The mineral chemistry of gahnite, garnet and columbite-group minerals (CGM): Implications for genesis and evolution of the Kenticha Rare-element granite-pegmatite, Adola, Ethiopia

Magmatic and post-magmatic evolution of post-collisional rare-metal bearing granite: The Neoproterozoic Homrit Akarem Granitic Intrusion, south Eastern Desert of Egypt, Arabian-Nubian Shield

“…The presence of garnet as an accessory mineral in the muscovite granite phase of the HAGI is important in tracing the evolution of these rocks (Gaspar et al, 2008). The texture and chemical composition of garnet can be used to indicate pressure-temperature-fluid activity conditions during its growth (du Bray, 1988;Whitworth, 1992;Villaros et al, 2009;Zhang et al, 2012;Bekele and Sen, 2020). Spessartine-almandine garnets in general have many possible origins: (1) they may crystallize directly form Mn-rich peraluminous magma under suitable temperature and pressure conditions (du Bray, 1988;Dahlquist et al, 2007;Yang et al, 2013;Sami et al, 2020); (2) they may crystallize as phenocrysts in primary magma at deeper levels and be transported to higher crustal levels and emplaced (Harangi et al, 2001); (3) they may be a residual phase during partial melting (René and Stelling, 2007); (4) they may form as a secondary…”