A view to geochemistry of Angouran ore deposit, SW Zanjan
|Location||23th symposium on geosciences|
|Holding Date||05 May 2008|
Angouran ore deposit is located in 125 km of SW of Zanjan. During the tertiary, geothermal- hydrothermal volcanic activities caused extensive alterations in the Angouran ore deposit and major primary sulfide ores altered to oxide (carbonate) ores. Main sulfide minerals are sphalerite and galena and some pyrite and arsenopyrite, while main carbonate minerals are smithsonite, hemimorphite and cerussite. This ore deposit could be classified to nonsulfide supergene deposit as formed by direct replacement.
Average of zinc grade is 28.43 % and lead is 4.55 %. Grade of zinc in sulfide ore is 38.91 % and in carbonate ore is 26.49 %. Grade of lead in sulfide ore is 2.05 % and in carbonate ore is 4.95 %. Estimated resources of the ore deposit is more than 15 Mt. Geochemical studies indicate that value of Pb, Mn, As and Sb in carbonate ore is more than sulfide ore; Inversely value of Zn, Hg, Ag and Cu decreases in carbonate ore.