A review of the geological, tectonic and metallurgical status of hydrothermal-magmatic deposits of copper (± gold) in Saveh-Razan region
Executor of project: Dr. Seyed Mehran Heidari
Project Associates: Eng. Sars Safavi _ Eng. Azra Hasanlou
Saveh-Razan copper (± gold) zone, with WNW trend in the northwest of Urmia-Dokhtar magmatic belt, had the most reaction to sinistral shear zones by changing the structural trend during the Oligo-mocene, leading to the placement of subvolcanic Oligo-mocene diorite in the shallow and Eocene volcanic rocks.
This system focuses mineralization in the form of siliceous veins, hydrothermal breccia and with sulfides by creating various types of intrusive-related hydrothermal alterations (propylitic, intermediate-advanced argillic, phyllite and silice) along fractures. Sulfides such as pyrite, chalcopyrite, bornite, chalcocite and sulfosalts in the relevant reserves, as well as higher amounts of gold than silver in them are other common metallugeny features of this area. The molybdenum and bismuth show the highest correlation with copper, which refers to the role of sulfide complexes and magmatic fluids in its formation. Fluid homogenization temperature and salinity range between 150 to 350 ° C and 6 to 25%.
The characteristic features of this area are most similar to the intermediate type epitermal deposits that are formed in calc-alkaline magmatic arcs. Therefore, the study of these deposits in order to explore copper-gold porphyry deposits in depth, introduces this area as a suitable exploration target.
Keywords: Metallogeny, Intermediate sulfidation epithermal, hydrothermal-magmatic deposits, Saveh-Razan area.