Geochemistry and Fluid Inclusions Studies of Low-Sulfidation Epithermal Gold Mineralization in the Mirkuh Ali Mirza Area, Sarab, NW Iran

The Mirkuh Ali Mirza gold mineralization is located in north Sarab in the Western Alborz Azerbaijan structural zone. Mineralization was formed in the form of a vein occurring in Neogene dacitic and rhyodacitic tuff along a series of NW–SE trending fault; Mineralization associated with quartz-sericite-adularia-calcite and pyrite(<1%) assemblages is a typical of low sulfidation epithermal gold mineralization. The fluid inclusion data from quartz minerals indicate homogenization temperature of 161-260°C and salinities of 0.5 to 6.5 wt% NaCl equiv. The variation in gold grade in quartz vein is 270-3240 ppb. The highest gold content is in lattice and breccias quartz that can indicate direct relationship between boiling to gold deposition. The idea is supported by coexistence of vapor dominant and liquid-dominant fluid inclusions.