تحول سازوکار آتشفشانی در بخش میانی کمان ماگمایی ارومیه-دختر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مدیریت مطالعات پایه منابع آب، شرکت آب منطقه‌ای اصفهان، اصفهان، ایران

2 گروه زمین‌شناسی، دانشکده علوم، دانشگاه اصفهان، اصفهان، ایران

چکیده

در این پژوهش پایگاه ژئوشیمی زمین‌مرجع متشکل از 99 آنالیز شیمیایی در طول حدود 200 کیلومتر از بخش میانی کمان ماگمایی ارومیه-‌دختر (از شمال تا شرق اصفهان) مورد کنکاش قرار‌گرفت. این محدوده بین طول­ های جغرافیایی ´15°51 و ´57°52 شرقی و عرض­ های جغرافیایی ´35°32 و ´47°33 شمالی واقع‌شده ­است. این پایگاه داده از بین داده‌های ژئوشیمیایی سنگ کل منتشر‌شده در پهنه مورد بررسی که دو شرط مهم را داشته­ اند، انتخاب شدند. اول اینکه داده ­ها دارای مختصات جغرافیایی صحیح و یا نقشه مختصات­ دار باشند، دوم اینکه آنالیزها توانایی تفکیک سری­ های ماگمایی و تشخیص آداکیت ­ها را داشته­ باشند (عناصر کمیاب Y، Yb، Lu، Sr با دقت مناسب گزارش شده­ اند). این آنالیزها در سه دسته سنی ائوسن، الیگوسن- پلیوسن و پلیو-کواترنر قرار می­ گیرند. یک نمودار جریانی برای شناسایی سری ماگمایی نمونه ­ها طراحی‌شد و کلیه داده­ ها به‌صورت نظام­ مند بر مبنای آن مورد تحلیل قرار گرفتند. نتایج نشان می­ دهد که ماهیت ماگماتیسم فاز اول اغلب کالک‌آلکالن، فاز دوم معمولاً شوشونیتی و فاز سوم اغلب آداکیتی بوده­ است. با استفاده از نمودارهای تعیین درصد ذوب‌بخشی سنگ­های ماگمایی مشخص­شد که نمونه ­های کالک‌آلکالن از ذوب‌بخشی حدود 15 درصد گوه گوشته­ ای اسپینل-گارنت لرزولیت به‌دست آمده‌اند. برآورد می ­شود که نمونه­ های شوشونیتی از ذوب‌بخشی حدود 3 درصد گوه گوشته ­ای با ترکیب اسپینل-‌گارنت لرزولیت حاصل شده­ اند. آداکیت­ ها حاصل ذوب پوسته اقیانوسی فرورانده‌شده هستند و بر اساس درصد ذوب‌بخشی منشأ به دو دسته قابل تفکیک ­اند. دسته اول، نمونه ­های منطقه کجان و کهنگ که از ذوب‌بخشی حدود 10 درصد گارنت آمفیبولیت حاصل شده ­اند و دسته دوم، نمونه­ های منطقه جوشقان- قهرود که نزدیکی بیشتری با سنگ منشأ هورنبلند اکلوژیت دارند، ذوب‌بخشی حدود 6 درصد نشان می ­دهند.
البته باید توجه داشت این تفاسیر برمبنای داده‌های موجود است و در آینده با در دست‌ داشتن داده‌های صحیح مختصات‌دار بیشتر، این پایگاه داده می‌تواند کامل ­تر شده و ارزیابی دقیق­ تری از تحولات ژئوشیمی سنگ ­های آتشفشانی منطقه ارائه نماید.

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