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Zircon U–Pb ages, geochemistry and Sr–Nd isotopes of the Golshekanan granitoid, Urumieh–Dokhtar magmatic arc, Iran: evidence for partial melting of juvenile crust

Published online by Cambridge University Press:  15 December 2020

Fatemeh Sarjoughian Open the ORCID record for Fatemeh Sarjoughian [Opens in a new window] ,
Bahareh Zahedi ,
Hossein Azizi ,
Wenli Ling ,
David R. Lentz  and
Yoshihiro Asahara
Fatemeh Sarjoughian*
Affiliation:
Department of Earth Sciences, Faculty of Sciences, University of Kurdistan, Sanandaj, Iran
Bahareh Zahedi
Affiliation:
Department of Earth Sciences, Faculty of Sciences, University of Kurdistan, Sanandaj, Iran
Hossein Azizi
Affiliation:
Department of Mining engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran
Wenli Ling
Affiliation:
Faculty of Earth Sciences, China University of Geosciences, Wuhan430074, China
David R. Lentz
Affiliation:
Department of Earth Sciences, University of New Brunswick, Fredericton, NBE3B 5A3, Canada
Yoshihiro Asahara
Affiliation:
Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
*
Author for correspondence: Fatemeh Sarjoughian, Email: [email protected]
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Abstract

The Golshekanan granitoid body is situated in the central part of the Urumieh–Dokhtar magmatic arc (UDMA) in central Iran, and includes granite and granodiorite with minor monzonite and diorite. Zircon U–Pb dating yields a late Eocene (Priabonian) crystallization age of 37.6 ± 0.2 Ma. The body is calc-alkaline and metaluminous to weakly peraluminous (A/CNK ≤ 1.10) with SiO2 ranging from 61.1 to 71.5 wt% and MgO from 0.8 to 3.3 wt%, with Na2O + K2O of 4.0–8.5 wt%. Primitive mantle-normalized trace-element patterns display enrichments in the large-ion lithophile elements (LILE), such as Rb, Cs, Ba and K, and depletion from the high-field-strength elements (HFSEs), such as Nb, Ti, Ta and P. The rocks are enriched in LREEs relative to HREEs (average (La/Yb)CN = 4.3) and exhibit weak negative Eu anomalies (average Eu/Eu* = 0.75), revealing typical active continental margin arc affinity. The low initial 87Sr/86Sr ratios (0.70440–0.70504) and notable positive ϵNd(t) values (+4.0 to +5.2) indicate an origin by partial melting of juvenile rocks in the lower crust, possibly with some involvement of sub-continental lithospheric mantle beneath Central Iran. These processes probably occurred due to the Neo-Tethys oceanic slab retreat and (or) rollback during late Eocene time.

Keywords

active continental margingranitoidSr–Nd isotope ratiosjuvenile crustNeo-Tethys subductionUrumieh–Dokhtar magmatic arcIran
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 7 , July 2021 , pp. 1289 - 1304
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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