Physicochemical Characteristics of the Sari-Nou Intrusive Body and Its Role in the Formation of the Porphyry Cu–Au System (North Marand - Northwestern Iran)
2
Department of Geology, Faculty of Natural Sciences, University of Tabriz
3
The University of tabriz
10.22128/ijcm.2025.3040.1006
Abstract
The Sari-Nou porphyry intrusive complex, of Oligo-Miocene age, is located in the Qaradagh volcanic–plutonic belt, NW Iran. These semi-deep plutonic bodies intruded into Eocene volcanic units. Their composition ranges from diorite to quartz monzonite, belonging to high-K calc-alkaline granitoids, mainly metaluminous, and of I-type affinity. The intrusions are crosscut by quartz monzonitic, microdioritic, dacitic, and trachydacitic dikes. Harker diagrams indicate magmatic differentiation; decreasing MgO, FeOt, CaO, TiO₂, P₂O₅ with increasing SiO₂ reflects crystallization of pyroxene, hornblende, and calcic plagioclase, while increasing Na₂O and K₂O suggests crystallization of sodic plagioclase and K-feldspar. Spider diagrams show LILE enrichment (Cs, Ba, Sr, Rb, Pb) and HFSE depletion (Nb, Ti, P, Zr). LREE are highly enriched with LaN/YbN ratios of 33–37. Geochemical evidence indicates emplacement in a post-collisional arc setting. Biotites from the potassic alteration zone are Mg-rich re-equilibrated types, with temperatures of 715–744 °C and ƒO₂ between 10⁻¹⁵·⁶ and 10⁻¹⁶·⁵ bars.
Shokohi, H., Amel, N., & Moayyed, M. (2025). Physicochemical Characteristics of the Sari-Nou Intrusive Body and Its Role in the Formation of the Porphyry Cu–Au System (North Marand - Northwestern Iran). Iranian Journal of Crystallography and Mineralogy, (), -. doi: 10.22128/ijcm.2025.3040.1006
MLA
Hassan Shokohi; Nasir Amel; Mohsen Moayyed. "Physicochemical Characteristics of the Sari-Nou Intrusive Body and Its Role in the Formation of the Porphyry Cu–Au System (North Marand - Northwestern Iran)", Iranian Journal of Crystallography and Mineralogy, , , 2025, -. doi: 10.22128/ijcm.2025.3040.1006
HARVARD
Shokohi, H., Amel, N., Moayyed, M. (2025). 'Physicochemical Characteristics of the Sari-Nou Intrusive Body and Its Role in the Formation of the Porphyry Cu–Au System (North Marand - Northwestern Iran)', Iranian Journal of Crystallography and Mineralogy, (), pp. -. doi: 10.22128/ijcm.2025.3040.1006
VANCOUVER
Shokohi, H., Amel, N., Moayyed, M. Physicochemical Characteristics of the Sari-Nou Intrusive Body and Its Role in the Formation of the Porphyry Cu–Au System (North Marand - Northwestern Iran). Iranian Journal of Crystallography and Mineralogy, 2025; (): -. doi: 10.22128/ijcm.2025.3040.1006
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