University of Isfahan Petrological Journal 2228-5210 5 19 2014 11 22 Petrography and mineral chemistry of alteration zones in the Kahang porphyry Cu-Mo deposit (Northeast of Isfahan) Petrography and mineral chemistry of alteration zones in the Kahang porphyry Cu-Mo deposit (Northeast of Isfahan) 1 20 16180 FA Farimah Ayati اصفهان- سه راه سیمین- کوچه جنب اداره مالیات- مجتمع شهاب- واحد 3- آیتی Hashem Bagheri Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Hooshang Asadi Harooni Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran Mahmoud Khalili Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Salimeh Sadat Komeili Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Journal Article 2016 06 14 The study area is located in the Uromieh-Dokhtar volcanic belt and composed of andesite-basalt, andesite, dacite and quartz-monzonite as volcanic and subvolcanic. The occurrence of phyllic, argillic and propyllitic alterations point to the presense of hydrothermal fluids. The studied amphiboles have tschermakite and ferro-edenite composition. The compositional changes from core (Fe-Mg-Mn) to rim (calcic) refer to the variation of physico-chemical condition of magma in the last stage of crystallization. The biotites are assumed to be primary, their Fe/Fe+Mg ratio is over than 0.33% and they are iron enriched. The composition of the chlorites plotted in the repidolite field with Fe and Si in the range of 6.56% to 6.76% and 5.19% to 5.61% respectively. The low content of Al+Fe3+ in sphene, can be the result of high temperature of its formation. The potassium content of the Kahang jarosites is more than that of the sodium indicating the hydrothermal-magmatic condition of these phases formation. The study area is located in the Uromieh-Dokhtar volcanic belt and composed of andesite-basalt, andesite, dacite and quartz-monzonite as volcanic and subvolcanic. The occurrence of phyllic, argillic and propyllitic alterations point to the presense of hydrothermal fluids. The studied amphiboles have tschermakite and ferro-edenite composition. The compositional changes from core (Fe-Mg-Mn) to rim (calcic) refer to the variation of physico-chemical condition of magma in the last stage of crystallization. The biotites are assumed to be primary, their Fe/Fe+Mg ratio is over than 0.33% and they are iron enriched. The composition of the chlorites plotted in the repidolite field with Fe and Si in the range of 6.56% to 6.76% and 5.19% to 5.61% respectively. The low content of Al+Fe3+ in sphene, can be the result of high temperature of its formation. The potassium content of the Kahang jarosites is more than that of the sodium indicating the hydrothermal-magmatic condition of these phases formation. https://ijp.ui.ac.ir/article_16180_7ccf65b80d1c9dc28895dddcbc0ae83b.pdf