Mineralogy and Mineral Chemistry of Dioritic Dykes, Quartz Diorite Enclaves and Pyroxene of the Sungun Cu-Mo Porphyry Deposit, East Azerbaijan, Iran

The Sungun Cu-Mo porphyry deposit forms part of the Ahar–Arasbaran Magmatic Belt (AAMB). Its host Miocene stock is quartz monzonitic in composition and cut by intermediate dykes that post-date mineralization. These contain pyroxene enclaves ambiguous origin. Dykes microdiorite are observed within diorite dykes, whereas later three different kinds (diorite, hornfels) sizes between 1 10 cm. Enclaves consist plagioclase, hornblende biotite, with accessory sphene, apatite. Chlorite compositions chamosite range, they clinochlore range enclaves. Microprobe analyses indicate an augitic (Fs13.38-22.79Wo29.1-33.57En48.53-56.61), consistent igneous Hornblende formed at pressures ranging 3 5.3 kilobars temperatures 714 731 °C. Average oxygen fugacity during rock formation −14.75. Such high fugacities suggest near boundaries a convergent margin. Amphibole sub-alkaline to mildly alkaline, reported whole-rock chemistry magmas. Pyroxenes were 11 15 (33–45 km) 1100 1400 amount Fe3+ clinopyroxene also their environment crystallization. Overall, these results have implications for our understanding origin magmas mineral deposits lower-crustal setting.