Writers : Tale Fazel, E.; Mahrabi, B.; Kiyan Poor, R.; Yadollahi, R.
Refference : 27th Symposium on Geosciences and the 13th Symposium on Geological Society of Iran
Publishing Year : 1388

Abstract :

The Dardvey iron ore deposit was the one of the mine in Sangan mine deposits which due to the high grades, low P and S content and high reserves, is a major iron ore in Iran. The important anomalies in Sangan consist of East, Central and West anomalies that Dardvey deposit is a typical magnetite-rich skarn developed along the contact of Sarnovvsar I-type granite intrusive body formed in Central anomaly. Paragenetic sequence and fluid inclusion studies show three stages of mineralization includes; 1) emplacement of granitic rocks in ranges of 320 to 520°C and 0.5 kb pressure, 2) skarn mineralization zone consist of prograde stage developed within the temperature ranges of 310 to 490°C with average salinity of 33.6 (wt.% NaCI), in association with metasomatic mineralization during a retrograde stage, developed within temperature ranges of 190 to 310°C with average fluid salinity of 13.6 (wt.% NaCI) accompanied with magnetite ore and massive pyrite, chalcopyrite and pyrrhotite and 3) vein-type mineralization and barren veins includes vein and vein let pyrite, chalcopyrite phologopite bearing veins consist of two sub stages with fluids of 360 to 440°C with average salinity of 33.4 (wt.% NaCI) and 235 to 320°C with average salinity of 14.6 (wt.% NaCI) in skarn zone and intrusive body. Considering fluid inclusion homogenization to vapor phase, occurrence of vapor-rich fluid inclusion and spread ranges of salinity, it conclude that may be boiling and fluid mixing, were the possible mechanism for ore-metal deposition and formation of hydrothermal vein and veinlets in last stage of mineralization in the area.

Subject List : Iron