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Volume :9 Issue : 1 1982      Add To Cart                                                                    Download

Tin and beryllium mineralisation in relation to post-magmatic alteration, Homrit Mikpid area, Southeastern Desert, Egypt

Auther : MOSTAFA M. SOLIMAN

Department of Geology, Faculty o f Science, University of Zagazig, Zagazig, Egypt

 

ABSTRACT

 

The Homrit Mikpid area consists of rare-metal-bearing granites emplaced in a tectonically active region and affected in some zones by autopneumatolysis including sodium metasomatism and greisenisation. Greisens are devoid of beryllium minerals and contain cassiterite, columbite, topaz and fluorite. Beryl and chrysoberyl occur in the a1 bitised granites and albitites and increase in amount with the increase in degree of sodium metasomatism. The accumulation of beryllium in the albitised granites and albitites is ascribed to the sharp decrease in acidity due to the addition of sodium to the pneumatolytic solutions, some of which are probably derived from greisenised granites and greisens. Ti, Zr and Mn are distributed like Be, while Nb shows similar behaviour to Sn during post-magmatic alteration processes. From an economic point of view, the Homrit Mikpid granites may be regarded as important future reserves of Be and Sn in Egypt.

 

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