University of Isfahan Petrological Journal 2228-5210 3 12 2013 02 19 Applicatiom of mineralography and fluid inclusion data to determine the formation conditions of porphyry copper deposit, NE Arak Applicatiom of mineralography and fluid inclusion data to determine the formation conditions of porphyry copper deposit, NE Arak 15 32 16118 FA Farimah Ayati اصفهان- سه راه سیمین- کوچه جنب اداره مالیات- مجتمع شهاب- واحد 3- آیتی Houshang Asadi Harouni Hashem Bagheri Mahin Mansouri Esfahani Journal Article 2016 06 14 The Dalli area located northeast of Arak and lies in the Urumieh-Dokhtar magmatic belt. The mineralized area is hosted by volcanic-subvolcanic bodies comprising of diorite-quartz diorite andesite to dacite rocks that intruded into the andesit and pyroclastic rocks. Three main alteration zones including potassic (secondary biotite, magnetite and secondary orthoclase), phyllic (sericite, quartz and pyrite) and propylitic (calcite, chlorite and epidote) are recognized in this area. The geological, geochemical and fluid inclusion investigations show that mineralization in the studied area is of gold-rich porphyry copper type. Gold is observed as an inclusion within chalcopyrite and silicic veins. Fluid inclusion studies in silicic veins show that the homogenization temperature and the salinity is about 180 to 600 ºC and 26 to 70% wt NaCl respectively. The temperature and salinity of fluids decreases from potassic to phyllic alteration zone consistent with other Cu porphyry deposits in the world. The Dalli area located northeast of Arak and lies in the Urumieh-Dokhtar magmatic belt. The mineralized area is hosted by volcanic-subvolcanic bodies comprising of diorite-quartz diorite andesite to dacite rocks that intruded into the andesit and pyroclastic rocks. Three main alteration zones including potassic (secondary biotite, magnetite and secondary orthoclase), phyllic (sericite, quartz and pyrite) and propylitic (calcite, chlorite and epidote) are recognized in this area. The geological, geochemical and fluid inclusion investigations show that mineralization in the studied area is of gold-rich porphyry copper type. Gold is observed as an inclusion within chalcopyrite and silicic veins. Fluid inclusion studies in silicic veins show that the homogenization temperature and the salinity is about 180 to 600 ºC and 26 to 70% wt NaCl respectively. The temperature and salinity of fluids decreases from potassic to phyllic alteration zone consistent with other Cu porphyry deposits in the world. https://ijp.ui.ac.ir/article_16118_dfc9dde851c6c51cdb90a63fabc84ba9.pdf