Characterization of a Post Orogenic A-Type Granite, Gabal El Atawi, Central Eastern Desert, Egypt: Geochemical and Radioactive Perspectives

• 作者: Khairiya M. Fawzy
• 来源期刊: 地质学期刊(英文)
• 学科: 地球科学
• 关键词: Radioactivity Geochemistry POST-OROGENIC A-TYPE Granite Gabal EL Atawi CENTRAL Eastern Desert EGYPT
• 年，卷（期）: 2017,（1）
• 页码范围: 93-117
• 页数: 25页
• 分类号: P5

摘要

The alkali feldspar granite of Gabal El Atawi is post orogenic granite originated from subalkaline magma in extensional suite. It is developed within plate tectonic setting and has A2-type character which generated from apparent crustal source. The petrographic, geochemical and radioactive characteristics of El Atawi granite meet and fulfill the requirements of being fertile granite and it can be considered as promising uraniferous granite. Fluid inclusion studies of the altered granite elucidated two different solutions acting on the host granitic pluton. The first is NaCl-CaCl low temperature fluid with a wide range of salinity. The second is high temperature and salinity Fe-Mg-Na chloride solution. Different fractures in the granite acted as good channels for the hydrothermal fluids that leached uranium from its bearing minerals disseminated all over the host granite and redeposited it in the alteration zones.