زمین شیمی و جایگاه تکتونوماگمایی سنگ مادر متاولکانیک های مجموعه دگرگونی حلب (جنوب باختر دندی، استان زنجان)

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشگاه زنجان

2 سازمان زمین‌ شناسی سوئد

چکیده

منطقه دگرگونی حلب در بخش خاوری پهنه دگرگونی تکاب- تخت­ سلیمان- انگوران واقع‌شده و متشکل از تناوب شیست­‌های پلیتی، مافیک و فلسیک ­همراه با میان­ لایه­‌هایی از ریولیت میلونیتی، مرمر و کوارتزیت مربوط به پرکامبرین است که در حد رخساره آمفیبولیت و شیست سبز دگرگون شده‌­اند. شیست­‌های مافیک شامل اکتینولیت شیست، هورنبلند شیست و آمفیبول شیست و شیست‌های فلسیک شامل آلبیت کوارتز شیست، بیوتیت کوارتز شیست و آمفیبول بیوتیت کوارتز شیست هستند. بر اساس بررسی‌های زمین‌شیمیایی، سنگ مادر شیست‌های مافیک از نوع بازالت، آندزیت‌ بازالتی و تراکی‌ بازالت و سنگ مادر شیست­‌های فلسیک از نوع ریولیت بوده­ و ماهیت کالک‌‌آلکالن پتاسیم متوسط تا بالا نشان می‌­دهند. الگوی عناصر کمیاب و کمیاب خاکی بیانگر غنی‌شدگی در LILE به‌همراه آنومالی مثبت Pb و آنومالی منفی HFSE برای هر دو نوع شیست فلسیک و مافیک است. نتایج این بررسی‌ها نشان می­‌دهد که سنگ مادر شیست‌های مافیک حاصل ذوب‌بخشی یک گوشته متاسوماتیسم ­شده در نتیجه فرورانش، در محیط کششی داخل کمانی بوده و شیست­‌های فلسیک محصول ذوب‌‌بخشی پوسته قاره­‌ای توسط ماگمای بازالتی مزبور هستند.

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