Geology, mineralogy, and fluids inclusion studies in Shadan copper- gold deposit, Southern Khorasan

Document Type : Research Paper


1 Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Department of Earth and Environmental Sciences, Ludwig-Maximilians University of Munich, Germany

3 Department of Geology, Research Institute for Earth Sciences, Geological Survey of Iran


Shadan copper-gold deposit is located in nearly 65km Southwest of Birjand. The area is a part of eastern margin tertiary volcano-plutonic belt in Lut Block. The oldest units in this area are tertiary andesite, tuff, rhyolite, and rhyolitic tuff. The units are intruded by late Eocene–Oligocene Shadan subvolcanic, granite, and granodiorite intrusion rocks. The rocks are again overlined by Quaternary deposits. Shadan mine is considered as Cu-Au porphyry in which mineralization was controlled by tectonic strictures. The deposit is hosted by dacite, rhyodacite and micro granodiorite subvolcanic rocks which are mainly associated with potassic, sericitic, argillic and propylitic alterations. Mineralization mostly occurs as disseminated, stockwork, veins and veinlets in host rocks. The paragenesis in veins and veinlets includes quartz, chalcopyrite, pyrrhotite, magnetite, hematite and covellite, gold, iron-hydroxide and rare abundances of other minerals. Gold grains are between 1-150μm in diameter commonly occurring within the quartz and in some places occur in


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Agard, P., Omrani, J., Jolivet, L., Mouthereau, F., 2005.Convergence history across Zagros (Iran): Constraints from collisional and earlier deformation. International Journal of Earth Sciences, 94: 401–419.##
Agard, P., Omrani, J., Jolivet, L., Whitechurch, H., Vrielynck, B., Spakman, W., Monie, P.,Meyer, B., Wortel, R., 2011.Geological, fluid inclusion and isotopic characteristics of the Gardaneshir … 273 Zagros orogeny: a subduction-dominated process. Geological Magazine, 148: 692–725.##
Aghanabati, A., 2004. Geological of Iran, Geological Survey of Iran, 606 pp. (in Persion). J. Iran. Pet. Soc.##
Aghazadeh, M., Hou, Z., Badrzadeh, Z. and Zhou, L., 2015. Temporal–spatial distribution and tectonic setting of mporphyry copper deposits in Iran: constraints from zircon U–Pb and molybdenite Re–Os geochronology. Ore geology reviews, 70: 385–406.##
Arjmandzadeh, R., 2011. Mineralization, geochemistry, geochronology, and determination of tectonomagmatic setting of intrusive rocks in Dehsalm and Chahshaljami prospect areas, Lut block, east of Iran. Ph.D. thesis, Ferdowsi University of Mashhad, 215 pp. (in Persian).##
Arjmandzadeh, R., Karimpour, M.H., Mazaheri, S.A., Santos, J.F., Medina, J.M., Homam, S.M., 2011. Sr-Nd isotope geochemistry and petrogenesis of the Chah-Shaljami granitoids (Lut block, eastern Iran). Journal of Asian Earth Sciences, 41: 283–296.##
Arjmandzadeh, R. and Santos, J.F., 2014. Sr–Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu–Mo porphyry mineralizing intrusives from Lut Block, eastern Iran. International Journal of Earth Sciences, 103(1),pp.123–140.##
Bagheri, S., Stampfli, G.M., 2008. The Anarak, Jandaq and Posht-e-Badam metamorphic complexes in central Iran: New geological data, relationships and tectonic implications. Tectonophysics451:123–155. doi:10.1016/j.tecto.2007.11.047##
Bakker, R.J., 2008. AqSoVir software package fluids, v.2. Fluid inclusion laboratory Leoben, for fluid system: H2ONaCl- KCl-CaCl2 (partly).
Bakker, R.J., 2008. Loner Ap software package fluids, v.2. Fluid inclusion laboratory Leoben, for fluid system: H2OCO2-CH4-NaCl-KCl.
Beane, R.E., 1983. The magmatic-meteoric transition. Geothermal Resources Council, 13: 245–253.##
Becker, S.P., Fall, A., Bodnar, R.J., 2011. Synthetic fluid inclusions. XVII. PVTX properties of high salinity H2O–NaCl solutions (>30 wt% NaCl): application to fluid inclusions that homogenize by halite disappearance from porphyry copper and other hydrothermal ore deposits. Economic Geology, 103: 539–554.##
Berberian, M., 1981. Active faulting and tectonics of Iran. In: Gupta, H.K., Delany, F.M (Eds.), Zagros Hindu Kush Himalaya Geodynamic Evolution, vol. 3. American Geophysical Union, pp. 33–69.##
Berberian, M., 1983. Structural Evolution of the Iranian Plateau; Contribution to the Seismotectonics of Iran, Part IV: Continental Deformation in the Iranian Plateau. Geological Survey of Iran, Report 52: 19–68.##
Berberian, M., King, G.C.P., 1981. Towards paleogeography and tectonic evolution of Iran. Canadian Journal of Earth Sciences, 18: 210–265.##
Bodnar, R.J., 1983. A method of calculating fluid inclusions volumes based on vapor bubble diameters and P-V-T-X properties of inclusion fluids. Economic Geology, 78: 535–542.##
Bodnar, R.J., 1993. Revised equation and table for determining the freezing point depression of H2O-NaCl solutions. Geochimica et Cosmochimica Acta, 57: 683–684.##
Bonder, R.J., Beane, R.E., 1980. Thermporal and spatial variation in hydrothermal fluid characteristic during vein filling in preore cover overlying deeply buried porphyry copper-type mineralization at Red mountain, Arizona. Economic Geology, 75: 876-893.##
Bodnar, R.J., Vityk, M.O., 1994. Interpretation of microthermometric data for H2O-NaCl fluid inclusions. Short course on fluid inclusions in minerals; Fluid inclusions in minerals, Pontignano, Italy, pp. 117–130.##
Brown, P.E., Lamb, W.M., 1989. P-V-T properties of fluids in the system H2O-CO2-NaCl: New graphical presentations and implications for fluid inclusion studies. Geochimica et Cosmochimica Acta, 53: 1209–1221.##
Camp, V., Griffis, R., 1982. Character, genesis and tectonic setting of igneous rocks in the Sistan suture zone, eastern Iran. Lithos, 15: 221–239.##
Cline, J.S., Bodnar, R.J., 1994. Direct evolution of brine from a crystallizing silicic melt at the Questa, New Mexico, nmolybdenum deposit. Economic Geology, 89: 1780–1802.##
Dercourt, J., Fourcade, E., Cecca, F., Azéma, J., Enay, R., Bassoullet, J. P., and Cottereau, N., 1994. Palaeoenvironment of the Jurassicsystem in the Western and Central Tethys (Toarcian, Callovian, Kimmeridgian, Tithonian): An overview.Geobios, 27, 625-644.##
Dercourt ,J., Gaetani M, Vrielynck B, Barrier E, Biju-Duval B, Brunet M-F, Cadet JP, Crasquin S, Sandulescu M (eds) .,2000. Atlas Peri-Tethys Paleogeographical Maps, vol I–XX. CCGM/ CGMW, Paris, pp 1–269.##
24 maps and explanatory note Dercourt, J., Zonenshain, L.P., Ricou, L.-E., Kazmin, V.G., Le Pichon, X., Knipper, A.L., Grandjacquet, C., Sbortshikov,
I.M., Geyssant, J., Lepvrier, C., Pechersky, D.H., Boulin, J., Sibuet, J.-C., Savostin, L.A., Sorokhtin, O., Westphal, M., Bazhenov, M.L., Lauer, J.P., and Biju-Duval, B., 1986, Geological evolution of the Tethys belt from the Atlantic to the Pamirs since the LIAS: Tectonophysics, 123: 241–315.##
Diamond, L.W., 2003. Glossary: Terms and Symbols used in Fluid Inclusion Studies, In: Samson, I., Anderson, A., Marshall, D (Eds.), Fluid Inclusions, Analysis and Interpretation, Short Course 32, Mineralogical Association of 274 Mahdavi et al. Geopersia, 10 (2), 2020
Canada, pp. 365–374.##
Dilles, J.H., Einaudi, M.T., 1992, Wall-rock alteration and hydrothermal flow paths about the Ann Mason porphyry copper deposit, Nevada, A 6-km vertical reconstruction. Economic Geology, 87: 1963–2001.##
Doglioni, C., Tonarini, S., Innocenti, F., 2009. Mantle wedge asymmetries and geochemical signatures along W- and ENE directed subduction zones. Lithos, 113: 179–189.##
Eftekharnejad, J., Stockline, G., 1972, Geological map of Sarchahshour, 1:100 000. Geological Survey of Iran. (in Persion).
Eftekharnejad, J., 1981. Tectonic division of Iran with respect to sedimentary basins. Journal of Iranian Petroleum Society, 82:19-28.##
Ghasemi, A., Talbot, C.J., 2006. A new tectonic scenario for the Sanandaj-Sirjan zone (Iran). Journal of Asian Earth Sciences, 26: 683–693.##
Golonka, J., 2004. Plate tectonic evolution of the southern margin of Eurasia in the Mesozoic and Cenozoic. Tectonophysics, 38: 235–273.##
Hall, D. L., Sterner, S. M., and Bodnar, R. J., 1988. Freezing point depression of NaCl-KCl-H 2 O solutions. Economic Geology, 83(1): 197–202.##
Hitzman, M.W., 2000. Iron oxide-Cu-Au deposits: what, where, when and why. Hydrothermal iron-oxide copper-gold and related deposits: a global perspective, Proceeding of AMF International Conference, Adelaide, Australia, pp. 9–25.##
Holloway JR., 1981. Composition and volumes of supercritical fluids in the Earth crust. In: Hollister LS, Crawford ML (eds) Fluid inclusions: applications to petrology. Mineralogical Association of Canada Short Course Handbook 6, pp 13–38##
Karand Saderjahan Co., 2007. Geological map of Shadan exploratory area, scale 1:5000.##
Karand Saderjahan Co., 2015, Geological map of Shadan exploratory area, scale 1:1000.##
Karand Saderjahan Co., 2015, Report on completing exploratory operations in Shadan ore, 394 pp. (in Persion).##
Lecumberri-Sanchez, P., Steele-MacInnis, M., Bodnar, R.J., 2012. A numerical model to estimate trapping conditions of fluid inclusions that homogenize by halite disappearance. Geochimica et Cosmochimica Acta, 92: 14-22.##
Malekzadeh Shafaroudi, A., 2009. Geology, mineralization, alteration, geochemistry, microthermometry, radiogenic isotopes, petrogenesis of intrusive rocks and determination of source of mineralization in Maherabad and Khopik prospect areas, South Khorasan province. Ph.D. thesis, Ferdowsi University of Mashhad, 536 pp. (in Persian).##
Mohajjel M., Fergusson CL., Sahandi MR., 2003. Cretaceous–Tertiary convergence and continental collision, Sanandaj–Sirjan Zone, western Iran. J Asian Earth Sci 21:397–412##
Nabavi, M.H., 1976. An introduction to geology of Iran. (in Persion).##
Omrani J., 2008. The geodynamic evolution of Zagros: tectonic and petrological constraints from internal zones. PhD thesis, Universite Paris, France##
Richards, J. P., and Sholeh, A., 2016. The Tethyan tectonic history and Cu-Au metallogeny of Iran. Tectonics and Metallogeny of the Tethyan Orogenic Belt. Society of Economic Geologists, Special Publication, 19: 193–212.##
Richards, J.P., Spell, T., Rameh, E., Razique, A. Fletcher, T., 2012. High Sr/Y magmas reflect arc maturity, high magmatic water content, and porphyry Cu ± Mo ± Au potential: examples from the Tethyan arcs of central and eastern Iran and western Pakistan. Economic Geology, 107(2): 295–312.##
Roedder, E., 1984. Fluid inclusions: Reviews in mineralogy, Mineralogical Society of America, 644 pp.##
Shahab pour, J., 2015. Economic Geology. (In persion).##
Shepherd, T.J., Rankin, A.H., Alderton, D.H.M, 1985. A practical guide to fluid inclusion studies, Blackie, Glasgow, 239pp.##
Sillitoe, R.H., 2010. Porphyry copper systems. Economic geology, 105(1): 3–41.##
Simmons, S.F., Simpson, M.P., Mauk, J., 2000. The mineral products of boiling in the golden cross epithermal deposit, New Zealand Minerals and Mining Conference Proceedings, 209-216.##
Stampfli GM, Borel GD .,2002. The TRANSMED transects in space and time: constraints on the paleotectonic evolution of the Mediterranean domain. In: Cavazza W, Roure F, Spakman W, Stampfli GM, Ziegler P (eds) The TRANSMED Atlas: the Mediterranean region from crust to mantle. Springer, Berlin, pp 53–80##
Stocklin, J., 1968. Structural history and tectonics of Iran: a review. American Association of Petroleum Geologists Bulletin, 52: 1229–1258.##
Stocklin, J., Nabavi, M.H., 1973. Tectonic map of Iran. Geological Survey of Iran, scale 1:2500000.##
Tarkian, M., Lotfi, M., Baumann, A., 1983. Tectonic, magmatism and the formation of mineral deposits in the centralLut, east Iran. Geological Survey of Iran, geodynamic project  (geotraverse) in Iran, 51: 357–383.##
Tirrul, R., Bell, I.R., Griffis, R.J., Camp, V.E., 1983. The Sistan suture zone of eastern Iran. Geological Society of America Bulletin, 94: 134–156.##
Touret J, Dietvorst P.,1983. Fluid inclusions in high-grade anatectic metamorphites. J Geol Soc (Lond) 140:635–649##
Ulrich, T., Günther, D., Heinrich, C.A., 2001. The evolution of a por-phyry Cu-Au deposit based on LA-ICP-MS Geological, fluid inclusion and isotopic characteristics of the Gardaneshir … 275
analyses of fluid inclusions: Bajo de la Alumbrera, Argentina. Economic Geology, 96: 1743–1774.##
Ulrich, T., Heinrich, C.A., 2001. Geology and alteration geochemistry of the porphyry Cu-Au deposit at Bajo de La Alumbrera Argentina, Economic Geology, 96: 1719–1742.##
Van den Kerkhof, A.M., Hein, U.F., 2001. Fluid inclusion petrography. Lithos, 55: 27–47.##
Wilkinson, J.J., 2001. Fluid inclusions in hydrothermal ore deposit, Lithos, 55: 229–272.##
Zhang Y, Frantz JD .,1987. Determination of the homogenization temperatures and densities of supercritical fluids in the system NaCl–KCl–CaCl2–H2O using synthetic fluid inclusions. Chem Geol 64: 335–350##