کانه زایی، ساخت، بافت و خاستگاه کانسار سرب-‌روی و مس با میزبان رسوبی چهرآباد، شمال باختر زنجان

زمین شناسی اقتصادی

مقاله 3، دوره 12، شماره 2 - شماره پیاپی 25، 1399، صفحه 177-202   

نوع مقاله: علمی- پژوهشی

شناسه دیجیتال (DOI): 10.22067/econg.v12i2.74819

نویسندگان

علی رجب زاده؛ حسین کوهستانی^* ؛ میر علی اصغر مختاری؛ افشین زهدی

دانشگاه زنجان

چکیده

کانسار چهرآباد در پهنه­ ایران مرکزی و در فاصله­ 75 کیلومتری شمال ­باختر زنجان قرار‌ دارد. سنگ میزبان کانه­ زایی در این کانسار، واحدهای ماسه­ سنگی خاکستری‌رنگ دارای مواد آلی متعلق به سازند قرمز بالایی است. کانه ­زایی سرب-‌روی و مس در کانسار چهرآباد در دو افق ماسه­ سنگی مجزا به­ صورت لامینه­ ای و عدسی­ شکل هم ­روند با لایه ­بندی سنگ میزبان رخ‌داده و دارای بافت­ های دانه­ پراکنده، سیمان بین­ دانه ­ای، عدسی، شبه لامینه­ ای، جانشینی، رگچه­ ای و فرامبوئیدال است. در هر‌یک از افق­ های کانه ­دار، سه پهنه قرمز اکسیدان، شسته ­شده و احیایی کانه ­دار تشکیل‌شده است. گالن، اسفالریت، کالکوسیت، پیریت و کالکوپیریت، کانی­ شناسی اصلی ماده­ معدنی را در کانسار چهرآباد تشکیل می­ دهند که با اندکی کانی­ های نقره­ دار (مکینسترایت و استرامیرایت) همراهی می­ شوند. سروزیت، مالاکیت، آزوریت، کوولیت، آتاکامیت، وانادینیت و گوتیت طی فرایندهای برون­ زاد تشکیل شده ­اند. با توجه به ویژگی ­هایی مانند محیط زمین‌ساختی، سنگ­ شناسی، چینه­ شناسی، کانی ­شناسی، ساخت و بافت و عوامل کنترل­ کننده کانه­ زایی (وجود آثار و بقایای گیاهی، وجود گنبدهای نمکی، تخلخل و نفوذپذیری مناسب سنگ ­میزبان، گسل­ ها و شکستگی­ ها)، کانسار چهرآباد در دسته­ کانسارهای مس رسوبی نوع Redbed قرار‌گرفته و از این نظر قابل‌مقایسه با دیگر کانسارهای مس رسوبی نوع Redbed در منطقه ماه­ نشان مانند چرلانقوش، اورتاسو، حلب و حمزه ­لو است. این کانسارها، ارتباط فضایی نزدیکی با واحدهای تبخیری و گنبدهای نمکی موجود در سازند قرمز بالایی دارند که باید در بررسی‌های اکتشافی مورد‌توجه قرار‌گیرد.

کلیدواژه‌ها

کانه زایی مس با میزبان رسوبی؛ تیپ Redbed؛ سازند قرمز بالایی؛ چهرآباد؛ زنجان

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