Investigation of structural distribution of gold mineralization in “Sefidsang” area (SE-Zahedan, Iran)
Paper Details
Investigation of structural distribution of gold mineralization in “Sefidsang” area (SE-Zahedan, Iran)
Abstract
Sefidsang area is located 70 km to south east of Zahedan. This area is located in the eastern Iran flysch zone. It has been composed of Ophiolithic rocks and Flysch sediments. Zahedan granitoides of Oligocene age have intruded in these rocks with a NW-SE trend.It within shear zone lies structurally that is among two strike-slip fault (Zahedan and Nosratabad) in east and west respectively. The Zahedan fault with > 150 km length, almost N-S trend and reverse component is strike- slip. The Nosratabad fault with < 200 km length, NW-SE trend and reverse component is strike-slip. The lithic units of this area have been influenced by NE-SW trending of joints and faults. Sampling was considering factors such as stratigraphy, lithology, tectonic and alteration zones. The 60 lithogeochemical samples after preparation were analyzed by AAS method. For 6 selective elements (Au, Ag, Cu, Pb, Zn and As) factors such as frequency distribution, background, threshold, anomaly, enrichment index and mineralization index have been calculated individually and with the separation of lithic units, and the element distribution maps and joints map have been drawn. Therefore spatial location, structural and geochemical distribution and mineralization relationship with structural factors have been determined. The most enrichment index of Au with average 1.70 ppm in siliceous veins have been achieved that these veins emplaced within shear joints that its affected by movements of two Zahedan and Nosratabad main stike slip faults. The same strike of siliceous veins and the main strike of joints and faults in this area show that mineralization is in the control of structural parameters.
Bagherifar A. 2008. Gold lithogeochemical exploration in Dargiaban area, SE-Zahedan, The Dissertation of M.Sc. in Economic geology, usb.ac.ir.
Barbares AH. 2007. Geology, gold deposits, and mining history of the southern Mother lode: [Online], National association of geology teachers – Far west section, fall meeting guidebook.
Berberian MJA, Jackson M, Qorashi M, Talebian M, Khatib M, Priestly K. 2000. The 1994 Sefidabeh earthquakes in eastern Iran: blind thrusting and active tectonics of the Sistan suture zone, geo – phys. J. Int 142, 283 – 299.
Fran P, Bierlin David I, Groves Richard J, Goldfarb Benoit Dube. 2006. Lithospheric controls on the formation of provinces hosting giant orogenic gold deposits. Letter, Springer 875-883.
Frank P, Bierlein Finbarr C, Murphy Roberto F, Weinberg Terry Lees. 2006. Distribution of orogenic gold deposits in relation to fault zones and gravity gradients: targeting tools applied to the eastern goldfiels, Yilgarn craton, Western Australia.Article, Springer 109-124.
Tirul RIR, Bell RJ, Griffis VE, Camp. 1983. The Sistan suture zone of eastern Iran, Geol. Soc. Am. Bull 94, 134-150.
Wellmer FW. 1998. Statistical evaluations in exploration for mineral deposits. Article, Springer New York.
Abdolrahim Bagherifar, Behnam Rahimi, Mohammad Boomeri, 2015. Investigation of structural distribution of gold mineralization in “Sefidsang” area (SE-Zahedan, Iran). J. Biodiv. Environ. Sci., 6(6), 528-533.
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