منشأ سیال کانه‌ ساز در کانسار مگنتیت-آپاتیت چغارت، شمال‌ شرق بافق: شواهدی از کانی‌ شناسی، زمین‌ شیمی، ریزدماسنجی و ایزوتوپ‌ های پایدار (O-C و O-H) و ناپایدار (U-Pb و Nd-Sm)

زمین شناسی اقتصادی

مقاله 11، دوره 14، شماره 1 - شماره پیاپی 32، 1401، صفحه 109-155   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.2021.67972.1004

نویسندگان

کیامرث حسینی¹؛ مجید شاه پسندزاده^{* 2}؛ محمد حسین مرادیان بافقی³

¹کارشناسی ارشد، بخش علوم زمین، دانشکده علوم، دانشگاه شیراز، شیراز، ایران

²دانشیار، بخش علوم زمین دانشگاه تحصیلات تکمیلی و فناوری پیشرفته کرمان، کرمان، ایران

³کارشناسی ارشد، شرکت سنگ آهن مرکزی، ایران، بافق، یزد، ایران

چکیده

بررسی‌های سنگ‌شناسی، زمین‌شیمی و ایزوتوپی بر روی کانسنگ مگنتیت- آپاتیت و دگرنهادی‌های آلبیت‌دار کانسار چغارت بیانگر تنوع کانی‌زایی با منشأ متفاوت است. بررسی‌های ایزوتوپ‌های پایدار O-H و ایزوتوپ‌های ناپایدار Nd-Sm بر روی کانی‌های آپاتیت نسل اول مرتبط با کانسنگ مگنتیت و نسبت‌های Sr در مقابلMn  در هر دو نسل آپاتیت، منشأ رسوبی آنها را نشان می‌دهد. از طرف دیگر، بررسی‌های ریزدماسنجی بر روی میان‌بارهای سیال در آپاتیت نسل اول و ایزوتوپ‌های پایدار O-C بر روی کلسیت‌های هم‌یافت با آلبیت‌های نسل دوم و سوم در پهنه‌های دگرنهادی و وجود بافت‌های برون‌رستی ایلمنیت در کانی مگنتیت، تلفیقی از فراینـدهای ماگمایی و گرمابی دما بالا را به نمایش می‌گذارد. تفاوت سنی آپاتیت‌های نسل اول و مونازیت‌های مرتبط با این آپاتیت‌ها به روش ²³⁸U/²⁰⁶Pb و ²⁰⁷Pb/²⁰⁶Pb نشان‌دهنده عملکرد سیالات کانی‌زا در بازه‌های زمانی مختلف است. بر اساس پژوهش، کانی‌زایی در کانسار مگنتیت- آپاتیت چغارت منشأ چندزادی دارد. این مسئله نقشی مهم در درک فرایندهای کانی‌زایی و مدل‌های اکتشافی کانسارهای آهن-فسفات گستره معدنی بافق دارد.

کلیدواژه‌ها

زمین‌ شیمی؛ سیال کانه‌ ساز؛ کانسار مگنتیت- آپاتیت چغارت؛ بافق؛ ایران مرکزی

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