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Compositional characteristics and geodynamic significance of late Miocene volcanic rocks associated with the Chah Zard epithermal gold–silver deposit, southwest Yazd, Iran

Kouhestani, H, Ghaderi, M, Emami, MH, Meffre, S ORCID: 0000-0003-2741-6076, Kamenetsky, V ORCID: 0000-0002-2734-8790, McPhie, J, Zaw, K ORCID: 0000-0003-0503-3461 and Bezenjani, RN 2018 , 'Compositional characteristics and geodynamic significance of late Miocene volcanic rocks associated with the Chah Zard epithermal gold–silver deposit, southwest Yazd, Iran' , Island Arc, vol. 27, no. 1 , pp. 1-15 , doi: 10.1111/iar.12223.

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Abstract

Whole-rock geochemical and Sr–Nd isotopic data are presented for late Miocene volcanic rocks associated with the Chah Zard epithermal Au–Ag deposit in the Urumieh-Dokhtar Magmatic Arc (UDMA), Iran, to investigate the magma source, petrogenesis and the geodynamic evolution of the study area. The Chah Zard andesitic to rhyolitic volcanic rocks are characterized by significant Large Ion Lithophile Element (LILE) and Light Rare Earth Element (LREE) enrichment coupled with High Field Strength Element (HFSE) depletion. Our geochemical data indicate an adakitic-like signature for the volcanic rocks (e.g. SiO2 > 62 wt%, Al2O3 > 15 wt%, MgO  70, La/Yb > 35, Yb 87Sr/86Sr(i) ratios range from 0.704 902 to 0.705 093 and the εNd(i) values are from +2.33 to +2.70. However, the rhyolite porphyry represents the final stage of magmatism in the area and has a relatively high 87Sr/86Sr ratio (0.705 811). Our data suggest that the andesitic magmas are from a heterogeneous source and likely to result from partial melting of a metasomatized mantle wedge associated with a mixture of subducted oceanic crust and sediment. These melts subsequently underwent fractional crystallization along with minor amounts of crustal assimilation. Our study is consistent with the model that the volcanic host rocks to epithermal gold mineralization in the UDMA are genetically related to late Miocene Neo-Tethyan slab break-off beneath Central Iran.

Item Type: Article
Authors/Creators:Kouhestani, H and Ghaderi, M and Emami, MH and Meffre, S and Kamenetsky, V and McPhie, J and Zaw, K and Bezenjani, RN
Keywords: zircon, gold
Journal or Publication Title: Island Arc
Publisher: Blackwell Publishing Asia
ISSN: 1038-4871
DOI / ID Number: 10.1111/iar.12223
Copyright Information:

Copyright 2017 John Wiley & Sons Australia, Ltd.

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