干旱区生态环境知识资源中心(Arid): Ras Abdah of the north Eastern Desert of Egypt: the role of granitic dykes in the formation of radioactive mineralization, evidenced by zircon morphology and chemistry

Arid

	Ras Abdah of the north Eastern Desert of Egypt: the role of granitic dykes in the formation of radioactive mineralization, evidenced by zircon morphology and chemistry
	Omran Ali A; Dessouky Osama K
来源期刊	Acta Geochimica
ISSN	2096-0956
出版年	2016
卷号	35 期号:4 页码:368-380
英文摘要	Syenogranitic dykes in the north of Egypts Eastern Desert are of geological and economic interest because of the presence of magmatic and supergene enrichment of radioactive mineralization. Zircon crystal morphology within the syenogranitic dykes allows precise definition of sub-alkaline series granites and crystallized at mean temperature of about 637 °C. The growth pattern of the zircons suggest magmatic and hydrothermal origins of radioactive mineralization. Hydrothermal processes are responsible for the formation of significant zircon overgrowth; high U-zircon margins might have occurred contemporaneously with the emplacement of syenogranitic dykes which show anomalous uranium (eU) and thorium (eTh) contents of up to 1386 and 7330 ppm, respectively. Zircon chemistry revealed a relative increase of Hf consistent with decreasing Zr content, suggesting the replacement of Zr by Hf during hydrothermal activity. Visible uranium mineralization is present and recognized by the presence of uranophane and autunite.
英文关键词	Syenogranitic dykes Zircon Morphology Typology Uranium Egypt
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Mineralogy
CSCD记录号	CSCD:5858260
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335733
作者单位	Omran Ali A, Nuclear Materials Authority, P.O. Box 530, El Maadi, Cairo, Egypt.; Dessouky Osama K, Nuclear Materials Authority, P.O. Box 530, El Maadi, Cairo, Egypt.
推荐引用方式 GB/T 7714	Omran Ali A,Dessouky Osama K. Ras Abdah of the north Eastern Desert of Egypt: the role of granitic dykes in the formation of radioactive mineralization, evidenced by zircon morphology and chemistry[J],2016,35(4):368-380.
APA	Omran Ali A,&Dessouky Osama K.(2016).Ras Abdah of the north Eastern Desert of Egypt: the role of granitic dykes in the formation of radioactive mineralization, evidenced by zircon morphology and chemistry.Acta Geochimica,35(4),368-380.
MLA	Omran Ali A,et al."Ras Abdah of the north Eastern Desert of Egypt: the role of granitic dykes in the formation of radioactive mineralization, evidenced by zircon morphology and chemistry".Acta Geochimica 35.4(2016):368-380.