کانه زایی، کانی شناسی، ساخت و بافت و ژنز کانسار سرب و روی اورتاسو، شمال غرب زنجان

زمین شناسی اقتصادی

مقاله 1، دوره 11، شماره 3 - شماره پیاپی 22، 1398، صفحه 359-386   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v11i3.68921

نویسندگان

آرشام حقیقی بردینه؛ قاسم نباتیان^* ؛ حسین کوهستانی؛ امیرمرتضی عظیم زاده؛ افشین زهدی

دانشگاه زنجان

چکیده

کانسار سرب و روی اورتاسو، در شمال­‌غرب زنجان و در پهنه­ ایران مرکزی قرار‌گرفته است. در این منطقه سازندهای کهر، شمشک، قرمز زیرین، قم و قرمز بالایی گسترش‌ دارند. سازند قرمز بالایی که میزبان کانه‌­زایی در این منطقه به­‌شمار می‌­رود، شامل تناوبی از مارن، سیلت‌سنگ، ماسه­‌سنگ­‌های قرمز و خاکستری‌ رنگ و کنگلومراست. کانه‌زایی چینه‌­سان سرب و روی درون ماسه‌­سنگ­‌های لیت­‌آرنایتی (اغلب چرت­آرنایت) خاکستری‌ رنگ دارای مواد آلی، رخ‌داده است. در کانسار اورتاسو دو افق کانه‌­زایی قابل‌شناسایی است که هر‌یک از آنها  از دو پهنه­ سرخ اکسیدان و شسته‌شده و یک زیرپهنه­ کانه‌­زایی تشکیل‌شده است. کانه­‌های اصلی تشکیل‌دهنده کانه­‌زایی شامل گالن، اسفالریت، پیریت و کالکوپیریت هستند که کانی­‌های ثانویه از جمله اکسیدهای آهن، کالکوسیت، کوولیت و سروزیت طی فرایندهای برون‌­زاد و هوازدگی جانشین آنها شده‌­اند. بافت­‌های غالب در این کانسار شامل بافت­‌های شبه­ لامینه­‌ای، دانه­‌پراکنده، پیریت فرامبوئیدال و سیمان بین­‌بلوری هستند. بررسی‌های زمین­‌شیمیایی انجام‌شده بر روی نمونه‌­های ماسه‌­سنگی، نشان­‌دهنده­ آن است که ماسه‌سنگ­‌های این منطقه در محیط­‌های حاشیه فعال قاره­‌ای ته‌­نشست کرده‌­اند. این ماسه‌­سنگ­‌ها از سنگ­‌های ماگمایی با ترکیب فلسیک منشأ گرفته و در محیطی دارای شرایط آب و هوایی خشک ته‌­نشست کرده­‌اند. بررسی‌های انجام‌­شده از جمله سنگ‌­شناسی، چینه­‌شناسی، کانی­‌شناسی، ساخت و بافت و عوامل کنترل­‌کننده کانه‌­زایی (وجود آثار و بقایای گیاهی، وجود گنبدهای نمکی، نفوذپذیری مناسب سنگ ­میزبان، گسل­‌ها و شکستگی­‌ها)، بیانگر آن است که کانسار اورتاسو شباهت زیادی با بخش دیستال کانسارهای مس رسوبی نوع Redbed دارد.

کلیدواژه‌ها

سازند قرمز بالایی؛ کانسار مس رسوبی؛ تیپ Redbed؛ اورتاسو؛ زنجان؛ ایران مرکزی

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