بررسی زمین شیمی عناصر اصلی و جزئی در نهشته منگنز قزل داش داغی، شمال‌ غرب مرند (آذربایجان شرقی)

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشگاه تبریز

2 دانشگاه پیام نور

چکیده

نهشته منگنز قزل­داش داغی در 25 کیلومتری شمال­ غرب شهر مرند در استان آذربایجان شرقی قرار دارد. از نظر ساختاری، این نهشته در پهنه مرکزی واقع‌شده است. میزبان کانی ­زایی در افق I توفیت­ و سنگ‌ آهک آب شیرین و در افق II کنلگومرا و ماسه ­سنگ حوضه آتشفشانی کواترنری است. شکل کانی­ زایی در افق I، لایه ­ای-لامینه ­ای و در افق II، عدسی-‌پرشدگی شکستگی­ هاست. ویژگی‌های زمین ­شیمیایی نهشته توسط مقدار عناصر اکسیدهای اصلی، جزئی مطالعه و منشأ کانی ­زایی بحث‌ شده است. غلظت ­های به نسبت بالای Al (01/0 تا  39/7 درصد وزنی، متوسط = 34/1) احتمالاً به‌خاطر لیتیک توف­ های میزبان است. مقادیر کم تیتانیوم (0 تا 28/0 درصد وزنی، متوسط = 05/0) نشانه ورود اندک مواد آواری طی کانی ­زایی است. داده­ هایی مثل Mn:Fe (متوسط 29/21)، Ba بالا (متوسط 4/1782)،Co:Ni  (متوسط 79/0)، Co:Zn (متوسط 18/1) و نمودارهای تمایز نهشته ­های منگنز نشان می­ دهد که نهشته قزل ­داش داغی کانی­ زایی آتشفشانی­-­رسوبی از نوع گرمابی است.

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