Borborema Pegmatitic Province: geological and geochemical characteristics

The geological features of the pegmatites from the Borborerna Pegmatitic Province (BPP) are described, combining data from the literature with new field and laboratory observation. A geochemical study was performed against this geological background to test the crystallization model of mineralized pegmatites against barren pegmatites and to compare the BPP with other provinces, fields or individual pegmatites throughout the world. The field evidence (mode of emplacement, textural relationships, zonation and mineralogy) as well as the geochemical characteristics support the pegmatite crystallization model proposed by London (1990). The geochemical and mineralogical evidence places these pegmatites as “medium Ta-mineralized” compared to other pegmatite provinces.