Document Type : Original Research Paper
Author
Assistant Professor, Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran
Abstract
Many centres within Iran are Plio-Quaternary in age and so formed 10s of millions of years after initial Arabia-Eurasian collision. Both composite volcanoes and lava fields present from Anatolia to eastern Iran. Basaltic rocks from Maku in the northwest Azerbaijanprovince of Iran are part of a widespread series of Pliocene-Quaternary mantle-derived magmas erupted within the Turkish-Iranian orogenic plateau. A wide range of compositions has already been identified. Rock types span the range from primitive basalts to rhyolites with rare potassic and ultrapotassic lavas. Therefore, detail petrological studies and age dating on the Quaternary volcanism in NW of Iran, on the eastern of this plateau are very important. This paper presents new 40Ar/39Ar ages for lavas in the northwest Iran and compare them with the other young volcanoes, within the eastern Turkey (Anatolia); for example, Ararat (Agri Dagi), Tendürek and YigitDagi. These young volcanoes were erupted some of lava flows and were covered a big amounts of basaltic materials in eastern Turkey and also from N-Maku to Salmas and western of Urumieh lake (~200 km) during a short time in the Quaternary. This young basic to intermediate rocks are generated from the Ararat, Tendürek and YigitDagi. The variations in the lava chemistry of the Quaternary volcanic rocks indicate a geochemical progression from calcalkaline to more alkaline compositions in time and a spatial shift from north (Maku samples) to south ( Salmas samples) towards the Arabian plate. These lavas were erupted from a thick crust and thin mantle lithosphere within the Turkish-Iranian plateau, beginning at ~10 Ma.. The ranges dating of these basaltic lavas are, between ca. 1.87 and 0.40 Ma. These aging data indicate more exactly aging which were published in Turkey and the Yigit Dagi is determined ageing, which were not aging before. It will allow a complete picture of magmatism across an entire this part of Turkish-Iranian plateau by determination ages of the lava flows in northwest of Iran with comparing of the same flows in eastern Turkey
Keywords
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