干旱区生态环境知识资源中心(Arid): Geology, geochemistry, and radioactivity of El Maghrabiya young granites, Central Eastern Desert, Egypt

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DOI	10.1007/s12517-019-4755-8
	Geology, geochemistry, and radioactivity of El Maghrabiya young granites, Central Eastern Desert, Egypt
	Abd El Monsif, Mohamed; Tawfik, Sameh Z.; El Shaieb, Gehan B.
通讯作者	Abd El Monsif, Mohamed ; Tawfik, Sameh Z.
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2019
卷号	12 期号:21
英文摘要	The young granites of El Maghrabiya area located at the Central Eastern Desert, the southwestern part, are intensively altered along faults, fractures, and shear zones. Microscopically, the studied granites are classified as syenogranite and the altered portion exhibits features of ferrugination and episyenitization. This granite belongs to the high silica and low calcium, iron, and magnesium granites reflecting their origin from highly fractionated potassium-rich crustal material. El Maghrabiya syenogranites are generally uraniferous especially the altered portion that is characterized by high radioactivity. The hydrothermal activity is responsible for the formation of the anomalous zone characterized by extensive episyenitization and ferrugination processes. The ferruginated syenogranite has higher concentrations of uranium and thorium than the other altered granites (episyenitized). The present study revealed that zircon, fluorite, fluorapatite, and iron oxides are the most predominant U-bearing minerals in addition to uranophane that recorded in the ferruginated variety. The studied syenogranites characterized by two thorium ranges where the fresh granite exhibits the low range (22-45 ppm) and the altered granite characterized by the higher range (68-185 ppm) indicating that there are two pulses of the magma generating El Maghrabiya young granites. Uranium and thorium of the first generation are mostly attributed to the accessory minerals and related to the magmatic processes while the second generation is characterized by low Th/U ratio and high uranium content that is enriched by the hydrothermal solutions.
英文关键词	Maghrabiya Syenogranite Episyenitization Ferrugination Radioactivity
类型	Article
语种	英语
国家	Egypt
收录类别	SCI-E
WOS记录号	WOS:000492895100001
WOS关键词	FRACTIONATION ; ROCKS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
EI主题词	2019-11-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310570
作者单位	Nucl Mat Author, Cairo 530, Egypt
推荐引用方式 GB/T 7714	Abd El Monsif, Mohamed,Tawfik, Sameh Z.,El Shaieb, Gehan B.. Geology, geochemistry, and radioactivity of El Maghrabiya young granites, Central Eastern Desert, Egypt[J],2019,12(21).
APA	Abd El Monsif, Mohamed,Tawfik, Sameh Z.,&El Shaieb, Gehan B..(2019).Geology, geochemistry, and radioactivity of El Maghrabiya young granites, Central Eastern Desert, Egypt.ARABIAN JOURNAL OF GEOSCIENCES,12(21).
MLA	Abd El Monsif, Mohamed,et al."Geology, geochemistry, and radioactivity of El Maghrabiya young granites, Central Eastern Desert, Egypt".ARABIAN JOURNAL OF GEOSCIENCES 12.21(2019).