ویژگی‌ های کانی سازی و سیالات درگیر ذخیره مس چینه کران (نوع مانتو) پیرمردان، جنوب غرب شاهرود

نوع مقاله : علمی- پژوهشی

نویسنده

دانشگاه صنعتی شاهرود

چکیده

محدوده معدنی پیرمردان در 130 کیلومتری جنوب­‌غرب شهرستان شاهرود و 25 کیلومتری غرب روستای ترود واقع‌شده و از نظر زمین‌شناسی در کمان ماگمایی ترود-‌چاه‌شیرین قرار‌گرفته ­است. سنگ میزبان کانی‌­سازی، شامل مجموعه­‌ای از سنگ‌های آتشفشانی و آذر­آواری ائوسن با ترکیب آندزیت، تراکی­‌آندزیت، برش آتشفشانی و توف است که متحمل دگرسانی­‌های سریسیتی-کربناتی و پروپیلیتیکی شده‌­اند. کانه­‌زایی به‌­صورت رگه­‌ای و چینه­‌کران تشکیل‌شده و دارای بافت پراکنده، پرکننده فضای خالی، داربستی و رگچه­‌ای است. کالکوسیت و مالاکیت کانه­‌های اصلی مس هستند که با مقادیری هماتیت، کالکوپیریت، پیریت، کوولیت و رگچه­‌های کلسیت و کوارتز همراه هستند. داده­‌های میان‌بارهای سیال کلسیت مربوط به مرحله کانی­‌سازی، نشان‌دهنده دمای همگن­‌شدگی 117 تا 400  درجه سانتی‌گراد و شوری بین 3/1 تا  13 درصد وزنی معادل نمک طعام است. با توجه به ویژگی­‌های زمین­‌شناسی، کانی‌­شناسی، بافت و ساخت کانسنگ و داده­‌های حاصل از میان‌بارهای سیال، کانی­‌سازی پیرمردان قابل‌مقایسه با ذخایر مس نوع مانتو است.
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