Petrology of the igneous rocks in the west and south‌west of Razan, Hamedan Province

West and south­west of Razan igneous rocks are located in the Hamedan Province in the Sanandaj- Sirjan zone, west Iran. According to petrography and chemical studies, these rock bodies are composed of diorite, gabbrodiorite, monzonite, quartz- monzonite, andesite and andesibasalt. The results of geochemical analysis show that these rocks belong to a cal- alkaline magma series. The geochemical charactersistics of the rocks in this area have been affected by the magmatic processes such as fractional crystallization, assimilation, rate of partial melting and composition of original rock. Patterns of trace and  rare earth elements normalized to Chondrite and primitive mantle show that LREE contents are sharply higher than HREE. The magma of the intermediate-basic igneous rocks in the west and southwest of Razan have formed in a subducthon zone and volcanic arc active continental margin.