Variscite occurrence in Kushk deposit, Bafg (Yazd Province)

Abstract

Kushk Deposit is located in the Central Iran tectonic zone and is a part of the Bafg block (Bafg-Saghand Belt). öDezu Formation in the Kushk area are widespread occurrence The Dezu Formation in the Kushk area is of widespread occurrence and includes terrigenous, carbonate and volcanic rocks. The black shale, which belongs to the Dezu Formation hosts Pb-Zn mineralization (Galena, Pyrite, Sphalerite). Variscite is formed generally as nodules, open space filling and veinlets in ore bearing parts of deposit. In supergene environment, oxidation of sulphide minerals releases H2SO4 bearing fluids. The leaching of Al(OH)3 and phosphates from the host rock in acidic environment and reactions between them produce Variscite.