دوره 31، شماره 2 - ( 3-1402 )
جلد 31 شماره 2 صفحات 260-243 |
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Mehrabi B, Chaghaneh N, Tale Fazel E. Mineralization and genesis of the Pb-Zn(-Cu) non-sulfide ore in Chah Mileh deposit (NE Anarak), Central Iran. www.ijcm.ir 2023; 31 (2) :243-260
URL: http://ijcm.ir/article-1-1733-fa.html
URL: http://ijcm.ir/article-1-1733-fa.html
مهرابی بهزاد، چقانه نفیسه، طالع فاضل ابراهیم. کانه‌سازی و چگونگی پیدایش کانسنگ غیرسولفیدی سرب-روی (-مس) چاه میله (شمال‌شرق انارک)، ایران مرکزی. مجله بلورشناسی و کانی شناسی ایران. 1402; 31 (2) :243-260
بهزاد مهرابی1 
، نفیسه چقانه* 1، ابراهیم طالع فاضل2
، نفیسه چقانه* 1، ابراهیم طالع فاضل2
1- گروه زمین شیمی، دانشکده علوم زمین، دانشگاه خوارزمی، تهران، ایران
2- گروه زمینشناسی، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران
2- گروه زمینشناسی، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران
چکیده: (805 مشاهده)
کانسار سرب-روی (-مس) چاهمیله با تناژ تقریبی یک میلیون تن و عیار 15/2 درصد سرب و روی در کمربند فلززایی یزد- انارک پهنه ایران مرکزی، واقع است. کانیسازی سولفیدی اولیه شامل گالن، اسفالریت، کالکوپیریت و پیریت در واحد مرمر دولومیتی مجموعه چاهگربه به سن تریاس میانی رخ داده است. ماده معدنی اغلب با بافتهای برشی، پرکننده فضای خالی، پراکنده و جانشینی شکل گرفته است. کانسنگ غیرسولفیدی کانسار چاهمیله در اثر اکسایش برونزاد کانیهای سولفیدی اولیه طی برهمکنشهای پیچیده چون راندگی زمینساختی، گسترش کارست، تغییرات سطح ایستابی و هوازدگی، در شرایط آب هوای گرم و خشک تشکیل شده است. مهمترین کانیهای غیرسولفیدی کانسار چاهمیله سروزیت، همیمورفیت، ولفنیت، میمتیت، اسمیتزونیت، مالاکیت و اکسی- هیدروکسیدهای آهن هستند. در کانسار چاهمیله، تشکیل اسیدسولفوریک و در نتیجه کاهش pH با اکسایش پیریت و سایر کانیهای سولفیدی، افزایش فشار دی اکسید کربن (PCO2) سیالها در اثر خنثیسازی سیالهای اسیدی با سنگ میزبان کربناتی، آزادشدن یونهای سولفاتی و تهنشینی اکسی- هیدروکسیدهای آهن نقش مهمی در تشکیل کانسنگ غیرسولفیدی دارند. در شرایط اسیدی موجود، فلز روی از منطقه اکسایش مهاجرت کرده و در مناطق دورتر بهصورت کانیهای کربناتی (چون اسمیتزونیت و کمتر هیدروزنسیت با توجه به مقادیر PCO2(g)) تهنشین شده، درحالیکه فلز سرب اغلب بهصورت سروزیت در منطقه اکسایش تهنشین و یا به سطح آهن III اکسیدهای آبدار جذب شده است. براساس یافتههای زمینشناسی، بافتی و کانیشناسی، کانسنگ غیرسولفیدی چاهمیله را میتوان از گروه کانسارهای غیرسولفیدی برونزاد، زیررده کانسارهای جانشینی مستقیم (کانسنگ سرخ) در نظر گرفت.
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