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U-Pb geochronology and Pb isotope characteristics of Chah Zard Ag-Au epithermal deposit, West-Central Iran

Citation

Ghaderi, M and Kouhestani, H and Zaw, K and Meffre, S, U-Pb geochronology and Pb isotope characteristics of Chah Zard Ag-Au epithermal deposit, West-Central Iran, Proceedings of 11th International Multidisciplinary Scientific Geoconference and EXPO - Modern Management of Mine Producing, Geology and Environmental Protection, SGEM 2011, 20-25 June, Varna, Bulgaria, pp. 1039-1046. (2011) [Refereed Conference Paper]

Copyright Statement

Copyright 2011 SGEM

Official URL: http://dx.doi.org/10.5593/SGEM2011/S03.152

Abstract

The Chah Zard Ag-Au epithermal deposit is located within an andesitic to rhyolitic volcanic complex in central part of Urumieh-Dokhtar Magmatic Arc (UDMA), west- central Iran. The deposit is formed in breccia bodies dominantly hosted by rhyolite porphyries. Geological field relationships show that epithermal mineralization occurred in close association with a phreatomagmatic fracturing event, being localized in breccia cements, and formed as disseminated sulfides in the matrix of the more permeable breccias, and in veins cutting breccia bodies. No volcanic and/or subvolcanic flow and domes have been observed to cross-cut zones of alteration, phreatomagmatic breccias or veining. The volcanic rocks are high K, calc-alkaline, and show rare earth and trace elements features characteristic of arc magmatism. Zircons extracted from intermediate and felsic volcanic rocks of the Chah Zard deposit yield concordant U-Pb ages of 6.290.29, 6.250.29 and 6.190.24 Ma, and a mean age of 6.240.16 Ma. This age is interpreted to represent the maximum age of mineralization of the Chah Zard deposit, and may indicate that there was a previously unrecognized mineralization event in UDMA. Galena mineral separates from the breccia cements and veins have uniform lead isotope ratios of 206Pb/204Pb=18.71-18.77, 207Pb/204Pb=15.61-15.73, and 208Pb/204Pb=38.95-39.01, implying derivation of Pb from a homogeneous upper crustal source.

Item Details

Item Type:Refereed Conference Paper
Keywords:breccia, Chah Zard, epithermal, Iran, U-Pb
Research Division:Earth Sciences
Research Group:Geology
Research Field:Geochronology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Zaw, K (Professor Khin Zaw)
Author:Meffre, S (Dr Sebastien Meffre)
ID Code:120134
Year Published:2011
Deposited By:CODES ARC
Deposited On:2017-08-11
Last Modified:2017-10-05
Downloads:0

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