University of Isfahan Petrological Journal 2228-5210 10 1 2019 05 22 Volcanological and Geochemical Features of the Products of Sabalan’s Last Eruption, NW Iran Volcanological and Geochemical Features of the Products of Sabalan’s Last Eruption, NW Iran 125 146 23796 10.22108/ijp.2019.115533.1119 FA Reza Fahim Guilany Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran Seyed Jamal SheIhk Zakariaee Department of Geosciences, Science and Research Branch, Islamic Azad University, Tehran, Iran Ali Darvishzadeh Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Mansour Vosoughi Abedini Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran Journal Article 2019 02 09 Sabalan volcano is located in the northwest part of Iran and 25km south of Meshkinshahr in the west Alborz-Azerbaijan structural zone. The rocks forming the Sabalan and its eastern and northern slopes are covered with significant amounts of white-gray pyroclastic deposits, which is indicating a very intense explosive activity at the last stage of this huge volcano activity. After conducting field studies and analyzing the results obtained using the mathematical calculations, a Plinian eruption was detected, and the extrapolated volume of the latest pyroclastic fall eruption was estimated 3.24 km3, and the eruption of Sabalan rated a VEI of 5. Also, due to the shape of the isopach curve, the role of wind in dispersing these deposits is from the west to the east. Also based on geochemical data, the Sabalan’s ignimbrite was rhyodacitic with calc-alkaline signatures and the high ratios of Ba/Nb>28 and Ba/Ta>450 are consistent with subduction related zone. Sabalan volcano is located in the northwest part of Iran and 25km south of Meshkinshahr in the west Alborz-Azerbaijan structural zone. The rocks forming the Sabalan and its eastern and northern slopes are covered with significant amounts of white-gray pyroclastic deposits, which is indicating a very intense explosive activity at the last stage of this huge volcano activity. After conducting field studies and analyzing the results obtained using the mathematical calculations, a Plinian eruption was detected, and the extrapolated volume of the latest pyroclastic fall eruption was estimated 3.24 km3, and the eruption of Sabalan rated a VEI of 5. Also, due to the shape of the isopach curve, the role of wind in dispersing these deposits is from the west to the east. Also based on geochemical data, the Sabalan’s ignimbrite was rhyodacitic with calc-alkaline signatures and the high ratios of Ba/Nb>28 and Ba/Ta>450 are consistent with subduction related zone. https://ijp.ui.ac.ir/article_23796_2b6ae66a3ede193a71f60963a168fc59.pdf