New insights into Cryogenian arc granitoids hosting Th-U mineralized Ediacaran syenogranite dikes, Ra’s Abdah area in the northern Egyptian Nubian Shield: Constraints from U‐Pb ages and zircon geochemistry

Dessouky, Osama K.; Sun, Weidong; Ibrahim, W. S.; Ali, Hani H.; Hassan, M.; Li, Congying; Omran, Ali A.; Dardier, Ahmed M.

doi:10.1016/j.precamres.2020.105986

Cited by 22 publications

(17 citation statements)

References 82 publications

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“…Table 1 shows how to calculate the radiological risk parameters using the activity concentrations of 238 U, 232 Th, and 40 K, as well as the mathematical formulas. Radium equivalent activity is a weighted sum of the 226 Ra, 232 Th, and 40 K activities according to the hypothesis that 370 Bq kg −1 of 226 Ra, 259 Bq/kg of 232 Th, and 4810 Bq/kg of 40 K attain the same dose rates of gamma rays.…”

Section: Gs-256 Spectrometermentioning

confidence: 99%

“…Ionizing radiation in naturally occurring radioactive elements (NORMs) makes the human body uneasy. External strategy exposure from the emitted gamma rays of terrestrial radionuclides such as 238 U, 232 Th, and 40 K and internal mechanism exposure from breathed radon gas and its daughters are the two main forms of exposure [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…These programs have led to the investigation of many sites of these granites bearing U, Th, Zr, Nb, Ta, Sn, and another valuable rare metals. Rare metal mineralization is restricted to granites such as the El Missikat [35,36], El-Erediya [37,38], Ras Abda [39][40][41], Gattar [42][43][44][45], and El Sela younger granite plutons in the south of the Eastern Desert [46][47][48][49]. The post-orogenic magmatism in the ED occurred between 530-620 Ma [50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

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Excess Lifetime Cancer Risk Associated with Granite Bearing Radioactive Minerals and Valuable Metals, Monqul Area, North Eastern Desert, Egypt

et al. 2022

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The present work is concerned with assessing the cancer risk contributed by the studied granite types including valuable metals, such as Cu, Au, and Ba mineralization, as well as radioactive-bearing mineralization, such as monazite and zircon, in south Monqul at Wadi Makhrag El Ebel, north Eastern Desert, Egypt. The mineralization analyses illustrated that copper mineralization containing chrysocolla and tenorite minerals were restricted to the alteration zone, especially (argillic, phyllic, and propylitic) in monzogranite. However, barite veinlets had an ENE–WSW trend, while gold mineralization was confined to quartz veins having NE–SW trends. Monazite and zircon are radioactive-bearing minerals recorded in monzogranite causing high radioactive zones in south Monqul. The radionuclide activity concentrations were detected in the studied monzogranites. The mean values of AU (103 ± 91 Bq kg−1), ATh (78 ± 19 Bq kg−1), and AK (1484 ± 334 Bq kg−1) in the monzogranite samples were higher than the recommended worldwide average. The change in radioactive-transporting minerals found inside granite faults caused the high amounts of radioactivity seen in the samples. Due to the monzogranites being applied in building materials, the radiological hazards were assessed by calculating risk indices such as annual effective dose (AED) and excess lifetime cancer risk (ELCR). The acceptable limit for the ELCR readings was surpassed. As a result, the investigated monzogranite samples are not suitable for use in infrastructure materials.

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Section: Gs-256 Spectrometermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Excess Lifetime Cancer Risk Associated with Granite Bearing Radioactive Minerals and Valuable Metals, Monqul Area, North Eastern Desert, Egypt

et al. 2022

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“…It is medium to coarse-grained and displays numerous irregular cavities due Fig. 2 Geologic map of Qena-Safaga road, Central Eastern Desert, Egypt (modified after Dessouky et al 2020) to quartz dissolution (episyentization) (Fig. 3g) (Cathelineau 1986;Hecht et al 1999;Recio et al 1997).…”

Section: Geologymentioning

confidence: 99%

“…Awad et al (2020) worked on the radioactivity of Um Taghir area and concluded that the progressive link between Uranium and Thorium proposes the syngenetic origin of radiation. Dessouky et al (2020) recognized uraniferous syenogranite dikes (597 ± 15 Ma) which intruded into arc granitoids (663.2 ± 8.4 Ma) in Ra's Abdah area of the northern Eastern Desert of Egypt. They further that zircons from dikes show noteworthy enrichment of Th and U; while zircons from arc granitoids display typical igneous zircon patterns with Th and U enrichment but significant negative Nb, La, Pb, and Sr anomalies (Abu Ela el al.…”

Section: Introductionmentioning

confidence: 99%

Petrogenesis and tectonic evolution of syn-to late granitoid rocks from Um Taghir NE Egyptian Nubian Shield Desert of Egypt: subduction to post-collision magmatism

2021

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The Pan-African rocks of Um Taghir area encompass metavolcanics, synorogenic granites, Dokhan Volcanics, younger gabbros, post-collision granites, and they are cross-cut by dikes. The current granitoid rocks comprise older weakly deformed tonalite-granodiorites intruded by late tectonic undeformed granite including monzo-syenogranites and alkali feldspar granites. The weakly deformed tonalite-granodiorite is characterized by a restricted range of SiO 2 (65.78-69.43%) with reasonable enrichment in the LILE (Ba, Rb, and K 2 O), small negative Nb anomaly, and low Rb/Sr ratio which is the distinguishing of most of the synorogenic and subducted I-type granitoids in the Egyptian Nubian Shield (ANS). It is supposed that tonalitegranodiorite was formed by fractional crystallization of the Abu Furad metagabbro-diorite which is designated by their more or less lined trend on variation diagrams and their elements contents are ascribed to fractional crystallization of ferromagnesian minerals and feldspars. The monzo-syenogranites and alkali feldspar granites show SiO 2 ranges of 71.86-75.88% and 73.74-78.62%, respectively, formed through limited melting of the tonalite-granodiorite crust by rising of asthenosphere fluids with fractional crystallization of feldspars and amphibole. They are enhanced in LILE and Nb, formed in shallower depth, and categorized as A-type post-collision granite. On the basis of the geodynamic model, granite phases are consistent with the prevalent change from compressional toward post-collisional setting in the North Eastern Desert (NED). The monzosyenogranites were partially transformed into episyenitized rocks (episyenitized monzo-syenogranites) via desilicification, displaying SiO 2 contents of 65.44-66.36%, where gains and losses in mass are generally minimal (7.52 and 8.98%, respectively) and most other elements are close to the isocon line. Both older-and younger-granite types are in harmony with their formation by fractional crystallization process and are dependable with the dominant transitional tectonic setting in NED.

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Early Ensimatic Stage of the Arabian-Nubian Shield

Hassan

Fowler

Dessouky

et al. 2021

Regional Geology Reviews

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New insights into Cryogenian arc granitoids hosting Th-U mineralized Ediacaran syenogranite dikes, Ra’s Abdah area in the northern Egyptian Nubian Shield: Constraints from U‐Pb ages and zircon geochemistry

Cited by 22 publications

References 82 publications

Excess Lifetime Cancer Risk Associated with Granite Bearing Radioactive Minerals and Valuable Metals, Monqul Area, North Eastern Desert, Egypt

Excess Lifetime Cancer Risk Associated with Granite Bearing Radioactive Minerals and Valuable Metals, Monqul Area, North Eastern Desert, Egypt

Petrogenesis and tectonic evolution of syn-to late granitoid rocks from Um Taghir NE Egyptian Nubian Shield Desert of Egypt: subduction to post-collision magmatism

Early Ensimatic Stage of the Arabian-Nubian Shield

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