مجله علوم، مهندسی و فناوری هسته‌ای

مطالعات کانی‌شناسی کانی‌های اورانیل با میکروسکوپ الکترونی نشر میدانی در کانسار آنومالی 6 خشومی (بلوک 1)، کمربند فلززایی بافق- ساغند

نوع مقاله : مقاله پژوهشی

نویسندگان

خالق خشنودی
سمانه ضیاپور

پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران- ایران

https://doi.org/10.24200/nst.2024.1594.2030
چکیده
آنومالی 6 خشومی یکی از کانسارهای مهم اورانیم در پهنه فلززایی بافق- ساغند در زون ایران مرکزی است. گنیس سنگ میزبان اصلی کانی‌سازی اورانیم در بلوک 1 آنومالی 6 خشومی است و براساس مطالعات میکروسکوپ الکترونی نشر میدانی دو مرحله کانی‌سازی اورانیم شامل کانی‌سازی اولیه (هیپوژن) و سیلیکات اورانیل (سوپرژن) مشاهده گردید. کانی‌های اورانیم اولیه در منطقه هیپوژن شامل اورانینیت همراه با مقادیر فرعی تورواورانینیت، برانریت و اورانوتوریت است. کانی‌سازی سیلیکات اورانیل در امتداد شکستگی‌ها به صورت بولتوودیت و سدیئیت رخ داده که در ادامه بولتوودیت تحت تأثیر دگرسانی به سدیم- بولتوودیت و اورانوفان تبدیل شده‌ است. براساس شواهد صحرایی و مطالعات کانی‌شناسی، احتمالاً سیالات با منشأ جوی با pH خنثی تا قلیایی و دمای پایین در گردش، اورانیم، سیلیسیم، پتاسیم، سدیم و کلسیم را از گنیس شسته و در امتداد شکستگی‌ها به صورت کانی‌های سیلیکات اورانیل همراه با کلسیت، رس و کلریت نهشته کرده‌اند. وجود کلسیت پاراژنز همراه با سیلیکات‌های اورانیل بیانگر حمل اورانیم به صورت کمپلکس‌های کربنات اورانیل در سیال است.

کلیدواژه‌ها

اورانیم
سیلیکات اورانیل
خشومی
بافق- ساغند

عنوان مقاله English

Mineralogical studies of uranyl minerals with field emission electron microscope in the Khoshoumi Anomaly 6 deposit (Block 1), Bafq-Saghand metallogenic belt

نویسندگان English

Kh. Khoshnoodi
S. Ziapour
Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486, Tehran - Iran
چکیده English

Khoshoumi Anomaly 6 is a significant uranium deposit located in the Bafq-Saghand metallogenic belt within the Central Iran zone. The gneiss serves as the primary host for uranium mineralization in block 1 of Khoshoumi Anomaly 6. Field emission electron microscopy studies have identified two stages of uranium mineralization within the area: primary mineralization (hypogene) and uranyl silicate (supergene). Primary uranium minerals found in the hypogene zone include uraninite, with minor amounts of thorouraninite, brannerite, and uranothorite. Uranyl silicate mineralization is observed along fractures in the form of boltwoodite and soddyite. Over time, boltwoodite undergoes alteration into sodium-boltwoodite and uranophane. Field evidence and mineralogical studies suggest that meteoric fluids, with a neutral to alkaline pH and low temperature, played a role in leaching uranium, silicon, potassium, sodium, and calcium from the gneiss. These elements were then deposited along fractures as uranyl silicate minerals, accompanied by calcite, clay, and chlorite. The presence of calcite alongside uranyl silicates indicates the transport of uranium in the form of uranyl carbonate complexes within the fluid.

کلیدواژه‌ها English

Uranium
Uranyl silicate
Khoshoumi
Bafq-Saghand
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