دوره 30، شماره 1 - ( 1-1401 )
جلد 30 شماره 1 صفحات 74-57 |
برگشت به فهرست نسخه ها
1- دانشگاه فردوسی مشهد
2- دانشگاه پیام نور
2- دانشگاه پیام نور
چکیده: (980 مشاهده)
منطقه اکتشافی مس ـ طلا فدیهه در شمالغربی تربتحیدریه، استان خراسان رضوی، در بخش مرکزی کمربند ماگمایی خواف-کاشمر- بردسکن قرار دارد. این منطقه شامل برونزدهایی از واحدهای آتشفشانی ـ آذرآواری به سن ائوسن با ترکیب اسیدی تا حدواسط است که گدازهها ترکیب آندزیت و لاتیت دارند و واحدهای آذرآواری شامل توف ریوداسیتی، توف سنگی آندزیتی و ایگنیمبریت هستند. تودههای نفوذی شامل هورنبلند مونزوگرانیت، سینوگرانیت، پیروکسن دیوریت پورفیری و کوارتزمونزونیت پورفیری هستند. کانیسازی کنترل ساختاری داشته و به شکل رگه ـ رگچهای در راستای روند اصلی گسلهای منطقه شمال غربی- جنوب شرقی (NW-SE) و شمال شرقی- جنوب غربی (NE-SW) تشکیل شده است. رگههای کانیسازی با راستای °75 شرقی- °45 شمالی و °30 غربی° 15 شمالی، طول 2 تا 25 متر و ضخامت 2/0 تا 2متر دارند. مهمترین رگههای منطقه شامل کوارتز+اسپیکیولاریت ±پیریت و کوارتز+ اسپیکیولاریت± کالکوپیریت هستند. سنگ میزبان شامل پیروکسن دیوریت پورفیری، کوارتزمونزونیت پورفیری و هورنبلند مونزوگرانیت است. ساخت و بافت کانیسازی شامل رگه ـ رگچه، پرکننده فضای خالی، برشی، جانشینی ثانویه، گل کلمی و پراکنده است. دگرسانی رگههای کانیسازی سیلیسی و کلریتی است. دگرسانیهای پروپیلیتی، سیلیسی، کلریتی و آرژیلی در سنگهای میزبان و دیگر واحدهای سنگی منطقه دیده میشود. کانیهای اولیه شامل اسپیکیولاریت، کالکوپیریت، پیریت و گالن و کانیهای ثانویه شامل مالاکیت، کالکوزیت، کوولیت, گوتیت، هماتیت، لیمونیت، آزوریت و کریزوکلا هستند. بیشترین بیهنجاریهای زمین شیمی در رگهها برای مس تا 5%، سرب تا 3%، نقره 50 گرم در تن ، آرسنیک 100گرم در تن و طلا تا 791 میلی گرم در تن است. براساس موقعیت زمینشناسی، سنگشناسی، کانیشناسی رگههای کانیسازی، ساخت و بافت، گسترش و نوع دگرسانی، کانیسازی در منطقه اکتشافی فدیهه از نوع مس- طلا همراه با اکسید آهن (IOCG) است.
واژه‌های کلیدی: ساخت و بافت، دگرسانی، کانیسازی، زمین شیمی، کانسارهای مس ـ طلا همراه با اکسید آهن، کمربند ماگمایی خواف ـ کاشمرـ بردسکن.
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