علوم زمین خوارزمی

علوم زمین خوارزمی

زمین‌شناسی، ژئوشیمی و کانه‌زایی در کانسار مس کردکندی، شمال‌غرب زنجان

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشگاه زنجان
2 دانشگاه علوم پایه تحصیلات تکمیلی زنجان
چکیده
کانسار کردکندی در 26 کیلومتری شمال‌غرب زنجان و در پهنه البرز غربی- آذربایجان و زیرپهنه طارم به صورت چینه کران در میان واحدهای گدازه‌ای آندزیت- بازالت به سن ائوسن (معادل سازند کرج) رخ داده است. کانی‌سازی مس در این کانسار بیشتر به صورت کانی‌های سولفیدی شامل کالکوپیریت، بورنیت، کالکوسیت و به مقدار کمتر پیریت و هماتیت اسپکیولار با بافت دانه پراکنده، رگه- رگچه‌ای و جانشینی مشاهده می‌شود. سنگ‌های آتشفشانی این منطقه در یک محیط کششی و پشت کمانی و ترکیب کالک‌آلکالن تا کالک‌آلکالن پتاسیم بالا تا شوشونیتی (مقادیر K2O برابر با 13/1 تا 31/2 درصد وزنی و مقادیر Na2O برابر با 93/1 تا 15/2 درصد وزنی) قرار می‌گیرند. براساس شواهد بدست آمده می‌توان گفت که کانسار مس کردکندی در طی مراحل دگرگونی تدفینی در واحدهای آندزیت- بازالت تشکیل شده است. در طی این مرحله، با افزایش عمق تدفین، کانه‌زایی مس به همراه دگرسانی‌هایی از جمله زئولیتی، کلریتی، اپیدوتی، سیلیسی و کربناتی صورت گرفته است. بر اساس ویژگی‌های سنگ میزبان، کانی‌شناسی، ساخت و بافت، ژئومتری و دگرسانی، این کانسار شباهت فراوانی با کانسارهای تیپ مانتو در شیلی دارد.
کلیدواژه‌ها
موضوعات

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