Aftabrou polymetallic prospect is located at the contact of Oligo-Miocene
calcalkaline granodioritic to dioritic and Eocene andesitic to basaltic volcanic
complex in middle section of Urumiyeh-Dokhtar volcanic arc in NW of Saveh
city. Petrographic study indicated that the volcanic rocks are mostly: lava and
tuff. Composition of lavas is mainly andesite and tuffs are mainly composed
of dacite to rhyodacite. Major phenocrysts in these rocks are plagioclase, clinopyroxene,
hornblende and opac minerals. Petrographic and geochemical
studies indicated an I-type granitoid and, calcalkaline magmatism associated
with continental margin of subduction zone. This study determined three
mineralization subzones of 0.2% - 5.3% Cu, 0.02 - 1.31 ppm Au and 1.2% -
3.9% Zn. Fluid inclusion studies on quartzic veins associated with magmatism,
demonstrated that homogenization temperatures of this mineralization
fluid are between 170°C to 330°C, the salinity of the system is between 11.7 to
23.5 weight percent, density of this fluid is 0.8 - 1.1 g/cm3 and is occurred in
depth of less than 1800 m of surface. Fluid inclusion studies suggested that
formation of mineral deposit is simple cooling and mixing with atmospheric
water and type of Aftabrou deposit is IOCG. In this base, it is assumed that
this IOCG mineralization is occurred associate with magmatism that is
formed as a result of Neo-Tethys oceanic subduction beneath the Central Iran
zone which is replaced in the Orumieh-Dokhtar magmatic arc.
References
[1]
Afshooni, S.Z., Mirnejad, H., Esmaeily, D. and Asadi, H.H. (2013) Mineral Chemistry of Hydrothermal Biotite from the Kahang Porphyry Copper Deposit (NE Isfahan). Central Province of Iran. Ore Geology Reviews, 54, 214-233.
[2]
Ayati, F., Yavuz, F., Asadi, H.H., Richards, J.P. and Jourdan, F. (2013) Petrology and Geochemistry of Calc-Alkaline Volcanic and Subvolcanic Rocks, Dalli Porphyry Copper-Gold Deposit, Markazi Province, Iran. International Geology Review, 55, 158-184. https://doi.org/10.1080/00206814.2012.689640
[3]
Azadi, M., Mirmohammadi, M. and Hezarkhani, A. (2014) Aspects of Magmatic-Hydrothermal Evolution of Kahang Porphyry Copper Deposit, Central Iran. Arabian Journal of Geosciences, 8, 4873-4893. https://doi.org/10.1007/s12517-014-1528-2
[4]
Asadi, H.H., Porwal, A., Fatehi, M., Kianpourian, S. and Lu, Y.J. (2015) Exploration Feature Selection Applied to Hybrid Data Integration Modeling: Targeting Copper-Gold Potential in Central Iran. Ore Geology Reviews, 71, 819-838.
[5]
Amini-Haroni, I. (2014) Mineralogy and Geochemistry of the Aftabru Poly Metal Prospect, Markazi Province. MSc Thesis, Geology Department, Isfahan University, Isfahan, 127 p. (In Persian)
[6]
Asadi, H.H., Kianpouryan, S., Lu, Y.J. and McCuaig, T.C. (2014) Exploratory Data Analysis and C-A Fractal Model Applied in Mapping Multi-Element Soil Anomalies for Drilling: A Case Study from Sari Gunay Epithermal Gold Deposit, NW Iran. Journal of Geochemical Exploration, 145, 233-241.
[7]
Sabzian, A., Masoudi, F., Emami, M.H. and Nezafati, N. (2015) The Study of Dual Entity of Alkaline-Calcalkaline Magma Origin in Plutonic Rocks in Aftabrou Area, North West of Saveh, Arak. Journal of Biodiversity and Environmental Science, 6, 428-437.
[8]
Emami, M.H. (2000) Magmatism in Iran. Published by the Geological Survey and Mineral Exploration Iran.
[9]
Soltani, V. and Asadi, H.H. (2013) Preliminary Exploration Report of Aftabru IOCG Prospect. Open File Report, Dorsa Pardazeh Company, Markazi Province, 73.
[10]
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, 651-670. https://doi.org/10.2113/gsecongeo.93.5.651
[11]
Sabzian, A., Masoudi, F., Asadi Harooni, H., Emami, M.H. and Nezafati, N. (2015) Application of Feldespar and Hornblende Composition to Investigate the Nature and Thermobarometry Aftabrou Pluton, Northwest Uroumieh-Dokhtar Magmatic Belt, Iran. Journal of Biodiversity and Environmental Science, 6, 609-662.
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.
[14]
Sterner, S.M., Hall, D.L. and Bodnar, R.J. (1988) Synthetic Fluid Inclusions. V. Solubility Relations in the System NaCl-KCl-H2O under Vapor-Saturated Conditions. Geochimica et Cosmochimica Acta, 52, 989-1005.
[15]
Shepherd, T., Rankin, A.H. and ALderton, D.H.M. (1985) A Practical Guide to Fluid Inclusion Studies. Blackie, Glasgow; Chapman and Hall, New York, 239.
[16]
Barnes, H.L. (1979) Solubility of Ore Minerals. In: Barnes, H.L., Ed., Geochemistry of Hydrothermal Ore Deposits, Wiley, Hoboken, 404-460.
[17]
Roedder, E. (1984) Fluid Inclusion. In: Ribbe, P.H., Ed., Review in Mineralogy, Vol. 12, Mineralogical Society of America, Washington DC.
[18]
Davidson, E., Neepstand, D.C., Yoko Ishid, F. and Brando, P. (2008) Effects of an Experimental Drought and Recovery on Soil Emissions of Carbon Dioxide, Methane, Nitrous Oxide.
[19]
Baker, D.R. (1998) Granitic Melt Viscosity and Dike Formation. Journal of Structural Geology, 20, 1395-1404.
[20]
Barton, M.D. and Johnson, D.A. (1996) Evaporitic Source Model for Igneous-Related Fe Oxide-(REE-Cu-Au-U) Mineralization. Geology, 24, 259-262. https://doi.org/10.1130/0091-7613(1996)024<0259:ESMFIR>2.3.CO;2
[21]
Williams, P., Barton, D., Johnson, A., Fontbote, L., De Haller, A., Mark, G.H.S., Oliver, N. and Marschik, R. (2005) Iron Oxide Copper-Gold Deposits: Geology, Space-Time Distribution, and Possible Modes of Origin. Society of Economic Geologists, Inc., 371-405.
[22]
Marschik, R. (2011) Chilean IOCG Deposits the Candelaria-Punta del Cobre and Mantoverde Systems. Let’s Talk Ore Deposits 11th SGA Biennial Meeting Antofagasta, Chile, September 2011.
[23]
Sillitoe, R.H. and Burrows, D.R. (2002) New Field Evidence Bearing on the Origin of the El Laco Magnetite Deposit, Northern Chile. Economic Geology, 97, 1101-1109.
[24]
Corriveau, L. (2007) Fe Oxide Copper-Gold Deposits: A Canadian Perspective. In: Goodfellow, W.D., Ed., Mineral Deposits of Canada: A Synthesis of Major Deposit-Types, District Metallogeny, the Evolution of Geological Provinces, and Exploration Methods, Special Publication 5, Mineral Deposits Division, Geological Association of Canada.
[25]
Kreiner, D.C. and Barton, M.D. (2011) High-Level Alteration in Iron-Oxide(-Cu-Au) (IOCG) Vein Systems, Examples near Copiapó, Chile. 11th SGA Biennial Meeting Let’s Talk Ore Deposits.
[26]
Pirajno, F., Hocking, R.M., Reddy, S.M. and Jones, J.A. (2009) A Review of the Geology and Geodynamic Evolution of the Palaeoproterozoic Earaheedy Basin, Western Australia. Earth-Science Reviews, 94, 39-77.
