Abstract Variable single and/or swarms of post-granitic dikes are widespread at Gabal Serbal, Southwestern Sinai, Egypt. The present article aims to identify and discriminate these multiphase dikes through detailed geological, petrographical, and geochemical examinations. These dikes are classified into two subphases: (1) acidic dikes (porphyritic dacite, microgranite, granophyre, and alkaline granophyre dikes); and (2) basic dikes (basalt and dolerite dikes). They range from vertical or steeply inclined bodies, 0.5–15 m wide, pink to black color, and NE–SW to N–S directions. Acidic dikes with different mineralogical constituents have medium to high k -characters, originating from calc-alkaline magma and extruded in a volcanic arc environment. In contrast, basic dikes have medium k -characters, originating from tholeiitic magma and developing within a plate environment. Basic dikes are enriched with opaque minerals, where the basaltic dike contains iron oxides (magnetite and hematite), such as apatite in addition to copper minerals. Dolerite dike comprises magnetite, titanomagnetite, and pyrite.

Dike

Dacite

10.1515/chem-2022-0136

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Citations (27)

Origin and tectonic environment of silicified ultramylonite in Abu Rusheid, Southeastern Desert, Egypt: geochemical aspects and spectrometric prospecting

Euro-Mediterranean Journal for Environmental Integration (2024)

Gehad M. Saleh Mohamed S. Kamar Amira M. El Tohamy Gehan M. Ali Azza Ragab

Prospecting

Desert (philosophy)

10.1007/s41207-024-00615-y

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Citations (0)

Critical raw material resources in Nugrus-Sikait area, South Eastern Desert, Egypt: Geological and geochemical aspects

Journal of African Earth Sciences (2022)

Farrage M. Khaleal David R. Lentz Mohamed S. Kamar Gehad M. Saleh El Saeed R. Lasheen

Muscovite

Pegmatite

10.1016/j.jafrearsci.2022.104782

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Citations (13)

An Extended Investigation of High-Level Natural Radioactivity and Geochemistry of Neoproterozoic Dokhan Volcanics: A Case Study of Wadi Gebeiy, Southwestern Sinai, Egypt

Sustainability (2022)

Mohamed S. Kamar Ibrahim A. Salem Ibrahim E. El-Aassy Abdu A. El-Sayed Hesham M.H. Zakaly

High-level natural radioactivity, geochemical, geological, and radiological hazard assessment of the poorly investigated Wadi Gebeiy Dokhan volcanics rocks are discussed. Wadi Gebeiy Dokhan volcanics are located in Southwestern Sinai, Egypt, covering an area of ~1.3 km2. Dokhan volcanics rocks are represented by porphyritic dacite. Geochemically, they have medium-k characters and originate from calc-alkaline magma within a volcanics arc environment. Along the fault plane striking NNE-SSW, and at its intersection with the NW-SE fault plane, altered Dokhan volcanics occur with high radioactive anomalies. Radiological parameters (absorbed dose rate, radium equivalent, activity annual effective dose, external and internal hazard indices) are used to evaluate their suitability as an ornamental stone. Except for the absorbed dose rate, all the radiological hazard indices show that unaltered Dokhan volcanics can be used as an ornamental stone. Controversially, the applied radiological indices reveal that altered Dokhan volcanics have a higher content than the recommended values of UNSCEAR, reflecting their risk on human organs.

Wadi

Porphyritic

Radium

10.3390/su14159291

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Citations (14)

Petrochemistry, rare metals-bearing minerals and spectrometric exploration in Khour Abalea, Abu Rusheid area, Eastern Desert, Egypt

Journal of African Earth Sciences (2023)

Gehad M. Saleh Mohamed S. Kamar Gehan Mohamed Amira M. El Tohamy

Cassiterite

Mylonite

Allanite

Wolframite

10.1016/j.jafrearsci.2023.105005

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Citations (6)

Distribution of Radionuclides and Radiological Health Assessment in Seih-Sidri Area, Southwestern Sinai

International Journal of Environmental Research and Public Health (2022)

Gharam A. Alharshan Mohamed S. Kamar El Saeed R. Lasheen Antoaneta Ene M.A.M. Uosif

The current contribution goal is to measure the distribution of the radionuclide within the exposed rock units of southwestern Sinai, Seih-Sidri area, and assess the radiological risk. Gneisses, older granites, younger gabbro, younger granites, and post granitic dikes (pegmatites) are the main rock units copout in the target area. Radioactivity, as well as radiological implications, were investigated for forty-three samples from gneisses (seven hornblende biotite gneiss and seven biotite gneiss), older granites (fourteen samples), and younger granites (fifteen samples of syenogranites) using NaI (Tl) scintillation detector. External and internal hazard index (Hex, Hin), internal and external level indices (Iα, Iγ), absorbed dose rates in the air (D), the annual effective dose equivalent (AED), radium equivalent activity (Raeq), annual gonadal dose (AGDE), excess lifetime cancer risk (ELCR), and the value of Upper Continental Core 232Th/238U mass fractions were determined from the obtained values of 238U, 232Th and 40K for the examined rocks of Seih-Sidri area. The average 238U mg/kg in hornblende biotite gneiss and biotite gneiss, older granites, and syenogranites is 2.3, 2.1, 2.7, and 8.4 mg/kg, respectively, reflecting a relatively higher concentration of uranium content in syenogranites. The results suggest that using these materials may pose risks to one's radiological health.

Hornblende

Radium

Pegmatite

10.3390/ijerph191710717

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Citations (24)

GEOLOGY, GEOCHEMISTRY AND RADIOACTIVITY OF THE MONZOGRANITE ROCKS, NORTH WADI GHADIR, SOUTH EASTERN DESERT, EGYPT

Nuclear Sciences Scientific Journal (2017)

Farrage M. Khaleal Mohamed S. Kamar Anas M. El-Sherif

Wadi Ghadir area show different types of the basement rocks such as; ophiolitic mélange, metabasalt, quartz-diorite, granodiorite and monzogranite.The fresh monzogranite suffered in elsewhere alteration processes and rich in sulphide minerals.The studied monzogranite has peraluminous character, alkaline affinity, emplaced in within plate setting and crystallized under low water vapour pressure (2-3Kb) and temperature (760-800 o C).The propylitic and K-metasomatism are the main alteration types in the studied altered monzogranite, while plagioclase destructed and formed epidote.The identified heavy minerals are mostly pyrite, sphalerite, galena, monazite, hematite and goethite.Mineral chemistry by EPMA analyses exhibit that pyrite mineral is rich in Co and Se and low values of Mn and Cu.The radioactivity increases toward the more acidic rocks, from granodiorite to altered monzogranite.The average eU content indicates that the fresh monzogranite is not uraniferous, while the altered monzogranite is uraniferous.

Wadi

Desert (philosophy)

10.21608/nssj.2017.30774

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Citations (3)

Geochemistry and mineralizations of the Wadi Ghadir younger granites and associated pegmatites, South Eastern Desert, Egypt

Arabian Journal of Geosciences (2014)

Mohamed S. Kamar

Pegmatite

10.1007/s12517-014-1307-0

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Citations (3)