Génesis y medio de formación del yacimiento de minerales de berilio asociados a la pegmatita de Franqueira, Pontevedra (Galicia)

• Moreiras, D. ^[1] ; Martín Izard, A. ^[1] ; Acevedo, R. ; Paniagua, A. ^[1] ; Marcos-Pascual, C. ^[1]
  1. [1] Universidad de Oviedo

     Universidad de Oviedo

     Oviedo, España

     
• Localización: Boletín de la Sociedad Española de Mineralogía, ISSN 0210-6558, Vol. 15, Nº. 1, 1992, págs. 216-221
• Idioma: español
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• Resumen

  • The aim of this paper is to describe the geological, mineralogical and geochemical remarks of the Franqueira pegmatitic mineralizations giving raise to a genetic descriptive model. Exometasomatic interaction of Be-rich pegmatitic bodies with dunitic wall-rocks leads to the development of gemstone deposit, several meters thick, formed essentilly of emerald, phenakite and chrysoberyl (alexandrite) in phlogopite gange. Endometasomatic hornblende-pyroxene-garnet facies is also locally developed. The mineralization resambles strongly the emerald-alexandrite type locality from Tokowaja (Oural) although the original dunitic body was this former occurrence not observed.