بررسی سنگ‌شناسی و زمین‌شیمی عناصر فرعی و کمیاب (خاکی نادر) در کانه‌سازی طلای میاردان، بستان آباد، استان آذربایجان شرقی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه ارومیه

2 مرکز تحقیقات علوم‌پایه دانشگاه تبریز

3 گروه زمین شناسی اقتصادی

چکیده

منطقه کانی­زایی طلای میاردان در 15 کیلومتری غرب شهرستان بستان آباد در استان آذربایجان شرقی واقع است. واحدهای سنگی عمده منطقه شامل توف و گدازه های آندزیتی وابسته به ائوسن بوده که میزبان کانی­سازی رگه­ای طلا هستند. کانه­زایی طلا در درون سنگ­های آندزیتی دگرسان،خرد شده و برشی شده به سن ائوسن دربرخوردگاه با استوک دیوریت پورفیری شکل گرفته است. این سنگ­ها توسط محلول­های گرمابی دستخوش دگرسانی سیلیسی و سریسیتی شده­ و در اثر فرآیند دگرنهادی ناشی از تزریق توده نفوذی، به کوارتزیت و هورنفلس تبدیل شده­اند. کانه­سازی طلا در این واحدها به شکل پهنه­های سیلیسی و رگه­های کوارتزی دارای سولفید با راستا 300 تا 320 درجه شمال غربی و باشیب نزدیک به عمود  صورت گرفته است. نمودارهای عنکبوتی عناصر خاکی نادر بهنجار شده نسبت به کندریت و گوشته اولیه نشان دهنده جدایش عناصر خاکی نادر سبک (LREE) از عناصر خاکی نادر سنگین (HREE) و غنی­شدگی LREE ها و عناصر سنگ دوست یون (LILE) است. شاخص­های زمین شیمیایی مانند Ti+Fe و Ce+Y+La)-(Ba+Sr)) نشان می­دهند که محلول­های گرمابی برون­زاد نقش بسیار مهمی در گسترش پهنه های دگرسانی و کانه­زایی در این منطقه داشته­اند.

کلیدواژه‌ها

عنوان مقاله [English]

Petrological and geochemical study of trace and rare earth elements in the Miardan Gold mineralization, Bostanabad, East Azarbaidjan Province

نویسندگان [English]

  • Jahangiryar 1
  • Alipour 1
  • Simmonds 2
  • Towalcherlidzeh 3
1
2
3
چکیده [English]

The Miardan gold deposit is located near the Miardan village, 15 km west of the Bostan Abad town in the East Azarbaidjan Province. The main rock units in the area include andesitic tuffs and lavas of Eocene age, which host vein-type gold mineralization. The orebody is formed within the altered, crushed and sheared andesitic rocks, in contact with porphyry diorite stock. These rocks have been subjected to siliceous and sericitic alteration by hydrothermal fluids and converted to quartzite and hornfels under the metasomatism related to the intrusive body. Gold mineralization within these rocks occurs as almost vertical sulfide-bearing silicic zones and quartz veins with N300W to N320W trend. Chondrite and primitive mantle-normalized spider diagrams of trace and rare earth elements indicate differentiation of LREE from HREE and enrichment of LREEs. Geochemical indices, such as TiO2 and (Ce+Y+La)-(Ba + Sr), show that supergene fluid played the most important role in the development of alteration zones and mineralization in this area.

کلیدواژه‌ها [English]

  • Miardan
  • vein-type gold
  • Geochemistry
  • alteration
  • rare earth elements

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  • تاریخ دریافت: 15 بهمن 1398
  • تاریخ بازنگری: 03 فروردین 1399
  • تاریخ پذیرش: 31 فروردین 1399

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