Ore facies, mineralogy, alteration, geochemistry and genesis of the Vanakan (Sokan) barite-zinc-lead-copper deposit, north east of Semnan

Document Type : Research Article

Authors

• Farzaneh Pezeshki Gharache
• Fardin Mousivand
• Mehdi Rezaei-Kahkhaei
• Farajollah Fardoost

Department Petrology and Economic Geology, Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran

10.22067/econg.v13i1.82657

Abstract

Introduction
The Vanakan (Sokan) barite-zinc-lead-copper deposit is located at 23 km northeast of Semnan, in the North Central Iran magmatic belt. It has occurred within the Eocene volcanic-sedimentary sequence. The host rocks of the ores mainly consist of tuff, shale and shaly tuff. Volcanic rocks in the district at the Ahovan region involve both mafic and felsic compositions including basalt, andesite, dacite, rhyolite and tuff. Many studies have been conducted on ore deposits in the Semnan region including Poshteh barite- base metals volcanogenic massive sulfide (VMS) deposit (Ghaffari, 2017), Hamyard (Haji-Bahrami, 2012) and northeast Semnan (e.g., Ghiasvand et al., 2009; Shahri, 2011) iron skarn deposits. Therefore, studying the barite-metal deposits in the Central Iran magmatic belt such as the Vanakan deposit, can provide exploratory keys to discover new reserves, which is one of the main goals of this research study. In this work, study on ore facies,mineralogy, alteration, geochemistry and genesis of the Vanakan barite-zinc-lead-copper deposit are considered.
 
Materials and methods
First, regional and local geology, alteration, ore textures and structures and mineralogy of ore horizons in the Vanakan ore deposit were carefully checked out and studied during field studies. Then, the samples were systematically collected from trenches and open pit of the mine. Mineralogical studies were conducted on 24 thin sections and 8 polished samples in the microscopic laboratory at the Shahrood University of Technology. For geochemical studies, about 16 systematic samples from different ore facies and ore horizons were collected. Then, the samples were analyzed by inductively coupled plasma-atomic emission spectroscopy (ICP-AES) method, and a few samples were studied by X-ray diffraction (XRD) method in the Aria Sharif Laboratories Company.
 
Results
The host sequence in the Vanakan deposit involves three units, from bottom to top: Unit1: conglomerate, limestone, sandstone; Unit2: andesitic to dacitic lava-rich, and unit3: acidic tuff-rich. Mineralization as the Vanakan 1 and 2 deposits occurred at top of unit 2 and within unit 3. The entire Vanakan area involves a local syncline with northeast-southwest axial trend, in which the Vanakan 1 and Vanakan 1 deposits are located in the northern and southern limbs of the syncline, respectively. Based on structural,  textural and mineralogical studies, five different ore facies were distinguished  in Vanakan 1, from bottom to: 1) vein-veinlet and breccia: involving barite-pyrite-quartz vein-veinlets, 2) massive sulfide: composed of massive sphalerite, galena, barite, chalcopyrite and pyrite, 3) layered-banded sulfide ore: involving alternations of ore and sericite altered tuff-rich bands, 4) baritic ore: comprising of mainly barite and little sulfides, and 5) banded-exhalative cherty sediments. The ore facies in the Vanakan 2 from bottom to top are 1) barite -(galena)-rich vein-veinlets and 2) banded cherty iron oxide-hydroxides -rich red exhalative sediment. From a mineralogical point of view, the ores in the Vanakn 1 mainly consist of barite, sphalerite, galena, pyrite, chalcopyrite and marcasite accompanied with secondary minerals such as malachite, chrysocolla, smithsonite, cerussite, hematite, limonite, goethite.
 
Discussion
Based on different characteristics of mineralization in the Vanakan district, such as geometry of ore bodies, textures and structures, ore facies, wall rock alterations, mineralogy, metal zonation and geochemical features, the Vanakan deposit can be classified as a bimodal- felsic or Kuroko-type volcanogenic massive sulfide (VMS) deposit, similar to those of the Mount Read volcanic deposits of Tasmanian Australia such as Rosebery (Large, 1992; Large et al., 2001) and Hokuroko basin in Japan (Huston et al., 2011; Ohmoto and Skinner, 1983).
 
References
Ghaffari, G., 2017. Mineralogy, geochemistry and genesis of the Poshteh barite-kaoline-copper deposit, east of Semnan. M.Sc. thesis, Shahrood University of Technology, Shahrood, Iran, 186 pp. (in Persian with English abstract)
Ghiasvand, A., Ghaderi, M. and Rashidnejad, N., 2009. Mineralogy, geochemistry and origin of iron deposits in north of Semnan. Geosciences, 18(72): 33–44. https://doi.org/10.22071/GSJ.2010.57133
Haji-Bahrami, M., 2012. Petrography, geochemistry and genesis of the Hamyard iron deposit, northeast of Semnan. M.Sc. Thesis, Damghan University, Damghan, Iran, 175 pp. (in Persian with English abstract).
Huston, D.L., Relvas, J.M.R.S., Gemmell, J.B. and Drieberg, S., 2011. The role of granites in volcanic-hosted massive sulphide ore-forming systems: an assessment of magmatic–hydrothermal contributions. Mineralium Deposita, 46(5–6), 473–507. https://doi.org/10.1007/s00126-010-0322-7
Large, R.R., 1992. Australian volcanic-hosted massive sulfide deposits; features, styles, and genetic models. Economic Geology, 87(3): 471–510. https://doi.org/10.2113/gsecongeo.87.3.471
Large, R.R., McPhie, J., Gemmell, J.B., Herrmann, W. and Davidson, G.J., 2001. The spectrum of ore deposit types, volcanic environments, alteration halos, and related exploration vectors in submarine volcanic successions: Some examples from Australia. Economic Geology, 96(5): 913–938. https://doi.org/10.2113/gsecongeo.96.5.913
Ohmoto, H. and Skinner, B.L., 1983. The Kuroko and related volcanogenic massive sulphide deposits: Introduction and summary of new findings. In: H. Ohmoto and B.J. Skinner (Editors), Kuroko and related volcanogenic massive sulphide deposits. Economic Geology, Canada, pp. 1-8. https://doi.org/10.5382/Mono.05.01
Shahri, M., 2011. Investigation of skarnization, metasomatism and related to mineralization in Zartul area (Northeast Semnan). M.Sc. thesis, University of Technology, Shahrood, Iran, 144 pp. (in Persian with English abstract)

Keywords

• Barite- Zinc- lead- copper
• volcanogenic massive sulfide
• Kuroko
• Vanakan
• Sokan
• ore facies
• Semnan

20.1001.1.20087306.1400.13.1.2.6

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References

Aghanabati, S.A., 2004. Geology of Iran. Geological Survey of Iran, Tehran, 400 pp. (in Persian)

Alavi, M., 1991. Sedimentary and structural characteristics of the Paleo-Tethys remnants in northeastern Iran. Geological Society of America Bulletin, 103(8): 983–992. https://doi.org/10.1130/0016-7606(1991)103<0983:SASCOT>2.3.CO;2  

Alavi-Naini, M., 1997. Geological map of Jam, scale 1:100000. Geological Survey of Iran.

Barnes, H.L., 1997. Geochemistry of hydrothermal ore deposits. John Wiley & Sons, NewYork: 797 pp.

Barrie, C.T. and Hannington, M.D., 1999. Introduction: classification of VMS deposits based on host rock composition. In: C.T. Barrie and M.D. Hannington (Editors), Volcanic-associated massive sulfide deposits: processes and examples in modern and ancient settings. Society of Economic Geologists, Littleton, pp. 2–10. https://doi.org/10.5382/Rev.08.01

Barrie, C.T., Ludden, J.N. and Green, T.H., 1993. Geochemistry of volcanic rocks associated with Cu-Zn and Ni-Cu deposits in the Abitibi subprovince. Economic Geology, 88(6): 1341–1358. https://doi.org/10.2113/gsecongeo.88.6.1341

Barton Jr, P.B., 1978. Some ore textures involving sphalerite from the Furutobe mine, Akita Prefecture, Japan. Mining Geology, 28(150): 293–300. https://doi.org/10.11456/shigenchishitsu1951.28.293

Franklin, J.M., Gibson, H.L., Galley, A.G. and Jonasson, I.R., 2005. Volcanogenic massive sulfide deposits. In: J.W., Hedenquist, J.F.H., Thompson, R.J., Goldfarb and J.P., Richards (Editors), Economic Geology 100th Anniversary Volume, Society of Economic Geologists, Littleton, pp. 523–560. https://doi.org/10.5382/AV100.17

Galley, A.G., Bailes, A.H. and Kitzler, G., 1993. Geological setting and hydrothermal evolution of the Chisel Lake and North Chisel Zn-Pb-Cu-Ag-Au massive sulfide deposits, Snow Lake, Manitoba. Exploration and Mining Geology, 2(4): 271–295.  Retrieved June 13, 2021 from https://pubs.geoscienceworld.org/cim/emg/article/2/4/271/61028/Geological-setting-and-hydrothermal-evolution-of

Ghaffari, G., 2017. Mineralogy, geochemistry and genesis of the Poshteh barite-kaoline-copper deposit, east of Semnan. M.Sc. thesis, Shahrood University of Technology, Shahrood, Iran, 186 pp. (in Persian with English abstract)

Ghasemi, H. and Rezaei-Kahkhaei, M., 2015. Petrochemistry and tectonic setting of the Davarzan-Abbasabad Eocene Volcanic (DAEV) rocks, NE Iran. Mineralogy and Petrology, 109(2): 235–252. https://doi.org/10.1007/s00710-014-0353-3

Ghiasvand, A., Ghaderi, M. and Rashidnejad, N., 2009. Mineralogy, geochemistry and origin of iron deposits in north of Semnan. Geosciences, 18(72): 33–44. https://doi.org/10.22071/GSJ.2010.57133

Gibson, H.L., Allen, R.L., Riverin, G. and Lane, T.E., 2007. The VMS model: Advances and application to exploration targeting. In B. Milkereit (Editor), Proceedings of Exploration 07: Fifth Decennial International Conference on Mineral Exploration. University Avenue Toronto, Ontario, pp. 713–730. Retrieved June 13, 2021 from http://www.dmec.ca/ex07-dvd/E07/pdfs/49.pdf

Glasby, G.P., Iizasa, K., Hannington, M., Kubota, H. and Notsu, K., 2008. Mineralogy and composition of Kuroko deposits from northeastern Honshu and their possible modern analogues from the Izu-Ogasawara (Bonin) Arc south of Japan: Implications for mode of formation. Ore Geology Reviews, 34(4): 547–560. https://doi.org/10.1016/j.oregeorev.2008.09.005

Goodfellow, W.D., 2004. Geology, genesis and exploration of SEDEX deposits, with emphasis on the Selwyn basin, Canada. In: M. Deb and W.D. Goodfellow (Editors), Sediment-hosted lead-zinc sulfide deposits: Attributes and models of some major deposits of India, Australia and Canada. Narosa publishing house, Delhi, India, pp. 24-99. https://doi.org/10.2113/gsecongeo.100.3.597

Grenne, T. and Slack, J.F., 2005. Geochemistry of jasper beds from the Ordovician Løkken ophiolite, Norway: origin of proximal and distal siliceous exhalites. Economic Geology, 100(8): 1511–1527. https://doi.org/10.2113/gsecongeo.100.8.1511

Haji-Bahrami, M., 2012. Petrography, geochemistry and genesis of the Hamyard iron deposit, northeast of Semnan. M.Sc. Thesis, Damghan University, Damghan, Iran, 175 pp. (in Persian with English abstract).

Halbach, P.E., Fouquet, Y. and Herzig, P., 2003. Mineralization and compositional patterns in deep-sea hydrothermal systems. In: P.E., Halbach, V., Tunnicliffe, J.R., Hein (Editors), Energy and Mass Transfer in Marine Hydrothermal Systems. Dahlem University Press, Berlin, pp. 85–122. Retrieved June 13, 2021 from https://d-nb.info/966617797/04

Hannington, M.D., de Ronde, C.E.J. and Peterson, S., 2005. Sea-floor tectonics and submarine hydrothermal systems. In: J.W., Hedenquist, J.F.H., Thompson, R.J., Goldfarb and J.P., Richards (Editors), Economic Geology 100th Anniversary Volume, Society of Economic Geologists, Littleton, CO, pp. 111–141. https://doi.org/10.5382/AV100.06

Hashemi, F., Mousivand, F. and Rezaei-Kahkhaei, M., 2015. Ore horizons, ore facies, mineralogy and geochemistry of volconogenic massive sulfide (VMS) deposits of the Varandan Ba-Pb-Cu deposit, southwest of Qamsar Iran. Journal of Economic Geology, 9(2): 587-616. (in Persian with English abstract). https://doi.org/10.22067/econg.v9i2.45447

Herrington, R., Maslennikov, V., Zaykov, V., Seravkin, I., Kosarev, A., Buschmann, B., Orgeval, J.J., Holland, N., Tesalina, S. and Nimis, P., 2005. Classification of VMS deposits: lessons from the South Uralides. Ore Geology Reviews, 27(1-4): 203–237. http://doi.org/10.1016/j.oregeorev.2005.07.014

Hollis, S.P., Yeats, C.J., Wyche, S., Barnes, S.J., Ivanic, T.J., Belford, S.M., Davidson, G.J., Roache, A.J. and Wingate, M.T.D., 2015. A review of volcanic-hosted massive sulfide (VHMS) mineralization in the Archaean Yilgarn Craton, Western Australia: Tectonic, stratigraphic and geochemical associations. Precambrian Research, 260: 113–135. https://doi.org/10.1016/j.precamres.2014.11.002

Huston, D.L., Relvas, J.M.R.S., Gemmell, J.B. and Drieberg, S., 2011. The role of granites in volcanic-hosted massive sulphide ore-forming systems: an assessment of magmatic–hydrothermal contributions. Mineralium Deposita, 46(5–6), 473–507. https://doi.org/10.1007/s00126-010-0322-7

Khanehdar-Kolver, M., 2017. Mineral chemistry of intrusive rocks and application of remote sensing for identification of the Gardaneh Ahovan rocks, NE Semnan. M.Sc. Thesis, Shahrood University of Technology, Shahrood, Iran, 195 pp. (in Persian with English abstract).

Large, R.R., 1992. Australian volcanic-hosted massive sulfide deposits; features, styles, and genetic models. Economic Geology, 87(3): 471–510. https://doi.org/10.2113/gsecongeo.87.3.471

Large, R.R., McPhie, J., Gemmell, J.B., Herrmann, W. and Davidson, G.J., 2001. The spectrum of ore deposit types, volcanic environments, alteration halos, and related exploration vectors in submarine volcanic successions: Some examples from Australia. Economic Geology, 96(5): 913–938. https://doi.org/10.2113/gsecongeo.96.5.913

Lobanov, K. and Gaskov, I., 2012. The Karchiga copper massive sulfide deposit in the high grade metamorphosed rocks of the Kurchum block: geologic structure, formation, and metamorphism (Rudny Altai). Russian Geology and Geophysics, 53(1):77-91. https://doi.org/10.1016/j.rgg.2011.12.006

Montelius, C., 2005. The genetic relationship between rhyolitic volcanism and Zn-Cu-Au deposits in the Maurliden Volcanic Centre, Skellefte District, Sweden: volcanic facies, lithogeochemistry and geochronology. Ph.D. thesis, Lulea University of Technology, Lulea, Sweden. 135 pp.

Mousivand, F., Rastad, E., Hoshino, K. and Watanabe, M., 2007. The Bavanat Cu-Zn-Ag orebody: first recognition of a Besshi-type VMS deposit in Iran. Neues Jahrbuch Für Mineralogie-Abhandlungen: Journal of Mineralogy and Geochemistry, 183(3): 297–315. https://doi.org/10.1127/0077-7757/2007/0075

Ohmoto, H., 1996. Formation of volcanogenic massive sulfide deposits: the Kuroko perspective. Ore Geology Reviews, 10(3–6): 135–177. https://doi.org/10.1016/0169-1368(95)00021-6

Ohmoto, H. and Skinner, B.L., 1983. The Kuroko and related volcanogenic massive sulphide deposits: Introduction and summary of new findings. In: H. Ohmoto and B.J. Skinner (Editors), Kuroko and related volcanogenic massive sulphide deposits. Economic Geology, Canada, pp. 1-8. https://doi.org/10.5382/Mono.05.01

Pezeshki, F., 2019. Mineralogy, geochemistry and genesis of the Vanakan Barite-Kaoline deposit, east of Semnan. M.Sc. thesis, Shahrood University of Technology, Shahrood, Iran, 200 pp. (in Persian with English abstract)

Revan, M.K., Genç, Y., Maslennikov, V.V., Maslennikov, S.P., Large, R.R. and Danyushevsky, L.V., 2014. Mineralogy and trace element geochemistry of sulfide minerals in hydrothermal chimneys from the Upper-Cretaceous VMS deposits of the eastern Pontide orogenic belt (NE Turkey). Ore Geology Reviews 63: 129–149. https://doi.org/10.1016/j.oregeorev.2014.05.006

Robert, R., Seal, I.I. and Jane, M., 2008. Environmental geochemistry of a Kuroko-type massive sulfide deposit at the abandoned Valzinco mine, Virginia, USA. Applied Geochemistry, 23(2): 320–342. https://doi.org/10.1016/j.apgeochem.2007.10.001

Samadi, M. and Moin-vaziri, H., 1998. Petography, petrogenesis and geochemistry of igneous rocks at north to northeast of Semnan. M.Sc. Thesis, Tarbiat Moaalem University, Tehran. Iran, 128 pp.

Schlatter, D., 2005. Volcanic stratigraphy, chemical stratigraphy, and hydrothermal alteration of the Petiknäs South Volcanic-hosted massive sulfide deposit, Sweden. Licentiate thesis (including maps), Lulea University of Technology, Lulea, Sweden. 128 pp.

Seravkin, I.B., 2013. Correlation between compositions of ore and host rocks in volcanogenic massive sulfide deposits of the Southern Urals. Geology of Ore Deposits, 55(3): 207–224. https://doi.org/10.1134/S1075701513030057

Shahri, M., 2011. Investigation of skarnization, metasomatism and related to mineralization in Zartul area (Northeast Semnan). M.Sc. thesis, University of Technology, Shahrood, Iran, 144 pp. (in Persian with English abstract)

Shikazono, N., Ogawa, Y. and Utada, M., 2008. Geochemical behavior of rare earth elements in hydrothermally altered rocks of the Kuroko mining area, Japan. Journal of Geochemical Exploration, 98(3): 65–79. https://doi.org/10.1016/j.gexplo.2007.12.003

Singer, D.A., 1986. Descriptive model of kuroko massive sulfide. In: D.P. Cox and D.A. Singer (Editors), Mineral deposit models. The United States Geological Survey Bulletin, America, pp. 189–190. Retrieved June 13, 2021 from https://pubs.usgs.gov/bul/b1693/html/bull0bfp.htm

Tajeddin, H., Rastad, E., Yaqoubpour, A. and Mohajel, M., 2010. Stages of formation and development of sulfide deposit rich in Barika gold, eastern Sardasht, northwest of Sanandaj-Sirjan metamorphic zone: Based on fabrication, structures and texture of fluid inclusion. Journal of Economic Geology, 1(2): 97–121. (in Persian with English abstract) https://doi.org/10.22067/ECONG.V2I1.3688

Taylor, C.D., Zierenberg, R.A., Goldforb, R.J., Kilburn, J.E., Seal, R.R. and Kleinkopf, M.D., 1995. Volcanic-associated massive sulfide deposits. United States Geological Survey, America, Open-File Report 95–831, 8 pp. Retrieved June 13, 2021 from https://pubs.usgs.gov/of/1995/ofr-95-0831/CHAP16.pdf

Van Staal, C.R. and Goodfellow, W.D., 2007. Pre-Carboniferous tectonic evolution and metallogeny of the Canadian Appalachians. Mineral deposits of Canada: A synthesis of major deposit-types, District Metallogeny, the Evolution of geological provinces, and exploration methods. Geological Association of Canada, Mineral Deposits Division, 5: 793–818. Retrieved June 13, 2021 from https://www.researchgate.net/publication/285023302

Whitney, D.L. and Evans, B.W., 2010. Abbreviations for names of rock-forming minerals. American Mineralogist, 95(1): 185–187. https://doi.org/10.2138/am.2010.3371

Yeats. C.J., Hollis. S.P., Halfpenny. A., Corona. J., Laflamme. C., Southam. G., Fiorentini. M., Herrington. R.J. and Spratt. J., 2017. Actively forming Kuroko-type volcanic-hosted massive sulfide (VHMS) mineralization at Iheya North, Okinawa Trough, Japan. Ore Geology Reviews 84: 20–41. https://doi.org/10.1016/j.oregeorev.2016.12.014