Mineral chemistry and P-T estimation of formation of garnetschist Mount Argon (west of Angoran Mine)
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Keywords: Mineral chemistry Metapelitic rocks Mount Argon North West of Iran.,
Abstract :
The Mount Argon garnet schists contain mineral assemblages of quartz, feldspar, mica and garnet. The chemical composition of, plagioclase, biotite, muscovite and garnet in the studied sample shows that plagioclases are albite-rich, white mica flakes are rich in muscovite end-member, phlogopite-annite is the dominant constituent in biotite and chemical composition of the analysed garnets shows that they are almandine and spessartine-rich. Maximum and minimum pressure and temperature of the studied rocks were estimated by using common calculation methods. The minimum and maximum temperature of metamorphism was calculated using Mg-Fe exchange between garnet and biotite. Considering a nominal pressure of 4 kbar, the highest calculated temperature was 615C and the lowest temperature was 380C. These were 644C and 392C for pressure of 8 kbar respectively. Also using multi-equilibria calculations, temperature of 800C and pressure of 9kbar were obtained for the peak of the metamorphism and temperature of 450C and pressure of 7kbar was calculated for the lower part of the metamorphism. . Two phases of metamorphism and deformation affected these rocks. The second deformation was associated with the peak of metamorphism. A decrease in temperature about 351°C with reduced pressure of about 2 Kbars is observed in the metapelitic rocks.
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