Origin of tourmaline in micaschists of ‎Gol-e-Gohar metamorphic complex from south-eastern Sanandaj-Sirjan Zone (Baft, Kerman Province)‎

In Gol-e-Gohar micaschists from south-east Sanandaj-Sirjan zone (Kerman province), there are particular tourmaline crystals and this work, investigates their mode of formation. They enriched in Mg and Na (Mg: 1.830 a.p.f.u and Na: 0.680 a.p.f.u), and so, they are dravite in compositions and they belong to alkaline series. Delineated combinational profiles from core to rim in these tourmalines display a weak compositional zoning. Evidences such as existence of quartz inclusions in these minerals, equilibriated boundaries between the tourmalines and biotites in all cases and orientation of some tourmaline crystals along with other metapelite-forming minerals and weak chemical zoning in them indicate that they formed during or after acting tectonic forces and metamorphic events. Moreover, chemical composition 0f the studied tourmalines, such as F