Physicochemical conditions of granitoids amphibole crystallization in Hararan (part of Lalehzar granitoid complex in Baft city, Kerman Province)

The Laleh-Zar granitoid complex is one of the most important magmatic phases of the Urumieh-Dokhtar belt and is located in the southeast of this belt in Kerman Province, which has a combination of granite and gabbrodiorite. Parts of this vast complex is exposed in the southern part of Hararan region. Based on petrographic studies, these igneous rocks are granodiorite, diorite, and dacite with quartz, plagioclase, amphibole, biotite, pyroxene, and opac minerals. The secondary minerals of chlorite, calcite, epidote and sericite are also present in these igneous units. The results of mineral analysis, using microprobe method, showed that amphiboles are calcite and hornblende. these amphiboles are igneous and belong to the calc-alkaline magmatic series and are of S type (subduction Amphiboles), which are formed in the subductions environment. The pressure and temperature during the formation of these amphiboles were calculated by different methods, therefore the temperature was 650 to 798 degrees Celsius and the pressure was 0.9 to 2.3 kbar. In addition, these amphiboles have high oxygen fugacity and were created at the depths of 9 to 14 kilometers of the earth. Based on the relationships between different elements in these amphiboles, the conducted studies showed that tschermakite and adenitic successions occurred in these amphiboles, but glaucophane, riebeckite and richterite successions did not occur in these amphiboles.