دوره 28، شماره 4 - ( 10-1399 )
جلد 28 شماره 4 صفحات 978-963 |
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Jahangiryar, Alipour, Simmonds, Towalcherlidzeh. Petrological and geochemical study of trace and rare earth elements in the Miardan Gold mineralization, Bostanabad, East Azarbaidjan Province. www.ijcm.ir 2020; 28 (4) :963-978
URL: http://ijcm.ir/article-1-1561-fa.html
URL: http://ijcm.ir/article-1-1561-fa.html
جهانگیریار فاطمه، علیپور صمد، سیمونز وارطان، توالچرلیدزه الکساندر. بررسی سنگ‌شناسی و زمین‌شیمی عناصر فرعی و کمیاب (خاکی نادر) در کانهسازی طلای میاردان، بستان آباد، استان آذربایجان شرقی. مجله بلورشناسی و کانی شناسی ایران. 1399; 28 (4) :963-978
1- دانشگاه ارومیه
2- مرکز تحقیقات علوم‌پایه دانشگاه تبریز
3- گروه زمین شناسی اقتصادی
2- مرکز تحقیقات علوم‌پایه دانشگاه تبریز
3- گروه زمین شناسی اقتصادی
چکیده: (2338 مشاهده)
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.
واژه‌های کلیدی: میاردان، طلای رگهای، زمین شیمی، دگرسانی، عناصر خاکی نادر.
فهرست منابع
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