Ref.: Mining Annual Review(1985):488. A tin property owned by Geomine (Belgium). Located near Fundão.
Argemela porphyroid microgranite is the subvolcanic expression of a high-Na/Li/P/F/REE peraluminous pegmatitic magma.
The microgranite is the mixture of two components :
A crystal "mush" (quartz, albite, phengite) injected from below through feeder dykes and an overprinting highly evolved component (Li, F, P, Be, Sn, Nb-rich), analog to a rare-element pegmatititic magmatitic component, acting as a lubricant for the ascending "mush".
Multistage growth of a rare-element, volatile-rich microgranite at Argemela (Portugal)
B. Charoy and F. Noronha
Journal of Petrology,Feb. 96, V 37, N° 1, Pages: 73 - 94
Charoy B, Noronha F (1991) The Argemela granite-porphyry (Central Portugal) : the subvolcanic expression of a high-fluorine, rare-element pegmatite magma. In : Pagel M, Leroy J L (Ed.), Source, Transport and Deposition of Metals. Proceedings of the 25 years Sga (Society for Geology Applied to Mineral Deposits) Anniversary Meeting, Nancy, 30 August-3 September 1991, A.A.Balkema, Rotterdam : 741-744
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Map Reference: 40°8'N , 7°30'W
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