ORIGINAL PAPER Kuh-e Dom Fe–Cu–Au prospect, Anarak Metallogenic Complex, Central Iran: a geological, mineralogical and fluid inclusion study Ebrahim Tale Fazel & Behzad Mehrabi & Amir Ali Tabbakh Shabani Received: 7 June 2014 /Accepted: 30 October 2014 /Published online: 18 November 2014 # Springer-Verlag Wien 2014 Abstract The Kuh-e Dom Fe–Cu–Au prospect is located in the Urumieh-Dokhtar Magmatic Belt, and is characterized by copper–iron oxide and gold veins, stockworks and breccias hosted by the Eocene Kuh-e Dom arc intrusion. Mineraliza- tion is located within NE–SW to WNW–ESE sinistral faults and likely formed in a subduction-related continental margin that is typical of IOCG deposit systems. The deposits have a distinct metal composition of Fe, Cu, Bi, Co, Mo and LREE with gold (up to 3 g/t), and the mineral assemblages are quartz, hematite, pyrite, chalcopyrite, emplectite, magnetite, free gold, calcite, barite, chlorite, and tourmaline. Three parage- netic stages of mineralized quartz veins are distinguished in the Kuh-e Dom prospect, including: (i) hematite-bearing quartz veins, (ii) quartz-sulfide stockwork and breccia veins, and (iii) quartz-calcite±sulfide infilling veins. Sodic (albitization), potassic, and quartz–calcite±chlorite pervasive alterations are commonly associated with these three mineral- ization stages. Three types of fluid inclusions have been identified at Kuh-e Dom, including: aqueous two-phase (H 2 O-NaCl-CaCl 2 ±FeCl 2 ), halite-saturated aqueous (H 2 O -NaCl±KCl), and CO 2 -bearing (H 2 O– CO 2 ±CH 4 and CO 2 ±CH 4 ) fluid inclusions. A hypersaline (~35 wt% NaCl equiv.), aqueous magmatic fluid was released at about 400 °C and a pressure of nearly 4 kbar, forming early hematite- bearing quartz veins. These high salinity fluids were progres- sively diluted further away from Kuh-e Dom intrusion due to substantial input of meteoric water and mixing with the mag- matic components during the middle and late stages of min- eralization. The mineralogy, alteration, and fluid composition of the Kuh-e Dom Fe–Cu–Au prospect compared well with Fe oxide Cu–Au (IOCG) deposits worldwide. Introduction The Kuh-e Dom gold prospect is located approximately 110 km northeast of Ardestan in the middle part of Urumieh-Dokhtar Magmatic Belt (UDMB) (Fig. 1). There are three main metallogenic provinces in the UDMB; (1) Takab Metallogenic Province (TMP) (Mehrabi et al. 1999; Richards et al. 2006; Daliran 2008); (2) Kerman Porphyry Cu Belt (KPCB) (Dimitrijevic 1973; Hassanzadeh 1993; McInnes et al. 2003; Hou et al. 2011); and (3) Anarak Metallogenic Complex (AMC) (Technoexport 1981; Yushin and Romanko 1981; Romanko et al. 1984; Mehrabi and Rabiee 2005). The Kuh-e Dom prospect is located in the northern part of the AMC (Fig. 1). The polymetallic mineralization occurs mostly as hydrothermal vein-type base and precious metal deposits and skarn type in the AMC. Temporally and spatially, these metallic deposits are closely associated with major Eocene magmatic activity and have a mineralization age of 34 Ma (Yushin and Romanko 1981). The gold deposits in the UDMB can be divided in to epithermal (e.g. Sari Gunay: Richards et al. 2006; Agdarreh: Daliran 2008) and Carlin types (e.g. Zarshuran: Mehrabi et al. 1999; Asadi et al. 2000), as well as by-product of porphyry Cu-style deposits (e.g. Sarcheshmeh: Porter 1998; Shafiei and Shahabpour 2008). Technoexport Co. carried out detailed regional scale inves- tigations of the geology and structural features in the Anarak area, including Kuh-e Dom prospect area between 1975 and 1985. Mineralization in the Kuh-e Dom prospect was origi- nally identified in 1975 by Technoexport Co., that outlined favorable drilling targets based on regional field mapping, stream sediments, channel sampling, and a geophysical sur- vey carried out by Pichab Kavosh Consultant Engineering in Editorial handling: P. S. Garofalo E. Tale Fazel (*) : B. Mehrabi : A. A. Tabbakh Shabani Department of Geochemistry, Faculty of Earth Sciences, Kharazmi University, Tehran, Iran e-mail: tale.fazel@gmail.com Miner Petrol (2015) 109:115–141 DOI 10.1007/s00710-014-0354-2