فصلنامه علمی علوم زمین

فصلنامه علمی علوم زمین

منبع و تحول سیال کانسنگ‌ساز در ذخایر اکسیدآهن-آپاتیت ناحیه بافق، ایران مرکزی: رهیافتی بر پایه نسبت های ایزوتوپی گوگرد پیریت و اکسیژن مگنتیت

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه زمین‌شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران
2 دانشکده مهندسی منابع طبیعی، محیط زیست و عمران، گروه علوم زمین و مهندسی محیط زیست دانشگاه صنعتی لولئو، لولئو، سوئد
10.22071/gsj.2026.578346.2247
چکیده
کانسارهای اکسیدآهن-آپاتیت ناحیه بافق، ایران مرکزی، با وجود چند ویژگی مشترک، از نظر سنگ میزبان و دگرسانی آن، بافت، کانی‌شناسی و ویژگی‌های ژئوشیمیایی کانسنگ، تفاوت‌هایی دارند که بازتاب‌دهنده پیچیدگی فرایندهای کانی‌سازی و زایش آنها است. به‌منظور بررسی منبع و تحول سیال کانه‌ساز در این ذخایر، از داده‌های ایزوتوپی اکسیژن مگنتیت و گوگرد پیریت از کانسنگ‌های مختلف توده‌ای، رگه‌ای، نواری، انباشتی و برشی استفاده شده‌است. ترکیب ایزوتوپی اکسیژن مگنتیت در کانسارهای چادرملو، گزستان، میشدوان، لک‌سیاه و سه‌چاهون، از 0/7+ تا 8/2+ تغییر می‌کند. مقدار δ¹⁸O مگنتیت‌های توده‌ای و رگه‌ای، بین 0/7+ تا4/4+ است که با تبلور از سیالات ماگمایی و کانی سازی در دماهای بالا سازگار است. مقدار 3/9+ برای کانسنگ‌نواری میشدوان، که همراه با مواد آذرآواری است، نشانگر سهم مهم سیال‌های ماگمایی است. ترکیب ایزوتوپی مگنتیت در کانسنگ انباشتی چادرملو، 5/2+ به دست آمد که به تشکیل در شرایط ماگمایی و دما-بالا اشاره دارد؛ در حالی که مقادیر بالاتر (تا 8+) برای کانسنگ نواری گزستان و لک‌سیاه، می‌تواند بازتاب فرایندهای رسوبی- دیاژنتیکی یا جانشینی در بستر دریا باشد. ترکیب ایزوتوپی گوگرد پیریت در کانسنگ‌های توده‌ای، برِشی و رگه‌ای، دامنه‌ای گسترده از 4+ تا 30+ دارد که می تواند نشانگر نقش منابع گوگرد متفاوت با چیرگی خاستگاه غیرماگمایی باشد. دامنه وسیع داده‌های ایزوتوپی اکسیژن و گوگرد، نشان دهنده تحول چندمرحله‌ای کانی سازی با مشارکت سیال‌هایی از منابع ماگمایی و غیرماگمایی است. این تفسیر با دامنه گسترده دمای همگن شدن و شوری میانبارهای سیال از ذخایر مختلف و حتی در یک ذخیره خاص در ناحیه بافق پشتیبانی می‌شود.
کلیدواژه‌ها
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دوره 36، شماره 2 - شماره پیاپی 140
تابستان 1405، سال سی‌و ششم، شماره 2، پیاپی 140
تابستان 1405
صفحه 103-122