ABSTRACT
Major- and trace-element contents in muscovite and lepidolite from the Li-pegmatite deposit of Gonçalo, hosted by Hercynian granites in northern Portugal, have been determined. Gonçalo muscovite is a lithian muscovite containing relatively high Ti, Fe and Ni, while lepidolite is comparatively enriched in Rb, Cs, F, Na, Mn and Co. The comparison of the studied micas with Li-rich micas from the Fregeneda Hercynian pegmatite (western Spain) suggests that at Gonçalo a high F content in the pegmatitic fluids favored the crystallization of lepidolite. The pegmatitic fluids were magmatic in origin, evolved from Li-rich granites.
