Study of the source and geothermobarometry of Shah Jahan granodiorite and granite plutons: by using unstable isotope data, dating and geochemistry

The Shah Jahan Granodiorite and granite rocks are part of the Ordubad granitoid body that outcrop in 10 km south of Aras River. These rocks are located in the Alborz-Azerbaijan zone in NW of Iran. The Granodiorite Pluton has granular texture; containing minerals are plagioclase (andesine), alkali feldspar (orthoclase), amphibole (magnesio-hornblende) biotite, titanite and magnetite. Alkali feldspar minerals in granodiorite pluton are less than granite pluton. The Initial rate of 87Sr / 86Sr =0.704486 in granodiorite and 87Sr / 86Sr =0.704432 in granites rocks and positive εNd value indicate to mantle origin and subduction-related area. The emplacement age of these rocks is related to the Eocene based on Ar-Ar by biotite minerals. Base on mineral chemistry of biotite, amphibole and whole rock geochemistry: these plutons are meta-aluminous, I-type granites and related to calc-alkaline magma series. Negative Nb and Ti anomalies in normalized graphs can be shown subduction-related zones. P-T replacement of the granodiorite rocks are estimated of 1.08 to 1.91 Kbar and 753 to 777 °C.