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معصومه محمدی قاسم نباتیان مریم هنرمند محمد ابراهیمی

چکیده

کانسار مس دهنه در فاصله 84 کیلومتری شمال­‌خاور زنجان، در پهنه­ البرز باختری-‌آذربایجان و زیرپهنه­­ طارم قرارگرفته است. سنگ­‌های رخنمون‌­یافته در منطقه دهنه، مجموعه‌ا­ی از سنگ­‌های ­آتشفشانی و آتشفشانی-‌رسوبی ائوسن (معادل سازند کرج) شامل واحدهای توف­ و گدازه‌های بازالت پورفیری و بازالت آمیگدالوئیدال هستند. بررسی‌های ژئوشیمیایی نشان می­‌دهد که سنگ­‌های آتشفشانی منطقه دهنه دارای ترکیب بازالتی با ماهیت شوشونیتی بوده و در محیط­ زمین‌ساختی مرتبط با فرورانش تشکیل شده‌­اند. کانه‌­زایی مس در منطقه دهنه به‌صورت رگه-‌رگچه­‌ای در درون واحدهای گدازه­ بازالتی رخ‌­داده است. بر اساس بررسی‌های میکروسکوپی انجام‌شده، کانه­‌های موجود در منطقه مورد بررسی شامل مس­­ طبیعی، نقره طبیعی، کوپریت و به مقدار کمتر مالاکیت و ­آزوریت است. عمده­‌ترین دگرسانی­‌های موجود در این منطقه شامل کربناتی­، کلریتی-‌اپیدوتی، سریسیتی و زئولیتی است. بافت کانه‌ها شامل رگه­-‌رگچه­‌ای، پرکننده فضای­‌ خالی، بازماندی (جزیره‌­ای) و جانشینی است. بررسی‌های انجام‌شده در محدوده دهنه نشان می­‌دهد که فرایند دیاژنز و دگرگونی تدفینی در توالی آتشفشانی میزبان­ کانه­‌زایی، سبب ایجاد سیال­‌های نسبتاً داغ شده است که با چرخش این سیالات، مس و نقره از سنگ­‌های آتشفشانی و آتشفشانی-‌رسوبی ائوسن شسته‌شده و تحت‌ شرایط اکسیدی در واحد­های ­بازالتی ته‌­نشست شده‌­اند. در ادامه و در اثر فرایندهای سوپرژن و هوازدگی، کانی­‌های معدنی اولیه (مس طبیعی) به کانی­‌های ثانویه از جمله کوپریت، مالاکیت و آزوریت تبدیل شده‌اند. با توجه به نوع سنگ­ میزبان، کانی‌­شناسی و دگرسانی می­‌توان اظهار داشت که کانه‌­زایی مس در کانسار دهنه شباهت زیادی با کانسارهای مس مرتبط با سنگ­‌های بازالتی (نوع میشیگان) دارد.

جزئیات مقاله

کلمات کلیدی

کانه زایی مس, نوع میشیگان, پهنه البرز باختری-‌آذربایجان, زیرپهنه طارم, دهنه, زنجان

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ارجاع به مقاله
محمدیم., نباتیانق., هنرمندم., & ابراهیمیم. (2019). زمین شناسی و خاستگاه کانه زایی مس در کانسار دهنه، شمال خاور زنجان. زمین‌شناسی اقتصادی, 11(3), 497-524. https://doi.org/10.22067/econg.v11i3.71939
نوع مقاله
علمی- پژوهشی