Study of Geochemical processes affecting vein-type silicate-sulfide mineralization in Hizejan area(NW-Iran)

Category Engineering Geology
Group GSI.IR
Location 23th symposium on geosciences
Holding Date 05 May 2008

      Hizejan area is a part of Varzeghan 1:100000 geological map, which itself is apart of Alborz-Azarbaijan zone.Cu and other elements mineralization is occurred in this area within the silica- sulfide veins. These veins are formed in the pyroclastic and volcanic rocks in the vicinity of monzonitic dykes. The main alteration is propylitic. Argilic alteration can be seen in lesser amounts which is primary or is enhanced by supergene processes. Probably the main complex carring the element has been bisulfide type and processes such as secondary boiling, dilution, decrease in sulphure content and oxidation have caused precipitation of the minerasls. The main textures in the silica veins are mosaic, comblike, banding, cokade and overgrowth textures. Important feature of this mineralization is its association with volcanic rocks and apparent lack of relation to plotonic rocks. The role of plotonic rocks can be considered as a heat source and probably partial source of sulphur and metals.