ژئوشیمی و منشاء عناصر در معادن زغالسنگ تریاس فوقانی اولنگ، شمال شرق ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

عضو هئیت علمی دانشکده علوم زمین، دانشگاه دامغان

چکیده

این مطالعه به بررسی مدل رخداد و توزیع عناصر اصلی و فرعی نهشته‌های زغالسنگی منطقه اولنگ با سن تریاس بالایی واقع در شمال شرق ایران می‌پردازد. نمونه‌های زغال‌سنگی از 9 لایه زغال‌سنگی منطقه اولنگ جمع‌آوری و به خاکستر تبدیل شدند. غلظت عناصر در خاکستر زغالسنگ‌های منطقه اولنگ بیشتر از مقدار کلارک و همچنین بیشتر از میانگین خاکستر زغالسنگ‌های جهان می‌باشد. عناصر اصلی و فرعی لایه‌های زغال‌سنگی منطقه اولنگ بر اساس ضرایب همبستگی‌شان با بازده خاکستر در چهار گروه (Rb, K, Cs, Si)A ، (Al)B ، (Tl, Ca, Nb, Ta,V)C و (Cr, Hf, Sn, Zr, Th, Zn, Ti, Ba, W, Mg, Na, P, Sr, Co, Cu, Mo, Ni, U, Fe, Ca)D جای می‌گیرند. دو گروه اول ضریب همبستگی قوی با درصد حاکستر نشان می دهند و عمدتا دارای قرابت غیر آلی می‌باشند.بر اساس آنالیز همبستگی، آنالیز خوشه‌ای و ویژگی‌های توزیع عناصر نادر خاکی دو شکل رخدادی مجزا برای این عناصر می‌توان در نظر گرفت: 1) همراهی این عناصر با کانی‌های فسفاته‌ای چون مونازیت یا مواد آلی فسفاته. 2) همراهی با گروه ماسرالی ویترینیت.

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