Comparison of mineralization of the Sungun and Kighal porphyry copper deposits, NW Iran: with an emphasis on fluid inclusion studies

Document Type : Research Article

Authors

• Tayebeh Ramezani ¹
• Mohammad Maanijou ¹
• Sina Asadi ²
• David Lentz ³
• Naser Pirouznia ⁴

¹ Bu-Ali Sina

² Shiraz

³ New Brunswick

⁴ Sungun Complex

10.22067/econg.v10i2.61340

Abstract

Introduction
Nowadays, more than half of the word’s copper production is obtained from porphyry copper deposits, large (greater than 100 Mt), low- to moderate-grade, disseminated, stockwork-veinlet, carrying at least trace elements, such as molybdenum, gold, and silver (Sillitoe, 1972). Porphyry Cu systems are related to granitoid porphyry intru­sions and adjacent wall rocks and most of them form at convergent plate margins (John et al., 2010). The deposits are often localized within calc-alkaline porphyry magmatic systems in subduction zone settings. Some PCDs have been formed in post-subduc­tion settings. Ahar-Arasbaran metallogenic zone is one of the most productive metallogenic zones in Iran. Mineralization in the area is mainly associated with Tertiary magmatic events. In order to perform a comparative study of mineralization, Sungun and Kighal porphyry copper deposits (PCDs) were selected. The Sungun copper deposit is located in the north Varzaqan and the Kighal copper deposit lies 10 km to the south of the Sungun PCD (Calagari, 2003; Calagari, 2004).
 As recent studies show there are some similarities between the Sungun and Kighal deposits in terms of the parent intrusions, the host rocks, age and geological setting. However, the grade of copper in the Sungun PCD is 0.62 % Cu and in the Kighal PCD is 0.2 % Cu. Therefore, what are the key factors that have made the Kighal PCD sub-economic?
 
Material and methods
Geochemical, fluid inclusion, and mineralogical studies were done on collected samples of the two porphyry copper deposits. In order to mineralogically study the Sungun and Kighal PCDs, 100 thin and polished thin sections were prepared. Eleven doubly polished sections of different quartz veins of the two PCD borehole samples were prepared for fluid inclusion studies. The measurements of 205 fluid inclusions were conducted at the Iranian Mineral Processing Research Center (IMPRC) by ZEISS microscope and Linkam TMH600, at temperature limits of -196 to +600 °C. The precision was ±0.6 °C at 414 °C (melting point of Cesium nitrate), and ±2°C at -94.3 (melting point of n-Hexane).  SPSS 17 and Flincor computer programs (Brown, 1989) were used for data analysis.
 
Discussion and Results
In addition to some similarities of parent intrusions and host rocks (Hassanpour, 2010), there are similar fluid inclusion types and even nearly identical salinity and homogenization temperatures in these deposits (Simmonds, 2013). However, some differences in geochemical and mineralogical features, such as different low zonality index, less sulfide minerals and CO2 contents of the Kighal PCD, are notable. Some researchers have pointed out erosion (Hassanpour, 2010) and uplifting (Simmonds, 2013) as the main reasons for the sub-economic nature of the Kighal (non-productivity), comparison of Moho depth in the two deposits shows a greater crustal thickness in the Sungun PCD area (Fig. 10). The thickness of the lower crust is thought to be critical for governing arc mineralization potential, because it leads to an increase of the amount of water, metal, sulfur in adakitic magma forming arc-related bodies that is known to affect the origin of more productive (economic) porphyry copper deposits. Also low-CO2 fluid inclusions of the Kighal can have originated from a CO2-rich fluid immiscibility at depth (Simmonds, 2013). Lack of CO2 can inhibit (delays) bulk volatile saturation and in turn boiling, which influences the efficiency of metal removal from melt as well (Candela, 1997). CO2 contents of mineralizing fluids is important in increasing of pH during boiling event and ore deposition. The non-productivity of the Kighal PCD may have resulted from all these factors.
 
Acknowledgement
This work was supported by Bu-Ali Sina University and Iranian Mines and Mining Industries Development and Renovation Organization (IMIDRO). The authors would like to thank of the Sungun and Ahar copper companies. Special thanks to all the staff for their kind help. Thanks to the reviewers for their suggestions.
 
References
 Brown, P.E., 1989. FLINCOR; a microcomputer program for the reduction and investigation of fluid-inclusion data. American Mineralogist, 74‌(11): 1390–1393.
Calagari, A.A., 2003. Stable isotope (S, O, H and C) studies of the phyllic and potassic–phyllic alteration zones of the porphyry copper deposit at Sungun, East Azarbaidjan, Iran. Journal of Asian Earth Sciences, 21‌(7): 767–780.
Calagari, A.A., 2004. Fluid inclusion studies in quartz veinlets in the porphyry copper deposit at Sungun, East-Azarbaidjan, Iran. Journal of Asian Earth Sciences, 23‌(2): 179–189.
Candela, P.A., 1997. A review of shallow, ore-related granites: textures, volatiles, and ore metals. Journal of Petrology, 38‌(12): 1619–1633.
Hassanpour, S., 2010. Metallogeney and mineralization of Cu-Au in Arasbaran Zone, NW of Iran. Ph.D. Thesis, Shahid Beheshti University, Tehran, Iran, 320 pp.
John, D., Ayuso, R., Barton, M., Blakely, R., Bodnar, R., Dilles, J., Gray, F., Graybeal, F., Mars, J. and McPhee, D., 2010. Porphyry copper deposit model, chap. B of Mineral deposit models for resource assessment, US Geological Survey Scientific Investigations Report, 169 pp.
Sillitoe, R.H., 1972. A plate tectonic model for the origin of porphyry copper deposits. Economic geology, 67‌(2): 184–197.
Simmonds, V., Calagari, A.A. and Kyser, K., 2013. Fluid inclusion and stable isotope studies of the Kighal porphyry Cu–Mo prospect, East-Azarbaidjan, NW Iran. Arabian Journal of Geosciences, Fluid inclusion and stable isotope studies of the Kighal porphyry Cu–Mo prospect, East-Azarbaidjan, NW Iran. Arabian Journal of Geosciences, 8‌(1): 1–17.

Keywords

• Copper Porphyry
• productive
• geochemical halo
• fluid inclusion
• Lithospheric thickness

20.1001.1.20087306.1397.10.2.5.0

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References

Asadi, S., Moore, F. and Zarasvandi, A., 2014. Discriminating productive and barren porphyry copper deposits in the southeastern part of the central Iranian volcano-plutonic belt, Kerman region, Iran: a review. Earth-Science Reviews, 138(1): 25–46.

Asadi, S., Moore, F., Zarasvandi, A. and Khosrojerdi, M., 2013. First report on the occurrence of CO2-bearing fluid inclusions in the Meiduk porphyry copper deposit, Iran: implications for mineralisation processes in a continental collision setting. Geologos, 19(4): 301–320.

Asghari, O. and Hezarkhani, A., 2010. Investigations of alteration zones based on fluid inclusion microthermometry at Sungun porphyry copper deposit NW Iran. Bulletin of the Mineral Research and Exploration, 140(2):19–34.

Asghari, O., Hezarkhani, A. and Soltani, F., 2009. The comparison of alteration zones in the Sungun porphyry copper deposit, Iran (based on fluid inclusion studies). Acta Geologica Polonica, 59(1): 93–109.

Barnes, H.L., 1997. Geochemistry of hydrothermal ore deposits. John Wiley and Sons, Canada, 975 pp.

Brown, P.E., 1989. FLINCOR; a microcomputer program for the reduction and investigation of fluid-inclusion data. American Mineralogist, 74(11): 1390–1393.

Calagari, A.A., 2003. Stable isotope (S, O, H and C) studies of the phyllic and potassic–phyllic alteration zones of the porphyry copper deposit at Sungun, East Azarbaidjan, Iran. Journal of Asian Earth Sciences, 21(7): 767–780.

Calagari, A.A., 2004. Fluid inclusion studies in quartz veinlets in the porphyry copper deposit at Sungun, East-Azarbaidjan, Iran. Journal of Asian Earth Sciences, 23(2): 179–189.

Candela, P.A., 1997. A review of shallow, ore-related granites: textures, volatiles, and ore metals. Journal of Petrology, 38(12): 1619–1633.

Dilek, Y., Imamverdiyev, N. and Altunkaynak, S., 2010. Geochemistry and tectonics of Cenozoic volcanism in the Lesser Caucasus (Azerbaijan) and the peri-Arabian region: Collision-induced mantle dynamics and its magmatic fingerprin. International Geology Review, 52(4-6):536–557.

Graupner, T., Kempe, U., Spooner, E.T., Bray, C.J., Kremenetsky, A.A. and Irmer, G., 2001. Microthermometric, laser Raman spectroscopic, and volatile-ion chromatographic analysis of hydrothermal fluids in the Paleozoic Muruntau Au-bearing quartz vein ore field, Uzbekistan. Economic Geology, 96(1): 1–23.

Groves, D.I. and Bierlein, F.P., 2007. Geodynamic settings of mineral deposit systems. Journal of the Geological Society, 164(1):19–30.

Hassanpour, S., 2010. Metallogeney and mineralization of Cu-Au in Arasbaran Zone, NW of Iran. Ph.D. Thesis, Shahid Beheshti University, Tehran, Iran, 320 pp.

Hassanpour, S., Alirezaei, S., Selby, D. and Sergeev, S., 2014. SHRIMP zircon U–Pb and biotite and hornblende Ar–Ar geochronology of Sungun, Haftcheshmeh, Kighal, and Niaz porphyry Cu–Mo systems: evidence for an early Miocene porphyry-style mineralization in northwest Iran. International Journal of Earth Sciences, 104(1): 1–15.

Heinrich, C., Günther, D., Audetat, A. and Ulrich, T., Frischknecht, R., 1999. Metal fractionation between magmatic brine and vapor, determined by microanalysis of fluid inclusions. Geology, 27(8): 755–758.

Heinrich, C.A., 2005. The physical and chemical evolution of low-salinity magmatic fluids at the porphyry to epithermal transition: a thermodynamic study. Mineralium Deposita, 39(8): 864–889

Hezarkhani, A. and Williams-Jones, A.E., 1998. Controls of alteration and mineralization in the Sungun porphyry copper deposit, Iran; evidence from fluid inclusions and stable isotopes. Economic Geology, 93(5): 651–670.

Jamali, H., Dilek, Y., Daliran, F., Yaghubpur, A. and Mehrabi, B., 2010. Metallogeny and tectonic evolution of the Cenozoic Ahar–Arasbaran volcanic belt, northern Iran. International Geology Review, 52(4–6): 608–630.

Jamali, H. and Mehrabi, B., 2014. Relationships between arc maturity and Cu-Mo-Au porphyry and related epithermal mineralization at the Cenozoic Arasbaran Magmatic Belt. Ore Geology Reviews, 65(2): 487–501.

John, D., Ayuso, R., Barton, M., Blakely, R., Bodnar, R., Dilles, J., Gray, F., Graybeal, F., Mars, J. and McPhee, D., 2010. Porphyry copper deposit model, chap. B of Mineral deposit models for resource assessment, US Geological Survey Scientific Investigations Report, 169 pp.

Kouzmanov and K., Pokrovski, G.S., 2012. Hydrothermal controls on metal distribution in porphyry Cu (-Mo-Au) system, In: J.W. Hedenquist, M. Harris and F. Camus (Editors), Geology and Genesis of Major Copper Deposits and Districts of the World. The Society of Economic Geologists, Geneva, Switzerland, pp. 573–618.

Li, G., Peacor, D.R. and Essene, E.J., 1998. The formation of sulfides during alteration of biotite to chlorite-corrensite. Clays and Clay Minerals, 46(6): 649–657

Maanijou, M. and Mostaghimi, M., 2013. The mass balance calculation of hydrothermal alteration in Sarcheshmeh porphyry copper deposit. Journal of Economic Geology, 5(2): 175–199.

Maanijou, M., Mostaghimi, M., Riseh, M.A. and Gerow, A.A.S., 2012. Systematic sulfur stable isotope and fluid inclusion studies on veinlet groups in the Sarcheshmeh porphyry copper deposit, based on new data. Journal of Economic Geology, 4(2): 217–239. (in Persian)

Mehrpartou, M., 1993. Contributions to the geology, geochemistry, ore genesis and fluid inclusion investigations on Sungun Cu-Mo porphyry deposit (North-West of Iran). Unpublished Ph.D. thesis, Hamburg University, Hamburg, Germany, 245 pp.

NICICO )National Iranian Copper Industries Company), 2006. Geological report and map on Kighal area in Scale 1: 5000. NICICO, Tehran, Report RC-02/5363301-P/OC/1385/00/0-1221, 350 pp.

Penniston-Dorland, S.C., 2001. Illumination of vein quartz textures in a porphyry copper ore deposit using scanned cathodoluminescence: Grasberg Igneous Complex, Irian Jaya, Indonesia. American Mineralogist, 86(5–6): 652–666.

Petruk, W., 2000. Applied mineralogy in the mining industry. Elsevier, Ontario, 268 pp.

Putnis, A., 2002. Mineral replacement reactions: from macroscopic observations to microscopic mechanisms. Mineralogical Magazine, 66(5): 689–708.

Richards, J.P., 2015, Tectonic, magmatic, and metallogenic evolution of the Tethyan orogen: From subduction to collision. Ore Geology Reviews, 70(30): 323–345

Roedder, E. and Ribbe, P., 1984. Fluid inclusions. Mineralogical Society of America, Washington, DC, 468 pp.

Rusk, B.G., Reed, M.H. and Dilles, J.H., 2008. Fluid inclusion evidence for magmatic-hydrothermal fluid evolution in the porphyry copper-molybdenum deposit at Butte, Montana. Economic Geology, 103(2): 307–334.

Sillitoe, R.H., 1972. A plate tectonic model for the origin of porphyry copper deposits. Economic geology, 67(2): 184–197.

Sillitoe, RH. 2000. Gold-rich porphyry deposits: descriptive and genetic models and their role in exploration and discovery. In: S.G. Hagemann and P.E. Brown (Editors), Reviews in Economic Geology. The Society of Economic Geologists, London, pp. 315–345.

Sillitoe, R.H., 2010. Porphyry copper systems. Economic Geology, 105(1): 3–41.

Simmonds, V., 2013. Geochemistry and petrogenesis of an adakitic quartz-monzonitic porphyry stock and related cross-cutting dike suites, Kighal, northwest Iran. International Geology Review, 55(9): 1126–1144.

Simmonds, V., Calagari, A.A. and Kyser, K., 2013. Fluid inclusion and stable isotope studies of the Kighal porphyry Cu–Mo prospect, East-Azarbaidjan, NW Iran. Arabian Journal of Geosciences, Fluid inclusion and stable isotope studies of the Kighal porphyry Cu–Mo prospect, East-Azarbaidjan, NW Iran. Arabian Journal of Geosciences, 8(1): 1–17.

Shafiei, B., 2010. Lead isotope signatures of the igneous rocks and porphyry copper deposits from the Kerman Cenozoic magmatic arc (SE Iran), and their magmatic-metallogenetic implications. Ore Geology Reviews, 38(1): 27–36.

Shafiei, B., Haschke, M. and Shahabpour, J., 2009. Recycling of orogenic arc crust triggers porphyry Cu mineralization in Kerman Cenozoic arc rocks, southeastern Iran. Mineralium Deposita, 44(6): 265–283.

Taghizadeh-Farahmand, F., Sodoudi, F., Afsari, N. and Ghassemi, M.R., 2010. Lithospheric structure of NW Iran from P and S receiver functions. Journal of Seismology, 14(4): 823–836.

Whitney, D.L. and Evans, B.W., 2010. Abbreviations for names of rock-forming minerals. American mineralogist, 95(1): 185–187.

Wilkinson, J., 2001. Fluid inclusions in hydrothermal ore deposits. Lithos, 55(1): 229–272.

Williams, S.A. and Cesbron, F.P., 1977. Rutile and apatite: useful prospecting guides for porphyry copper deposits. Mineralogical Magazine, 41(318): 288–292.

Zhang, H.D., Zhang, H.F., Santosh, M. and Li, S.R., 2014. Fluid inclusions from the Jinchang Cu–Au deposit, Heilongjiang Province, NE China: Genetic style and magmatic-hydrothermal evolution. Journal of Asian Earth Sciences, 82(12): 103–114.

Ziaii, M., Ardejani, F.D., Ziaei and M., Soleymani, A.A., 2012. Neuro-fuzzy modeling based genetic algorithms for identification of geochemical anomalies in mining geochemistry. Applied Geochemistry, 27(3): 663–676.

Ziaii, M., Carranza, E.J.M. and Ziaei, M., 2011. Application of geochemical zonality coefficients in mineral prospectivity mapping. Computers and Geosciences, 37(12): 1935–1945.