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PETROLOGY AND GEOCHEMISTRY OF INTRUSIVE ROCKS FROM THE SOUTH OF NAQADEH, WEST AZERBAIJAN, IRAN

The intrusive rocks of Naqadeh are features of Laramide magmatism in the Sanandaj–Sirjan zone. According to petrographic studies, the composition of intrusions consist of acidic, intermediate, and basic rocks. including syenogranites, monzogranite, granodiorites, quartz diorites, quartz monzonites, quartz monzonite, quartz syenite, and olivine gabbro—in order of abundance. Minerals forming intrusive rocks include alkali feldspar (orthoclase and microcline), quartz, plagioclase (andesine to anorthite), amphibole (magnesiohornblende to tschermakite hornblende), pyroxene (diopside), olivine (hyalosiderite to hortonlite), apatite, titanite, zircon, muscovite, and opaque minerals. The chemical analysis of the granitoids revealed their potassium-rich calc-alkaline nature, falling within the meta-alumin to per-alumin range in terms of alumin saturation. Tectonomagmatic diagrams for the studied rocks suggest that they are compatible with granitoids of the continental-subduction zone. Primitive-mantle- and chondrite-normalized spider diagrams indicated no depletion in any elements, exhibiting a negative overall slope which is consistent with subduction patterns (negative Ta, Ti, Zr anomalies, and positive K anomaly). Overall, a review of field observations, mineralogy, geochemistry, and diagrams illustrating the sources of granites showed that the intrusive rocks in the study region are, in fact, I-type granite and that the magmatism is a result of the subduction of the oceanic crust, Neotethys, under the Iranian continental crust.


Introduction
The study region stretches

northeast of Iran in West Azerbaijan
Province and is part of the northwestern deformation and ophiolite belt of the Sanandaj-Sirjan zone ( Fig. 1) based on the classification of structural units (Stocklin, 1968) and structuralsedimentary zones (Aghanabati, 2004) of Iran. The zone (150-250 km wide and 1500 km long) features one of the most complex structures in Iran (Alavi, 1994) and houses the Zagros Mountains at its center (Sengor, 1990). Even though the age, nature, and source of these rock masses remain unclear, they provide essential information as regards the geological history of the Sanandaj-Sirjan zone. It is widely believed that the rock masses are mainly of the calc-alkaline granitoid type that formed during the subduction of the Neotethys under the Iranian plate (Sepahi Garw, 2007;Ahmadi Khalaji et al., 1999;Ghalamghash et al., 2009;Yazdi et al., 2017;Khodami and Kamali Shervedani 2018;Novruzov et al., 2019) and following the collision of the Iranian and Arabian Plates. A specific time scale is yet to be presented for these events, but there is a consensus that the subduction process began during the Middle Jurassic. However, the exact time of the continental collision remains in dispute with some authors dating it back to the Late Cretaceous (Berberian and King, 2000; Mohajjel and Fergusson, 1981), whereas others attribute it to the Eocene (Numan, 2000;Ghasemi and Talbot, 2009;Mazhari et al., 2006) and even Miocene (Mohajjel et al., 2003;Omrani et al., 2008). Nonetheless, in the study region, granitoid intrusive rocks from the

Geology
Stretching across 1200 km 2 , the study region spans between the 45°15' and 45°30' E and 36°30' and 37°00' N coordinates, 7 km south of Naqadeh, 30 km east of Piranshahr, and 39 km west of Mahabad (Fig. 2). The oldest rock outcrops in the region include a

Chemistry of Minerals
The albite (Ab) NaAlSizO8, anorthite (An) CaAl2Si2O8, and orthoclase (Or) KAlSi2O8 charts were used to name the feldspars (Deer et al., 1992). According to the results of chemical point analysis, in these rocks, the average plagioclase composition is  (Chivas, 1982;Agemar et al., 1999).  (Deer et al., 1992); b) classification of amphiboles based on the method proposed by Leake et al., 1997; c) Q-J diagram and the standing of pyroxenes in the Quad region (Morimoto et al., 1988); d) classification of the studied pyroxenes and their placement in the hybrid diopside range (Morimoto et al., 1988); e) olivine type identification diagram based on its chemical composition (Deer et al., 1992).

Geochemistry
An advantageous method of petrogenetic interpretation of intrusive rocks is to make use of geochemical data and investigate the changes and ratios of main and rare elements in the rock mass.

Conclusion
Petrographical and field studies show the intrusive rocks south of Moreover, a negative slope was observed in general, which is consistent with the subduction patterns.

Acknowledgments
Authors would like to express their gratitude to the Higher Education Office of the North Tehran Islamic Azad University.