Magma mixing processes appear to be the most important mechanisms involved in the genesis of Mount Hasan magmas, which are derived from the mantle with participation of crustal components. Evidence of fractional crystallization has been encountered in the most recent stage rocks and more generally plays a role in the genesis of Hasan magmas although it does not explain all of the compositional traits. Older volcanic stages also show evidence of subduction influence while the more recent magmas are more indicative of intraplate processes, the effects of crustal extension and of the presence of water. In general, various sources have been proposed for the magmas of the Central Anatolian province.