Gold Genesis in Safikhanlu?Noghdoz Prospecting Area

Category Economic geology & mineral exploration
Group GSI.IR
Location 21th symposium on geosciences
Holding Date 21 May 2008

      Exploration area of Safikhanlo ? Noghdoz with Km2 is located in 25km southeast of Ahar city in Azarbaijan province in NW of Iran.
   The oldest geological unit in the studied area is composed of volcanic rocks with intermediate composition of Upper Eocence-Pliocene rhyolite, rhyodacitic domes which occurred in eastern part of the area. Upper Eocene volcanic rocks with intermediate (andesitic) composition has been intruded by intrusive rocks with monzogranitic to Alkali granite composition the complex has been crossed by dikes with acidic composition (rhyo-dacite). Mineralization is controlled by normal faults and faulty zones. The paragenetic minerals of veins are mostly composed of quartz- pyrite- marcazite- chalcopyrite- gold and secondary iron hydroxides. Well developed alteration in the studied area contains silicic- argilic- sercitic and porpyritic alteration, and alteration in the margin of veins and mineralized zones contain silicic- oxidation- argilic and advanced argilic alteration.
   The maximum gold content found up to now is 17ppm. Heavy mineral studies on the concentrated sample revealed that gold drains are accompanied by iron oxide (limonite).
   Fluid inclusion investigations exhibit that the gold is transported as Au(Hs)2- complex and is deposited under oxidation and reduction of soluble sulfur activity.
   On the whole, with regard to available documents, the mineralized veins and zones of the area is related to intrusive rocks which in some parts significantly resemble epithermal acidic- sulfate or high sulfidation gold deposits.