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U–Pb geochronology and Pb isotope characteristics of the Chahgaz volcanogenic massive sulphide deposit, southern Iran

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Mousivanda, F and Rastad, E and Meffre, S and Peter, J and Solomon, M and Zaw, K (2010) U–Pb geochronology and Pb isotope characteristics of the Chahgaz volcanogenic massive sulphide deposit, southern Iran. International Geology Review (published online 16 June 2010 ). pp. 1-24. ISSN 0020-6814 (In Press)

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Abstract

The Chahgaz Zn–Pb–Cu volcanogenic massive sulphide (VMS) deposit occurs within a metamorphosed bimodal volcano–sedimentary sequence in the south Sanandaj–Sirjan Zone (SSZ) of southern Iran. This deposit is hosted by rhyodacitic volcaniclastics and is underlain and overlain by rhyodacitic flows, volcaniclastics, and pelites. Peperitic textures between rhyodacite flows and contact pelites indicate that emplacement of the rhyodacite occurred prior to the lithification of the pelites. The rhyodacitic flows are calc-alkaline, and show rare earth and trace elements features characteristic of arc magmatism. Zircons extracted from stratigraphic footwall and hanging-wall rhyodacitic flows of the Chahgaz deposit yield concordant U–Pb ages of 175.7 ± 1.7 and 172.9 ± 1.4 Ma, respectively, and a mean age of 174 ± 1.2 Ma. This time period is interpreted to represent the age of mineralization of the Chahgaz deposit. This Middle Jurassic age is suggested as a major time of VMS mineralization within pull-apart basins formed during Neo-Tethyan oblique subduction-related arc volcano-plutonism in the SSZ. Galena mineral separates from the layered massive sulphide have uniform lead isotope ratios of 206Pb/204Pb = 18.604–18.617, 207Pb/204Pb = 15.654–15.667, and 208Pb/204Pb = 38.736–38.769; they show a model age of 200 Ma, consistent with the derivation of Pb from a Late Triassic, homogeneous upper crustal source.

Item Type: Article
Keywords: Chahgaz; VMS; U–Pb; SSZ; Iran
Journal or Publication Title: International Geology Review
Page Range: pp. 1-24
ISSN: 0020-6814
Identification Number - DOI: 10.1080/00206811003783364
Additional Information: The definitive published version is available online at: http://www.tandf.co.uk/journals This is a iFirst article
Date Deposited: 09 Dec 2010 00:39
Last Modified: 31 Jan 2011 04:24
URI: http://eprints.utas.edu.au/id/eprint/10482
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