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

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, h...

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Bibliographic Details
Published in:Geological journal (Chichester, England) England), 2020-01, Vol.55 (1), p.299-316
Main Authors: Niroomand, Shojaeddin, Lentz, David R., Sepidbar, Fatemeh, Tajeddin, Hossein Ali, Hassanzadeh, Jamshid, Mirnejad, Hassan, Somerville, I.
Format: Article
Language:English
Subjects:
Andesite
Baghu gold deposit
Continental crust
Depletion
Eocene
geochemistry
Gold
Igneous rocks
island arc
Lanthanum
Lava
Lithosphere
lower continental crust
Magma
Mineralization
Niobium
Paleoceanography
partial melting
Radiometric dating
Ratios
Subduction
Volcanic rocks
Zircon
zircon U–Pb age
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Summary: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.
ISSN:0072-1050
1099-1034
DOI:10.1002/gj.3397