Kharazmi Journal of Earth Sciences

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Pelitic schists containing high-pressure mineral assemblage were found from the Sanandaj-Sirjan metamorphic belt in northwest of Nahavand city in western Iran. Textural observation as well as chemical analyses of minerals shows that pelitic schists of the Nahavand area recorded two metamorphic stages. The earlier stage (M1) is testified by relicts of pyroxene, glaucophane and phengite inclusions in core of albitic plagioclase and winchite and phengite cores in chemically zoned amphibole and white mica, respectively. While the second stage (M2) is documented by tremolite, chlorite and muscovite in the main schistosity and in the pressure shadow of albitic plagioclase blasts. P-T estimation of M1 and M2 metamorphic stage by using calibrated thermobarometers and Thermocalc software revealed an average pressure and temperature of 15.5 kbar and 575 ^◦C for the M1 stage, whereas the M2 stage has been constrained at P= 4.5 kbar and T= 600 ^◦C. The obtained P-T pattern show a clockwise path in which the high-pressure metamorphic stage of M1 continued by the retrograde low-pressure metamorphic stage of M2. This P-T path could be formed during subduction of Neo-Tethys oceanic plate under Iranian plateau.
 

Keywords:  High pressure pelitic schists, Nahavand, Sanandaj-Sirjan metamorphic belt, Thermobarometry

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