نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران

2 کارشناسی ارشد، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران

چکیده

کمربند ماگمایی ارومیه - دختر به موازات زمین‌درز زاگرس و در نتیجه فرورانش لیتوسفر اقیانوسی نئوتتیس به زیر حاشیه جنوبی اورازیا تشکیل شده است. سنگ‌های آتشفشانی مورد تحقیق در محدوده رزن- آوج بخشی از ماگماتیسم نوار ارومیه – دختر هستند. این سنگ‌ها شامل الیوین‌بازالت، بازالت تا معدودی تراکی‌آندزیت با ماهیت آلکالن هستند. روابط چینه‌شناختی میان‌لایه‌ای افق‌های ‌آتشفشانی با رسوبات سازند قم موید سن الیگومیوسن آنهاست. تمرکز عناصر اصلی و کمیاب سنگ‌های آتشفشانی و مدلسازی شیمیایی نشان‌دهنده نقش بارز فرایند تبلور تفریقی (35 تا 45 درصد) با مشارکت کانی‌های الیوین، کلینوپیروکسن و پلاژیوکلاز در تحول ترکیب مذاب است. شیمی سنگ کل این سنگ‌ها نشان‌دهنده غنی‌شدگی زیاد LREE/HREE و نبود تهی‌شدگی HFSE همانند مذاب‌های OIB است. به نظر می‌رسد پس از فعالیت ماگمایی گسترده ائوسن در نوار- ارومیه دختر که مشخصات بارز ماگماتیسم قوسی دارد، در الیگومیوسن منشأ مذاب‌ها به گوشته عمیق‌تر آستنوسفری تغییر پیدا کرده است. احتمالاً پس از آغازین مراحل برخورد پلیتی عربی- اوراسیایی در ائوسن پایانی- الیگوسن آغازی و عقبگرد لیتوسفر فرورونده، جریانی از گوشته آستنوسفری به درون گوه گوشته‌ای تزریق شده و به طور ضعیفی تحت تأثیر مواد فرورانشی قرار گرفته است که باعث شکل‌گیری مذاب‌های الیگومیوسن شده است.

کلیدواژه‌ها

موضوعات

کتابنگاری
علی‌پور، ر.، صدر، ا.ح.،  قمریان، س.، 1396-  تحلیل زمین‌ساختی منطقه آوج- آبگرم با استفاده از روش‌های سنجش از دور و تحلیل الگوی فرکتالی، شمال باخترایران. مجله علوم زمین. سال بیست و هفتم. شماره 106. صفحات 203-216.
قاسمی، ح، ر.، 1384-  لیتواستراتیگرافی و بیواستراتیگرافی سازند قم در ناحیه آوج، پایان نامه کارشناسی ارشد. دانشگاه خوارزمی تهران.
دلاوری، م.، رضایی، پ.، دولتی، ا.، 1396- ماگماتیسم ائوس  نوار ارومیه‌دختر در شمال ساوه: تنوع مجموعه‌های ولکانیک در یک محیط کششی؛ مجله پژوهش‌های دانش زمین، دوره8، شماره 2، بهار 1396، پیاپی 30. ص. 1-18. Dor: 20.1001.1.20088299.1396.8.2.1.1  .
 
Abstract
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