BORBOREMA PEGMATITIC PROVINCE - GEOLOGICAL AND GEOCHEMICAL CHARACTERISTICS

The geological features of the pegmatites from the Borborema Pegmatiti c Province (BPP) are described, combining data from the literature wit h new field and laboratory observation. A geochemical study was perfor med against this geological background to test the crystallization mod el of mineralized pegmatites against barren pegmatites and to compare the BPP with other provinces, fields or individual pegmatites througho ut the world. The field evidence (mode of emplacement, textural relati onships, zonation and mineralogy) as well as the geochemical character istics support the pegmatite crystallization model proposed by London (1990). The geochemical and mineralogical evidence places these pegmat ites as ''medium Ta-mineralized'' compared to other pegmatite province s.