The Miocene Sungun porphyry Cu–Mo systems, located in Azerbaijan belt, NW Iran, is associated with the high-Sr/Y magmas, which were engendered in a post-collisional setting. However, the petrogenesis of these fertile magmas and their mineralisation are still unknown. In this study, we present whole-rock major-trace elements, zircon U–Pb dating and the Lu–Hf isotopes in the ore-forming porphyries of the Sungun porphyry systems. The corresponding results showed that the samples were rich in large-ion lithophile elements and poor in high-field-strength elements; moreover, they presented both high K₂O (2.4–3.5 wt%) and Sr (727–770 ppm) and low Y (11–14 ppm) contents. The zircon U–Pb age of the Sungun porphyry was ~19 Ma, with positive ε_Hf(t) ratios (5.5–11.8) and young T_DM² ages between 322 and 705 Ma. Additionally, the Sungun high-Sr/Y porphyries contained anhydrites (CaSO₄); and had high zircon Ce⁴⁺/Ce³⁺ ratios (33–728), relatively low zircon saturation temperatures (620–804 °C), and plagioclases with excess Al content. Overall, these evidences suggest that a water-fluxed melting of the subduction-modified juvenile lower crust might have generated a high oxygen fugacity, leading to the formation of the hydrous and S-rich Sungun fertile magmas in the NW Urumieh–Dokhtar magmatic Arc.

位于伊朗西北部阿塞拜疆地带的中新世Sungun斑岩Cu-Mo系统与高Sr / Y岩浆有关，这些岩浆是在碰撞后形成的。然而，这些肥沃的岩浆的成岩作用及其矿化作用仍然未知。在这项研究中，我们介绍了Sungun斑岩系统中成矿斑岩中的全岩主痕量元素，锆石U-Pb测年和Lu-Hf同位素。相应的结果表明，样品中富含大离子亲石元素，而高场强元素较弱；此外，他们呈现出高的K ₂ O（2.4–3.5 wt％）和Sr（727–770 ppm）和低的Y（11–14 ppm）含量。所述Sungun斑岩的锆石年龄为19〜马，具有正ε_的Hf（t）的比（5.5-11.8）和年轻Ť _DM^2个年龄段在322至705 Ma之间。此外，Sungun高Sr / Y斑岩中还含有硬石膏（CaSO ₄）。并具有较高的锆石Ce ⁴⁺ / Ce ³⁺比（33–728），较低的锆石饱和温度（620–804°C）和铝含量过多的斜长石。总体而言，这些证据表明，俯冲改造后的下部地壳的水熔熔化可能产生了高的氧气逸度，从而导致西北部Urumieh–Dokhtar岩浆弧中形成了含水和富含S的Sungun肥沃岩浆。