The south Qorveh granitoid plutons (Kurdistan) which have intruded into the regionally metamorphosed rocks (Kimmerian Orogeny) lie in 80 km NW of Hamedan city. They composed predominantly of granodiorite and granite with minor amount of diorite and gabbro. Field characteristics (i.e. absence of migmatite), as well as several petrographical and geochemical features including the presence of Ca-plagioclase, magnesio-hornblende, and the lack of Al-bearing minerals (i.e. corundum, muscovite), the ASI>1, mol Na+K>mol Al, ratio Na2O+K2O-CaO/SiO2, decrease of P2O5 in Harker diagram, as well as high abundances of Na and Ca are in favor of I- composition of the parent magma. To determine the tectonic setting of the Qorveh granitoid plutons, several diagrams are used including Rb/10-Hf-Ta*30, La/Yb vs. Th/Yb, Th/Ta vs. Yb, spider diagram, and also discriminating diagrams for tectonic environment. Using Agrawall, the studied granitoid has R>0 and so it is an orogenic granitoid. The studied samples generally reflect the volcanic arc setting in active continental margin and it is similar to late- orogenic granitoids. Investigation of tectonic setting and age of granitoids in Sanandaj-Sirjan Zone (SSZ) show that the granitoid developed by subduction of Neo-Tethyan oceanic crust underneath Central Iran.

Ayoub Ansar volcanic dome is located about the 25 km southeast of the Takab, in the central part of the Takab geological map in 1: 100000 scale. This area is a part of Central Iranian Zone at the junction of Sanandaj-Sirjan and Central Iranian Zones. Ayoub Ansar volcanic dome intruded into the marl and sandstones of Miocene. This volcanic dome croups out in E-W trend with a length of about 4. 5 km and width of about 2. 5 km. Based on petrographic studies, Ayoub Ansar volcanic dome has dacitic-rhyodacitic composition. These rocks have porphyritic, felsophyritic and golmero-porphyritic texture with plagioclase, amphibole and quartz phenocrysts. Based on geochemical evidences, these rocks are high-K calc-alkaline, metaluminous to peraluminous and classified as Itype granitoids. These rocks demonstrate REE patterns with enrichment in LREE, high LREE/HREE ratio and without negative Eu anomalies which indicate that plagioclase didn’ t underwent fractionation. Enrichment in K, Rb and Ba and negative anomalies for HFSEs such as Nb, Ta and Ti in the spider diagrams indicate influence of the continental crust for the formation of parent magma. Based on tectonic setting discrimination diagrams, these rocks formed in the volcanic arc and Syn-collisional to post-collisional setting. The studied dacites demonstrate geochemical features like Adakites.