بررسی شکل‌گیری و خاستگاه سیال‌های کانه‌ساز در رگه‌های سیلیسی طلادار نقدوز، استان آذربایجان‌شرقی، شمال‌غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تبریز

2 دانشگاه محقق اردبیلی

چکیده

منطقه امیدبخش طلای نقدوز به‌عنوان بخشی از پهنه  فلززایی ارسباران در حدود 20 کیلومتری شرق شهرستان اهر، استان آذربایجان‌شرقی واقع است. سنگ میزبان کانی‌سازی سنگ­هایی با ترکیب آندزیت- تراکی‌آندزیت و با سن ائوسن پسین هستند. پهنه‌های دگرسانی رخنمون یافته در این منطقه به‌طور عمده شامل سیلیسی، آرژیلی و پروپیلیتی هستند. پیریت کانی سولفیدی عمده درونزاد است که به‌مقدار کمتر توسط کالکوپیریت و بورنیت همراهی می‌شود. مهمترین کانی­های برونزاد در این منطقه اکسی- هیدروکسیدهای آهن (هماتیت، لیمونیت و گوتیت) و مالاکیت هستند که مجموعه کانیایی درونزاد را همراهی می‌کنند. کانه‌زایی طلا در این منطقه در رگه-رگچه‌های کوارتز- سولفیدی رخ داده است. نتایج ریزدماسنجی میانبارهای سیال اولیه دوفازی (L+V) موجود در کانی کوارتز وابسته به کانی‌سازی نشان دهنده تشکیل این نوع کانی‌سازی در دمای حدود 160 تا 334 درجه سانتی‌گراد از سیالی با شوری پایین (53/0 تا 39/3 درصد وزنی معادل نمک طعام) است. حضور برش­های گرمابی، شبه ریخت کوارتز پس از کلسیت تیغه‌ای و میانبارهای سیال تک‌فاز بخار بیانگر جوشش سیال گرمابی مسئول کانه‌زایی هستند. نتایج بررسی ایزوتوپی گوگرد بر پیریت نشان داد که مقادیر ترکیب ایزوتوپی این عنصر در گستره خاستگاه ماگمایی هستند. همچنین یافته‌های ایزوتوپی اکسیژن و هیدروژن نشان می‌دهند که آب­های جوی سهم عمده‌ای ‌در تشکیل سیال­های کانه‌دار در نقدوز داشته‌اند. حضور شواهد ساختی و بافتی به‌همراه اطلاعات ریزدماسنجی میانبارهای سیال (شوری و دمای همگن‌شدگی) نشان می­دهد که کانی‌سازی طلا در منطقه اکتشافی نقدوز از نوع فراگرمایی است.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of genesis and fluid origin in Noghduz gold bearing quartz veins, East Azarbaijan Province, northwest of Iran

نویسندگان [English]

  • Azam Sadat Miranvari 1
  • AliAsghar Calagari 1
  • Kamal Siahcheshm 1
  • Ghahraman Sohrabi 2
1 University of Tabriz
2 University of Mohaghegh
چکیده [English]

The Noghduz  prospecting area, as a part of the Arasbaran metallogenic zone is located about 20 km east of Ahar, East-Azarbaijan Province. The mineralization host rocks are andesite-trachy andesite with the age of  Late  Eocene. The hydrothermal alterations exposed in this area are silicic, argillic, and propylitic. Pyrite is the main hypogene sulfide mineral which is accompanied by lesser amounts of chalcopyrite and bornite. The most important supergene minerals in this area are iron oxyhydroxides (hematite, limonite and goethite) and malachite that accompany the hypogene mineral assemblage. Gold mineralization occurred within quartz-sulfide veins/veinlets in this area. The microthermometric measurements in the primary 2-phase (L+V) fluid inclusions in quartz crystals associated with  mineralization  indicate that  the mineralizing fluids had temperatures and salinities within the range of 160-334°C and 0.53-3.39 wt% NaCl equivalent. respectively. The presence of hydrothermal breccias, pseudomorph of quartz after bladed calcite, and mono-phase gas inclusions are indicative of boiling of the hydrothermal fluids responsible for mineralization. The sulfur isotopic analysis of pyrite shows  that  the values of isotopic composition of this element  is  close to the range of magmatic source. Also, the oxygen and hydrogen isotopic data demonstrated that  the meteoric waters constituted a great portion of the ore-bearing fluids at Noghduz area. The presence of structural and textural evidence along with fluid inclusion studies (salinity and homogenization temperature) indicate that the gold mineralization at Noghduz area is of epithermal type.

کلیدواژه‌ها [English]

  • fluid inclusions
  • stable isotopes
  • epithermal gold
  • Noghduz
  • Ahar
  • East-Azarbaijan

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  • تاریخ دریافت: 02 مرداد 1397
  • تاریخ بازنگری: 07 آبان 1397
  • تاریخ پذیرش: 14 آذر 1397

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