Rocks at Umm Nafie Area, North Eastern Desert, Egypt

Elbalakssy

STEET²,

TOHAMY³

2020

Nuclear Sciences Scientific Journal

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Wadi Umm Nafie area is located between lat. 26˚18`-27˚05`N and long. 33˚23`and 33˚29`E. The rocks cropping out in the area are older granitoids and younger granites. The studied area displays secondary structures which are represented by joints and faults. The most predominant fault sets are trending in NE-SW, NNW-SSE and NW-SE directions. Petrographically, the older granitoids are classified as quartz diorites and the younger granites as syenogranites. The radioactivity of the syenogranites is significantly high, comparing with the older granitoids. The anomalous syenogranite (about 1x5m dimensions) exhibits equivalent uranium occurrences that vary considerably in their contents from 115.5 to 125 ppm with an average of 122.8 ppm and from 139.2 to 168.6 ppm equivalent thorium with an average of 155.4 ppm. Th-U, Zr-U, Zr-Th, , Nb-U, Nb -Th relationships show ill-defined trends, suggesting that radioelements distribution aren't controlled by accessory minerals but essentially related to the latter hydrothermal solutions. Anomalous syenogranite is affected by various phases of hydrothermal alteration processes along brittle structures, comprising hematitization, chloritization, epidotization, silicification and kaolinitization. Unusual REEs patterns and non-CHARAC ratios of isovalents confirm that the anomalous syenogranite is affected by late stage hydrothermal solutions resulting fluid-rock interaction and M-type tetrad effect. U and REEs could be leached from the sheared syenogranite at low pH conditions and precipitated in alkaline environments by hematitization process. The main minerals occur in the highly radioactive syenogranite are thorite, uranothorite, betafite, yttrocolumbite, samarskite, ishikawaite, polycrase and fergusonite, in addition to zircon, xenotime, allanite, cerite and monazite.

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Low-temperature alteration of uranium–thorium bearing minerals and its significance in neoformation of radioactive minerals in stream sediments of Wadi El-Reddah, North Eastern Desert, Egypt

Cited by 19 publications

References 46 publications

Stream Sediments Geochemical Exploration in Wadi El Reddah area, Northeastern Desert, Egypt

Stream Sediments Geochemical Exploration in Wadi El Reddah area, Northeastern Desert, Egypt

Investigation of natural ventilation using a solar chimney in various solar cases

Geological, Mineralogical and Geochemical Aspects of the Granitic Rocks at Umm Nafie Area, North Eastern Desert, Egypt

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