Characteristics of the Eocene Volcanism in Taroum Mountain, West Alborz of Iran and Comparison with the Similar Volcanism in Yuntdağ Area of Turkey

The west Alborz area with a crustal thickness of 35-40 Km is a part of the Alborz ranges and is located in the western part of the Alpine- Himalaya belt. This area is folded by Alpine orogeny and the orogen is formed by collision between Iranian and Arabian blocks. A thick and widespread sequence of volcanic and pyroclastic rocks with 3800m thickness, Eocene in age, outcropped in west Alborz (Karaj Formation, KF). These rocks are intruded by younger plutons with Tertiary age. There are numerous geological, petrological, stratigraphical, geochemical and tectonical similarities between Miocene volcanic rocks in Turkey and study area in Iran (Eocene). The only difference is in age of volcanism in Turkey and Iran.