Homrit Akarem intrusion, Red Sea Governorate, Egypti

Regional Level Types
Homrit Akarem intrusion	Intrusion
Red Sea Governorate	Governorate
Egypt	Country

The post-collisional granites of the Homrit Akarem intrusion intrude into metamorphosed volcano-sedimentary successions, exhibiting sharp intrusive contacts. The core of the Homrit Akarem intrusion consists of alkali feldspar granite, which grades into muscovite granite and albitized granite. Alkali feldspar granite is the predominant rock type, while muscovite granite is less common and serves as the transitional zone between the pink granite and the whitish albitized granite that constitutes the marginal and the apical parts of the Homrit Akarem intrusion. The outer margins of the albitized granite are subjected to intense silicification and greisenization processes, and they are also penetrated by numerous pegmatite and fluorite veins.
In the study area, greisens are irregularly distributed along the margins of the albitized granite. They appear as pockets or as veins filling fractures and can also form extensive selvages surrounding quartz veins, occasionally extending into the surrounding country rocks. Greisens are easily identifiable in the field due to their bleached colors, and they are sometimes fragmented. The recorded greisen bodies associated with the Homrit Akarem intrusion can be classified into four types: muscovite-rich, cassiterite-rich, topaz-rich, and beryl-rich greisens.

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References