ویژگی‌های فیزیکوشیمیایی توده نفوذی ساری‌نو و نقش آن در تشکیل سامانه پورفیری طلا–مس (شمال مرند- شمال‌غرب ایران)

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زمین شناسی، دانشکده علوم، دانشگاه تبریز، تبریز، ایران

10.22128/ijcm.2025.3040.1006

چکیده

مجموعه نفوذی پورفیری ساری‌نو با سن الیگومیوسن در کمربند آتشفشانی–نفوذی قره‌داغ در شمال‌غرب ایران واقع است. توده­های آذرین نفوذی نیمه عمیق به درون واحدهای آتشفشانی ائوسن نفوذ کرده‌اند و ترکیب سنگ‌شناسی آنها بر اساس شیمی سنگ کل از دیوریت تا کوارتزمونزونیت متغیر است و در رده گرانیتوئیدهای آهکی قلیایی با پتاسیم بالا قرار می‌گیرند. این سنگ‌ها از نظر شاخص اشباع از آلومین بیشتر متاآلومین بوده و بر پایه خاستگاه، از گرانیتوئیدهای نوع I هستند. توده‌های نفوذی ساری‌نو توسط مجموعه‌ای از دایک‌ها با ترکیب کوارتزمونزونیتی، میکرو‌دیوریتی، داسیتی و تراکی‌داسیتی قطع شده‌اند. اکسیدهای اصلی در نمودارهای هارکر روندهای خطی مشخصی را نشان می‌دهند که بیانگر نقش فرایند جدایش ماگمایی در شکل گیری این سنگ‌هاست. کاهش اصولی MgO، FeOt، CaO، TiO₂،P₂O₅  و تا حدی MnO با افزایش SiO₂، به تبلور بخشی کانی‌های مافیک چون پیروکسن، هورنبلند و پلاژیوکلاز کلسیم‌دار نسبت داده می‌شود. افزایش تدریجی Na₂O و K₂O نیز بیانگر تبلور پیش‌رونده پلاژیوکلاز سدیم‌دار و فلدسپار پتاسیم‌دار است. در نمودار عنکبوتی چندعنصری بهنجار‌شده نسبت به گوشته اولیه، عناصر دارای تمایل بالا به سنگ کره(LILE) ، مانند Cs، Ba، Sr،Rb  و Pb، غنی‌شدگی و عناصر با شدت میدان بالا (HFSE) چون Nb، Ti،P  و Zr، تهی‌شدگی نشان می‌دهند. همچنین، در نمودار بهنجار‌شده نسبت به کندریت، عناصر خاکی نادر سبک (LREE) دارای غنی‌شدگی شدید با نسبت LaN/YbN  بین 33 تا 37 هستند. بر پایه شواهد زمین­شیمیایی عناصر خاکی نادر، ماگمای توده‌های نفوذی ساری‌نو در محیط زمین­ساختی قوس آتشفشانی پس‌برخوردی جای‌گیری کرده‌اند. ترکیب بیوتیت‌های موجود در پهنه دگرسانی پتاسیمی منطقه ساری‌نو در گستره بیوتیت‌های وابسته به سامانه آنیت-سیدروفیلیت قرار دارند. بیوتیت‌های مورد بررسی در گستره بیوتیت‌های منیزیم‌دار هستند و از نوع بیوتیت‌های بازتعادلی محسوب می‌شوند. دماسنجی بیوتیت‌ها دماهایی بین ۷۱۵ تا ۷۴۴ درجه سانتی‌گراد را نشان می‌دهد. همچنین، گریزندگی اکسیژن (ƒO₂) در گستره 6/15- 10 تا 5/16- 10 بار برآورد شده است.

کلیدواژه‌ها


عنوان مقاله [English]

Physicochemical Characteristics of the Sari-Nou Intrusive Body and Its Role in the Formation of the Porphyry Cu–Au System (North Marand - Northwestern Iran)

نویسندگان [English]

  • Hassan Shokohi
  • Nasir Amel
  • Mohsen Moayyed
Department of Geology, Faculty of Science, University of Tabriz, Tabriz, Iran
چکیده [English]

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.

کلیدواژه‌ها [English]

  • Gold-Copper Porphyry
  • Biotite
  • Tectonic Setting
  • Sari-Nou
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