The study of Re content and crystal structure of molybdenites from Sar Cheshmeh deposit, and comparison with other porphyry deposits of the world

The Re content was determined in monomineralic molybdenite separates from veinlets. Mineralogical data and chemical analyses indicate two generations of veinlet molybdenites in the Sar Cheshmeh deposit. The first generation (molybdenite I) which contains low Re, is found as intergrowth with quartz, small grain size, and the second generation (molybdenite II) which contains high Re, is found in veinlets with low quartz content. There is a positive correlation between the elevation of molybdenite deposition and Re content in molybdenite samples from the Sar Cheshmeh deposit. Decrease in the temperature and pH of the hydrothermal fluids are effective for the accumulation Re in molybdenite. XRD study of molybdenite samples indicate that the molybdenites (high and low Re) are of the 2H polytype. The Re concentration in Sar Cheshmeh deposit was compared with other porphyry deposits worldwide.