Economic Geology of Copper-Gold Deposit, Masjid Daghi Area
|Category||Economic geology & mineral exploration|
|Location||The 24 Symposium of Geosciences|
|Holding Date||15 August 2007|
The Copper-Gold deposit of Masjid Daghi Area is located in the EastAzarbaijanProvince in north -west Iran. The outcropping rocks are andesite, trachyandesite and quartz mostly resulting from Tertiary volcanic and volcano- sedimentary activities which have affected the region and intersected by Late Eocene intrusives.
Mineralographic studies have shown that the mineralization in the area is copper sulfide type in the form of veins, veinlets and stockwork. Mostly pyrite is seen with amounts of chalcopyrite and chalco-pyrrhotite increasing with depth. Paragenetic observations of gangue and alteration surrounding the veins indicate the presence of gold bearing epi-thermal veins with high sulfide content. Native gold mineralization is seen to occur in the siliceous zone and the host rock of the veins as well as in the form of inclusions (about 15 microns) in chalcopyrite. This phenomenon is being reported for the first time from this area. Lead and Zinc mineralization is present in the body of the vein but not in the altered zone. Very small amounts of molybdenite is present adjacent to the veins and stockwork. Alteration types present in the area are potassic, phyllic, carbonate-phyllic, argillic and propylitic. Furthermore, selective sercitic, sericitic-chloritic and alunitic alterations are seen around the mineralized veins