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Mashhad granites and granodiorites are divided in to three groups based on their ages, mineralogical and chemical composition. 1) Vakilabad - Dehnow - Kouhsangi granodiorites and quartz monzodiorite, 2) Sangbast feldspar granite, and 3) Khalaj - Gheshlagh biotitemuscovite granite.
These plutonic rocks were intruded the northern metamorphic zone, i.e. metamorphosed flushoid sedimentary rocks and ophiolite complex. The Vakilabad Kouhsangi- Dehnow granodiontes and quartz monzodiorite and Sangbast feldspar granite were emplaced after the first low grade regional metamorphism (Hercynian) and before the second low grade regional metamorphism (Middle Cimmerian).
Khalaj biotite-muscovite granites were emplaced during the second regional metamorphism (Middle Cimmerian).
Based on the mineralogical composition, major and trace elements, and magnetic properties all of these intrusives belong to the S-Type granite.
Granodiorites and feldspar granite originated from the lower continental crust in the early stage of collision wheras biotite-muscovite granites originated from middle continental crust contemporaneous with the collision.