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U-PB GEOCHRONOLOGY AND PB ISOTOPE CHARACTERISTICS OF CHAH ZARD AG-AU EPITHERMAL DEPOSIT, WEST-CENTRAL IRAN

Majid Ghaderi

First published: 2011-06-20https://doi.org/10.5593/sgem2011/s03.152View metrics

Abstract

The Chah Zard Ag–Au epithermal deposit is located within an a ndesitic 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 s how 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, cal c–alkaline, and show rare earth and trace elements features characteristic of arc magm atism. Zircons extracted from intermediate and felsic volcanic rocks of the Chah Zard deposit yield concordant U–Pb ages of 6.29±0.29, 6.25±0.29 and 6.19±0.24 Ma, and a mean age of 6.24±0.16 Ma. This age is interpreted to represent the maximum age of mineralization of the Chah Zard deposit, and may indicate that there was a previo usly 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.

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Title
U-PB GEOCHRONOLOGY AND PB ISOTOPE CHARACTERISTICS OF CHAH ZARD AG-AU EPITHERMAL DEPOSIT, WEST-CENTRAL IRAN
Authors
Majid Ghaderi
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2011 11th International Multidisciplinary Scientific GeoConference
Publisher
Stef92 Technology
Year
2011
Pages
Not available yet
ISSN
1314-2704
ISBN
Not available yet
Language
en
Publication type
Conference Paper
Keywords
EpithermalbrecciaU–PbChah ZardIran
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