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 tourmaline crystals which are 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 belonging to alkaline series. The delineated combinational profiles from core to rim from these tourmalines display a weak compositional zoning. Evidences such as the existence of quartz inclusions in these minerals, equilibriated boundaries between the tourmalines and biotites in all cases and the 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 of the studied tourmalines, such as