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Geochemical characteristics of igneous rocks associated with Baghu gold deposit in the Neotethyan Torud-Chah Shirin segment, Northern Iran

Niroomand, Shojaeddin and Lentz, David R. and Sepidbar, Fatemeh and Tajeddin, Hossein Ali and Hassanzadeh, Jamshid and Mirnejad, Hassan (2018) Geochemical characteristics of igneous rocks associated with Baghu gold deposit in the Neotethyan Torud-Chah Shirin segment, Northern Iran. Geological Journal . ISSN 0072-1050. (In Press) http://resolver.caltech.edu/CaltechAUTHORS:20190328-180954783

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Abstract

The Baghu gold deposit, hosted by a granitoid stock as well as volcanic rocks, is located in Northern Iran. The igneous rocks consist of granodiorite and granite as well as volcanic rocks, such as basaltic andesite and andesite, which are cut by dioritic dykes. The igneous rocks have metaluminous, high K calc‐alkaline, and island‐arc signatures, characterized by enrichment in large‐ion lithophile elements (LILEs) and depletion in high‐field‐strength elements (HFSEs). Zircon separates yield U–Pb ages of 47, 43, and 38 Ma for the volcanics, granitoid rocks, and dyke, respectively, indicating that the magmatism associated with gold–copper mineralization occurred during the Eocene. The low Ba/Th, Th/Nb, Ba/La, and Th/Yb ratios in igneous rocks indicate that their mantle source was not likely modified by subduction activity. A comparison of La/Sm against La (ppm), similar Th/Nb and Th/Yb, and average (La/Yb)_n ratios to the crust and lower continental crust (LCC) suggests that the magmatism in the Baghu was likely associated with partial melting of juvenile lower crust, induced by north‐westward subduction of the Neo‐Tethys oceanic lithosphere in an extensional setting.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/gj.3397DOIArticle
ORCID:
AuthorORCID
Niroomand, Shojaeddin0000-0001-8349-2896
Mirnejad, Hassan0000-0001-9776-3570
Additional Information:© 2018 John Wiley & Sons. Manuscript received: 30 June 2018. Manuscript revised: 29 October 2018. Manuscript accepted: 29 October 2018. Version of Record online: 19 December 2018.
Funders:
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Subject Keywords:Baghu gold deposit; geochemistry; island arc; lower continental crust; partial melting; zircon U–Pb age
Record Number:CaltechAUTHORS:20190328-180954783
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190328-180954783
Official Citation: Niroomand, S, Lentz, DR, Sepidbar, F, Tajeddin, HA, Hassanzadeh, J, Mirnejad, H. Geochemical characteristics of igneous rocks associated with Baghu gold deposit in the Neotethyan Torud‐Chah Shirin segment, Northern Iran. Geological Journal. 2018; 1– 18. https://doi.org/10.1002/gj.3397
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94276
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:29 Mar 2019 19:56
Last Modified:29 Mar 2019 19:56

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