Geochemistry & Hydrothermal Alteration in SorkheCopper Index, Marand

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

      Sheykhdarabad?Abak area is located at 15km south?west of Mianeh in east Azarbaijan, within the western Alborz and Azarbaijan zones. The Eocene volcanic rocks are classified as sub-alkaline basalt, andesite, trachy-andesite also Oligocene rocks as trachyte, dacite, and rhyo-dacite; Based on Winchester & Floyd (1977).
   The faults in the area then have acted as places for the movement of magma and as passages for the migration of hydrothermal Solutions.
   The ore minerals include chalcopyrite, bornite, pyrite, chalcocit, covellite, malachite, azurite, native copper, magnetite and hematite.
   The most common alterations are sericitic, argillic, propylitic and silicification. Geochemical studies (based on Grant 1986) show that in the sericitic zone Cl, S, Cu, Pb and Zn have been added by hydrothermal fluids. MnO, Na2O, Fe2O3, MgO, CaO and P2O5 have been leached out during argillic alteration form a kaolinit rich Zone.

     The Sorkeh Cu deposit is located at 35km Marand E Azarbaijan. There are 3 main hydrothermal alteration zones:propylitic, sericitic and argillic. The geochemical behavior of major and trace elements during variants hydrothermal alteration are discussed here in. These elements are classified into 3 groups: enrichment, depleted and immobile elements. Cu shows the highest enrichment in the propylitic and sericitic zones. It has been fixed in these zone as chalcopyrite, bornit covellit eand malachite. The elements in altered minerals have mainly been leached out from the hydrothermal system.