بررسی زمین‌شیمیایی پهنه‌های دگرسانی پیرامون رگه‌های سیلیسی طلادار زایلیک، شرق اهر، استان آذربایجان‌شرقی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تبریز

2 دانشگاه محقق اردبیلی

چکیده

منطقه کانی‌زایی زایلیک در پهنه فلززایی ارسباران در شرق شهرستان اهر، استان آذربایجان‌شرقی واقع است. واحدهای سنگی عمده منطقه، شامل توف و گدازه‌های آندزیتی و تراکی‌آندزیتی وابسته به ائوسن پسین بوده که میزبان کانی‌سازی رگه‌ای طلا هستند. این سنگ­ها توسط محلول­های گرمابی دستخوش دگرسانی بیشتر سیلیسی، آرژیلی، فیلیک (کوارتز- سریسیت) و پروپیلیتی شده‌اند. بررسی زمین­شیمیایی پهنه­های دگرسانی در این منطقه نشان می‌دهد که در پهنه سیلیسی به دلیل ماهیت اسیدی سیال­ها و شستشوی شدید سنگ میزبان، تهی‌شدگی بیشتر عناصر اصلی و فرعی رخ داده است. میزان آبشویی به سمت پهنه پروپیلیتی به دلیل افزایش pH محلول­های دگرسان‌کننده، کمتر شده است. از طرفی، وجود کانی­هایی با جذب سطحی بالا مانند کانی­های رسی باعث تثبیت و تمرکز بسیاری از عناصر در پهنه­های آرژیلی، فیلیک و پروپیلیتی شده است. بررسی رفتار عناصر خاکی نادر (REE) در پهنه­های سیلیسی شده نسبت به سنگ­های آتشفشانی نسبتاً سالم در این منطقه نشان می‌دهد که بیشتر این عناصر دستخوش تهی‌شدگی شده­اند. شاخص‌های زمین­شیمیایی مانند مقدار TiO2 و ((Ce + Y + La) – (Ba + Sr نشان می­دهند که محلول­های گرمابی درونزاد نقش بسیار مهمی در گسترش پهنه­های دگرسانی در این منطقه داشته‌اند.     

کلیدواژه‌ها

عنوان مقاله [English]

Geochemical study of alteration zones around Au-bearing silicic veins at Zailic, East of Ahar, East- Azarbaidjan Province

نویسندگان [English]

  • Azam Sadat Miranvari 1
  • AliAsghar Calagari 1
  • Kamal Siahcheshm 1
  • Ghahraman Sohrabi 2
1
2
چکیده [English]

The Zailic gold-bearing veins are located in the Arasbaran metallogenic zone, east of Ahar, East-Azarbaidjan Province. The most important lithologic units in this area are andesitic and trachy-andesitic tuffs and lavas of Upper Eocene age hosting vein-type gold mineralization. Theses rocks have suffered silicic, argillic, phyllic, and propylitic alterations brought about by hydrothermal fluids. The geochemical study of alteration zones in this area showed that in the silicic zone, due to the acidic nature of altering fluids and hence intense leaching, depletion of most major and trace elements took place. The degree of leaching towards the propylitic zone, owing to the pH increase of the hydrothermal fluids, gradually decreases. The presence of minerals with high adsorption capacity, such as clay minerals, resulted in concentration and fixation of many elements in the argillic, phyllic, and propylitic zones. Consideration of the behavior of rare earth elements (REE) in silicic zone relative to almost fresh volcanic rocks showed that most of REE suffered depletion. Geochemical indices such as TiO2 and (Ce + Y + La)-(Ba + S), showed that the hypogene hydrothermal fluids played an important role in the development of alteration zones at Zailic

کلیدواژه‌ها [English]

  • rare earth elements
  • phylic
  • propylitic
  • argillic
  • silicic
  • alteration
  • Zailic
  • Ahar
  • East-Azarbaidjan

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  • تاریخ دریافت: 05 اردیبهشت 1397
  • تاریخ بازنگری: 07 مرداد 1397
  • تاریخ پذیرش: 26 شهریور 1397

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