TY - JOUR ID - 153976 TI - Petrography and application of mineral chemistry and thermobarometry of amphibolites in Jandaq metamorphic complex: Evidence of paleo-tectonic events in Central Iran JO - Scientific Quarterly Journal of Geosciences JA - GSJ LA - en SN - 1023-7429 AU - Heidarianmanesh, Arefeh AU - Tabatabaimanesh, Seyed Mohsen AU - Shirdashtzadeh, Narges AD - Department of Geology, Faculty of Science, University of Isfahan, Isfahan, Iran Y1 - 2022 PY - 2022 VL - 32 IS - 4 SP - 119 EP - 142 KW - Mineralogy KW - Thermobarometry KW - Amphibolite KW - Jandaq Metamorphic Complex DO - 10.22071/gsj.2022.329201.1981 N2 - Based on field observation and petrographic evidence, by progress in metamorphic degrees, a wide variety of metabasites have formed following the metamorphism at amphibolite facies (metamorphism M1) in the east of Jandaq. Thermobarometry of plagioclase- amphibole pairs indicate temperature ranges were 642-692ºC  and 688-712 ºC for epidote amphibolites and garnet amphibolite, respectively, in a pressure range of 8 and 11 Kbar, correlating with transition from middle amphibolite to upper amphibolite facies. In addition to this metamorphic phase, petrographic signatures indicate further metamorphic phases concerning this region's geological phenomena. Based on brittle deformation in amphiboles, and epidote and quartz formation in their fractures, these rocks have undergone some degrees of retrograde metamorphism (<700 ºC; metamorphism M2) at greenschist to lower amphibolite facies. Rock foliation and mineral orientation, aggregate shape preferred orientation (ASPO) of titanite crystals along foliation, and syn-tectonic euhedral garnets indicate prograde metamorphism toward amphibolite-upper amphibolite facies (metamorphism M3). Finally, under greenschist facies condition, minerals such as chlorite and actinolite were formed in these rocks (metamorphism M4). The formation of chlorite and actinolite in the rims of the primary crystals shows that these rocks were finally affected by metamorphism at greenschist facies (M4 metamorphism). UR - http://www.gsjournal.ir/article_153976.html L1 - http://www.gsjournal.ir/article_153976_549b9a5129d22e843f34a62a3a7a6b04.pdf ER -