Distribution of Beryllium in Rocks from the SN-W Granite of Regoufe, N-Portugal
Recently, Vriend et al. (1985) studied the trace element behaviour of the Regoufe granite. The Regoufe granite is situated about 70 km SE of Oporto and belongs to the Hercynian massifs in the north of Portugal. The granite has been studied in detail by Sluyk (1963). The intrusion is a two-mica granite. Biotite occurs only in restricted parts. The granite has been metasomatically altered and the following processes can be distinguished: albitisation, microclinisation, muscovitisation and quartzification (Sluyk, 1963). Beryllium minerals have not been found in the granite itself. Within and around the granite quartzveins occur with wolframite and cassiterite. Sluyk (1963) found rare beryl and even more rare bertrandite in the ore veins of Minas de Regoufe. Bertandite is proposed to be an alteration product of beryl and occurs only in the immediate vicinity of beryl.
KeywordsIncompatible Element Major Mineral Clear Relation Petrographical Characteristic Alteration Product
- Sluyk, D. (1963): Geology and Tin-Tungsten Deposits of the Regoufe area, N-Portugal. Thesis Univ. of Amsterdam, 123 pp.Google Scholar
- Tischendorff, G. (1977): Geochemical and petrographical characteristics of silicic rocks asociated with rare element mineralisation. In MAWAM, vol. 2, (M. Stemprok and L. Burnol, eds., Geol. Surv. Prague, 41–96.Google Scholar
- Voncken, J.H.L., Vriend, S.P., Kocken, J.W.M., Jansen, J.B.H.: Determination of beryllium and its distribution in rocks of the Sn-W granite of Regoufe, N-Portugal. In prep.Google Scholar