Abstract
Near the lighthouse of Palamos (Gerona) in the Catalonian Coastal Mountain Chain (Spain), aplite-pegmatites occur as sheet dikes in coarsegrained porphyroblastic granites. A chemical similarity exists between granite, aplite, and granite porphyroblasts. Field studies, microscopic examinations, and chemical data suggest that the aplite-pegmatite association developed in two stages by metamorphic and metasomatic processes. (1) Under shearing and crushing, the granite recrystallized into banded aplites containing strings of garnet. (2) During a late tectonic stage, metasomatism in zones of mobilization caused a pegmatitic replacement of the aplite.
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