دوره 28، شماره 1 - ( 1-1399 )
جلد 28 شماره 1 صفحات 70-51 |
برگشت به فهرست نسخه ها
میثم قلی‌پور1 
، مهرداد براتی* 1، ابراهیم طالع‌فاضل1 ، وراتیسلاو هورای2
، مهرداد براتی* 1، ابراهیم طالع‌فاضل1 ، وراتیسلاو هورای2
1- دانشگاه بوعلی‌سینا
2- موسسه علوم زمین اسلواکی
2- موسسه علوم زمین اسلواکی
چکیده: (2374 مشاهده)
کانسار آهن± آپاتیت لکهسیاه در ایالت فلززایی بافق- ساغند (ایران مرکزی) و در سنگهای میزبان ریولیتی قرار گرفته است. کانیهای اصلی در این کانسار مگنتیت و آپاتیت هستند که کانیهای مونازیت و زنوتیم به صورت میانبار درون بلور و شکستگیهای این دو کانی تشکیل شدهاند. کانیها با استفاده از روشهای میکروسکوپی و تجزیه ریزکاوالکترونی بررسی شدند. نتایج نشان میدهد که بلور آپاتیت اولیه بوده و احتمالاً از ماگمای نخستین با ماهیت مافیک تا فرامافیک نهشته شده است. بلورهای آپاتیت دارای منطقهبندی نامنظم از فازهای تیره و روشن هستند، بهطوری که بخشهای تیره آپاتیت غنی از میانبارهای مونازیت و زنوتیم ثانویه است. این نتایج با فرآیند انحلال- تهنشینی مجدد سازگار است. طی این فرآیند، بلورهای آپاتیت با سیالهای گرمابی تأخیری که در راستای مرزهای بلوری در حال مهاجرت بودهاند واکنش داده و تهی از عناصر خاکی نادر (REE) شدهاند. همچنین عناصر خاکی نادر دستخوش جدایش ترجیحی شدهاند، به طوری که اغلب عناصر خاکی نادر سبک (LREE) در مونازیت و عناصر نادر سنگین (HREE) در زنوتیم غنی شدهاند.
واژه‌های کلیدی: کانسارهای اکسید آهن±آپاتیت، کانیهای عناصر خاکی نادر، دگرنهادی، فرآیند انحلال- تهنشینی مجدد.
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