الفهرس 
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Abstract
The present thesis involves geology, petrology, mineral chemistry, opaque mineralogy, geochemistry and petrogenesis of four selected masses of Younger Gabbros, from Sa’al (south Sinai), Umm Battat and El-Bakryia (central Eastern Desert) and Korab-Kansi (south Eastern Desert) in the Arabian Nubian shield. The following is a summary of the major characteristic features of the studied gabbroic masses.