Thermo-barometery of the granodiorite intrusion of the Qorveh granitoid complex (SE Kurdistan Province)

In south of Qorveh, an I- type granitoid batholith is located which consists of Qz-diorite, diorite, granodiorite and granite units. Microprobe analyses of amphibole crystals in the granodiorite unit reveal that amphiboles fall in the magnesio-hornblende group with contents of Mg/ (Mg+Fe+2) > 0. 5, (Na+K) A< 0. 3 and 6. 5 < TSi< 7. 5 (p. f. u.). Moreover, the low content of Al2O3 and Altotal (p. f. u.) >1. 3, and the high content of TiO2 (0. 98-0. 87), as well as Ti> 1 in p. f. u. reflect the low-pressure. Based on the application of Al - in hornblende, the hornblendes of this unit were crystallized in 2. 1-1. 7 Kbar pressure. Also, Al total / Ti and Al total /Ps diagrams indicated polybaric crystallization of magma during ascent through the crust. Using appropriate hornblende- plagioclase thermometer shows the granodiorite intrusion has average temperature of 697-681°C in this pressure that it is obtained for the emplacement of granodioritic magma. In hornfels, "biotite- garnet" pair shows that maximum temperature is 537-438 ْْC.