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

Khairiya M Fawzy

doi:10.4236/ojg.2017.71007

Abstract

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.

Highlights

IntroductionHussein et al [4] divided the Egyptian younger granites into suture related granites (G2-granite) formed in post-orogenic environment and intraplate granites (G3-granite) related to rifting processes
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
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

Summary

Introduction

Hussein et al [4] divided the Egyptian younger granites into suture related granites (G2-granite) formed in post-orogenic environment and intraplate granites (G3-granite) related to rifting processes. EI-Sayed [6] classified the Egyptian granites into I-type orogenic arc related and A-type anorogenic rift-related granites. Some of the post-collisional A-type granite plutons in the ANS are considered as specialized granites [7] [8] [9]. They are characterized by a marked enrichment in granitophile trace elements and valuable metals of economic interest, like Nb, Ta, Zr, Th, U, Y, Sn and rare earth elements (REE)

Methods

Findings

Discussion

Conclusion