The study of zoning in the pegmatite of Ebrahim Attar area and the chemistry of their minerals (Southeast of Kurdistan)

The study area is located northwest of Iran (38 km SW of Qorveh); which is a part of Sanandaj-Sirjan Zone. The lithology of this pegmatite complex varies from pegmatitic syenogranite to granodiorite, which were intruded in the dolomitic marbels of the area. Field observation, thin sections studies, XRD, XRF and ICP analyses on minerals and rocks in the area show that the composition of these pegmatites vary from the rim to the center. In the center of the pegmatitic dyke, the grains are coarser and concentrations of quartz and feldspar increase, while the mica decreases. The geochemical study on the minerals indicate high amount of Ta (92-93.5 ppm), Tl (9 ppm), Ti (5275 ppm), Zn (668-724 ppm), Ag (29-33 ppm) and Nb (1620-1710 ppm) in biotites and Ga (212-214 ppm), W (33-40 ppm) and Sn (85-87 ppm) in muscovites. Also garnets which exist in pegmatites are almandine-spessartine enriched in Y (1120-1150 ppm) and the amount of HREE/LREE elements in these garnets is high. In the analyzed beryls the amount of Ni (15-17 ppm), V (9-12 ppm), Cu (22-29 ppm) and Cs (108-123 ppm) elements is high.