Abstract
The Neogene Andarian volcanic rocks, a part of the Ahar-Arasbaran magmatic zone, are situated in the northwest of Iran. These units are composed of a series of intermediate to acidic volcanic rocks including basaltic andesite, hornblende andesite, andesite, dacite, and rhyodacite. The basaltic andesite and hornblende andesite are mainly comprised of K-feldspar (Or10-63), plagioclase (An5-37), calcic amphibole, clinopyroxene (En45-64 Wo29-54 Fs0-20), and biotite (Mg#: 0.70–0.82). The compositions of biotite, clinopyroxene, and amphibole as well as whole rock chemistry of the Andarian volcanic rocks show calc-alkaline signatures. The amphibole-plagioclase thermometer and Al-in-hornblende barometer data yielded crystallization temperatures of 707–899°C and pressures of 0.5 to 2.9 kbar. The negative Nb, Ta, and Ti anomalies and large ion lithophile element (LILE; Rb, Ba, and Sr) enrichments relative to primitive mantle indicate a subduction setting. Furthermore, the chondrite-normalized rare earth element (REE) patterns show an LREE enrichment with no clear Eu anomaly. Amphibole and clinopyroxene compositions indicate crystallization under strongly oxidizing conditions.
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Acknowledgements
We would like to express our sincere thanks to Dr. Jung-Woo Park (Seoul National University, South Korea) for providing the financial support at LA-ICP-MS analysis. We thank Dr. Alireza Eslami for his support throughout the studies, and Yujin Jegal for her dedicated assistance during the lab work. We are also grateful to Dr. Morteza Jami for editing the English of the final version.
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Namnabat, E., Ghorbani, M., Nakashima, K. et al. Mineral chemistry and Petrology of the Andarian volcanic rocks: insight to the Ahar-Arasbaran magmatic zone, Northwestern Iran. Arab J Geosci 14, 1922 (2021). https://doi.org/10.1007/s12517-021-08246-1
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DOI: https://doi.org/10.1007/s12517-021-08246-1