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Zircon U–Pb ages and petrogenesis of late Miocene adakitic rocks from the Sari Gunay gold deposit, NW Iran

Published online by Cambridge University Press:  26 April 2021

Hossein Shahbazi Open the ORCID record for Hossein Shahbazi [Opens in a new window] ,
Yasaman Taheri Maghami ,
Hossein Azizi ,
Yoshihiro Asahara ,
Wolfgang Siebel ,
Mohammad Maanijou  and
Ali Rezai
Hossein Shahbazi*
Affiliation:
Department of Geology, Faculty of sciences, Bu-Ali Sina University, Hamedan, Iran
Yasaman Taheri Maghami
Affiliation:
Department of Geology, Faculty of sciences, Bu-Ali Sina University, Hamedan, Iran
Hossein Azizi
Affiliation:
Department of Mining Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran
Yoshihiro Asahara
Affiliation:
Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya464-8601, Japan
Wolfgang Siebel
Affiliation:
Institute of Earth and Environmental Sciences, Albert-Ludwig University Freiburg, Freiburg79104, Germany
Mohammad Maanijou
Affiliation:
Department of Geology, Faculty of sciences, Bu-Ali Sina University, Hamedan, Iran
Ali Rezai
Affiliation:
Department of Geology, Faculty of sciences, Bu-Ali Sina University, Hamedan, Iran
*
*Author for correspondence: Hossein Shahbazi, Email: [email protected]
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Abstract

Late Miocene volcanic rocks host the Sari Gunay epithermal gold deposit in NW Iran. These rocks are located within the Hamedan–Tabriz volcanic belt and occupy the northwestern part of the Sanandaj–Sirjan zone (SaSZ). The volcanic rocks span in composition from latite to dacite and rhyolite. Plagioclase, hornblende, biotite and quartz are the main phenocrysts in a fine-grained and glassy matrix. Laser ablation inductively coupled plasma mass spectrometry zircon U–Pb dating yielded crystallization ages of 10.10 ± 0.01 Ma and 11.18 ± 0.14 Ma for rhyolite and dacite, respectively. High ratios of Sr/Y (> 20) and La/Yb (> 20), high contents of Sr (≥ 400 ppm), low contents of MgO (≤ 6 wt%), Y ≤ 18 ppm (c. 16.5 ppm), Yb ≤ 1.9 ppm (c. 1.53 ppm) and weak negative Eu anomalies (Eu*/Eu c. 0.81) are compatible with a high-silica adakitic signature of the rocks. Regarding the location of the study area nearly 100 km from the Zagros suture zone, we argue that delamination of lithospheric mantle beneath the SaSZ has played a key role in the development of the adakitic rocks in a post-collision tectonic regime. The adakitic melts are suggested to have formed by partial melting of delaminated continental lithosphere and/or lower crustal amphibolite following the collision of the Arabian and Iranian plates.

Keywords

Lithosphere delaminationhigh silica adakiteSari Gunay gold depositpost-collisionSanandaj–Sirjan ZoneIran
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 10 , October 2021 , pp. 1733 - 1755
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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