An overview to W- mineralization in the eastern part of Boroujerd granitoidic complex (Western Iran)

Abstract

Boroujerd granitoidic complex with Middle Jurassic age, and approximately 180 to 200 Km² in area, is a part of Sanandaj-Sirjan zone (Western Iran). This complex consists of  mainly three units including qaurtzdiorite, granodiorite and monzogranite. It is accompanied by sphene granitic stocks, pegmatitic and aplitic dykes and mineralized quartz-tourmaline veins. Field studies, petrography and mineralography of the mineralized veins is the aim of this paper. Host granitic and metamorphic-sedimentary rocks have been intersected by quartz-tourmaline veins with 0/5 to 2 thickness and general trend NW-SE. gangue part of these veins includes minerals such as  quartz, tourmaline, biotite, calcite and dolomite. Scheelite, arsenopyrite, pyrite, pyrrhotite,  chalcopyrite, malachite, azurite, sphalerite, covelite and goethite are the ore part of these veins. At the studying area, scheelite exists as primary ore from hydrothermal and probably magmatic origin. Scheelite accompanied by tourmaline, arsenopyrite and chalcopyrite and exsolution in sphalerite and Abundant fractures in pyrite and arsenopyrite  with cataclastic texture indicate that scheelite was formed at high temperature and pressure