U-series isotopic composition of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia

Dawood, Yehia H.; El‐Naby, Hamdy H. Abd; Ghaleb, Bassam

doi:10.1007/s12517-013-0963-9

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…A completely different trend is observed when considering black gibbsite from the middle Um Bogma Formation (deeper layers); indeed, in these rocks, the D-factor remains close to 0.55: uranium was leached from these layers, probably transported away and finally deposited in the fractures of surrounding formations. Similar phenomena have been reported for U mineralization in Eastern Desert deposits (Dawood et al, 2014). Figures 3-4 show the correlation of eU, eTh and U (chemical measurements) with the K (%) content in the mineral samples.…”

Section: Radioactivitysupporting

confidence: 81%

Gold and Base Metals Associated with Uranium Mineralization in Some Lower Carboniferous Rock Units in the Wadi Abu El Mogheirat Area, Southwestern Sinai, Egypt

Sallam

Alshami

Abbas

et al. 2021

Acta Geologica Sinica (Eng)

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The Lower Carboniferous sediments at Wadi Abu El Mogheirat consist of four stratigraphic formations, from base upwards: Um Bogma, El Hashash, Magharet El Maiah and Abu Zarab formations. The most-concentrated radioactive anomalies at Wadi Abu El Mogheirat are in the middle member of the Um Bogma Formation. The gibbsitic marl in this formation shows the highest uranium contents (around 710 ppm). Gibbsitic marl and black gibbsite of the middle Um Bogma Formation show higher enrichment in Co, Cu, Mn, Ni, Pb, Zn, U, V, Ce and Th. Black gibbsite contains the highest total rare earth elements concentration, especially in terms of LREEs, while gibbsitic marl contains the highest content of HREEs. Anomalous contents of gold at Wadi Abu El Mogheirat are recorded for the first time in the gibbsitic marl (content: 10.4 ppm), black gibbsite (2.8 ppm) of the middle member of the Um Bogma Formation and in the siltstones of the El Hashash Formation (0.6 ppm). Gibbsitic marl shows the presence of uranothorite, celestite, zircon, atacamite, barite, xenotime and rutile. These characteristic demonstrate that the middle member of the Um Bogma Formation constitutes a potential source for gold. This conclusion is reinforced by the potential to exploit other metals such as Co, Cu, Mn, Ni, Pb, Zn, U, V, Th and Ce as by-products.

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Section: Radioactivitysupporting

confidence: 81%

Gold and Base Metals Associated with Uranium Mineralization in Some Lower Carboniferous Rock Units in the Wadi Abu El Mogheirat Area, Southwestern Sinai, Egypt

Sallam

Alshami

Abbas

et al. 2021

Acta Geologica Sinica (Eng)

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“…Most of the radioactive occurrences in the Arabian Shield of Saudi Arabia are present in alkali granite and associated pegmatite. This association has been subjected earlier to metasomatic processes (Dawood et al ., 2014). These rocks contain considerable amounts of heavy minerals, such as ilmenite, magnetite, garnet, monazite, zircon, rutile, pyrite, siderite, sphalerite, and titanite.…”

Section: Introductionmentioning

confidence: 99%

“…U‐series isotopic composition indicates that secondary uranium mineralization in Jabel Sayid is characterized by high 230 Th/ 234 U and 230 Th/ 238 U activity ratios. Conversely, the low 234 U/ 238 U activity ratio of this mineralization is indicative of enhanced groundwater circulation at the time of mobilization and reprecipitation (Dawood et al ., 2014).…”

Section: Introductionmentioning

confidence: 99%

Significance of radioelements distribution in the Precambrian rocks of Jabel Sayid, western Saudi Arabia, using spectrometric and geochemical data

et al. 2020

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In situ gamma‐ray spectrometry measurements were carried out using RS‐230 BGO spectrometer over an area of 9.4 km2. One hundred and seventy eight spectrometric points were collected along parallel profiles with spacing 325 m in the Easting X direction and Northing Y direction. The results are treated statistically to determine the minimum, maximum, arithmetic mean (X), SD (S), and coefficient of variability (CV %). The spectrometric survey revealed the presence of radioactive zones in the aplite‐pegmatite with maximum eU content of 1,550 ppm and eTh of 7,974 ppm, whereas alkali granite has an average eU content of 12 ppm and eTh of 34 ppm. Felsite has an average eU and eTh close to that of alkali granite, 11 and 32 ppm, respectively. Pegmatite veins cutting alkali granite have high values of eU and eTh, an average of 34 and 101 ppm, respectively. The metamorphosed volcanic rocks of the Mahd Group demonstrate the lowest radioactivity with an average eU content of 0.8 ppm and eTh of 1.6 ppm. These rocks partly show evidences of post‐magmatic alteration processes, for example, silicification, sericitization, and oxidation. Excluding metavolcanics, the strong positive correlation between eU and eTh for the different rock varieties reflects their geochemical coherence during magma crystallization and indicates that both elements are largely accommodated into accessory minerals and were not disturbed by alteration. The CV values of the different rock units show normal distribution, where all the percentages of CV values are less than 100, with the exception of eU of felsite that shows CV % value slightly higher than 100. The aplite‐pegmatite, alkali granite, and the associated pegmatite veins show negative value of uranium outward migration, but are still the most favorable host rocks for uranium and thorium mineralization. A tentative interpretation of such contradiction suggests that uranium is largely accommodated into accessory minerals and only limited labile uranium redistribution has occurred and uranium was precipitated in association with alteration products. This interpretation is supported by the presence of kasolite Pb(UO2)SiO4.(H2O), along the fractured zones and quartz veins in the aplite‐pegmatite. The limited uranium migration in the study area was also revealed by the low weathering rate estimated by the calculations of chemical indices of alteration.

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Isotope geochemistry of the Miocene and Quaternary carbonate rocks in Rabigh area, Red Sea coast, Saudi Arabia

Dawood¹,

Aref²,

Mandurah³

et al. 2013

Journal of Asian Earth Sciences

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U-series isotopic composition of kasolite associated with aplite-pegmatite at Jabal Sayid, Hijaz region, Kingdom of Saudi Arabia

Cited by 5 publications

References 36 publications

Gold and Base Metals Associated with Uranium Mineralization in Some Lower Carboniferous Rock Units in the Wadi Abu El Mogheirat Area, Southwestern Sinai, Egypt

Gold and Base Metals Associated with Uranium Mineralization in Some Lower Carboniferous Rock Units in the Wadi Abu El Mogheirat Area, Southwestern Sinai, Egypt

Significance of radioelements distribution in the Precambrian rocks of Jabel Sayid, western Saudi Arabia, using spectrometric and geochemical data

Isotope geochemistry of the Miocene and Quaternary carbonate rocks in Rabigh area, Red Sea coast, Saudi Arabia

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