کانه زایی، ساخت و بافت و ژنز رخداد معدنی طلای حلب، جنوب باختر دندی، استان زنجان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشگاه زنجان، زنجان، ایران

2 بخش زمین‌شناسی اقتصادی، سازمان زمین‌شناسی سوئد، اوپسالا، سوئد

چکیده

کانه‌زایی در رخداد معدنی حلب به‌صورت یک پهنه سیلیسی- سولفیدی طلادار درون توالی شیست‌های مافیک پرکامبرین رخ داده است. آرسنوپیریت، اسفالریت، پیریت، کالکوپیریت، پیروتیت و طلا، کانی‌های معدنی و کوارتز، اکتینولیت، کلینوپیروکسن و کلریت، کانی‌های باطله در حلب هستند. بافت‌ کانسنگ شامل نواری،
لامینه‌ای، دانه‌پراکنده، رگچه‌ای، بِرشی، شکافه پُرکن، گل‌کلمی، جانشینی و بازماندی است. دگرسانی‌ها شامل اکتینولیتی‌، سیلیسی‌ و کلریتی‌شدن است. چهار مرحله کانه‌زایی در حلب قابل تفکیک است. کانه‌زایی طلا مربوط به مرحله گرمابی (مرحله سوم) هم‌‌زمان با تشکیل آرسنوپیریت می‌باشد. نتایج مطالعات صحرایی و آزمایشگاهی نشان می‌دهد کانه‌زایی در حلب ابتدا به‌صورت کانه‌زایی غیراقتصادی روی- مس با ژئومتری نواری- لامینه‌ای، دانه‌پراکنده و چینه‌سان-چینه‌کران هم‌زمان با فعالیت‌های آتشفشانی- رسوبی تشکیل شده است که طی فرایندهای دگرگونی-دگرشکلی بعدی، رونقش شده است. مقایسه ویژگی‌های این کانه‌زایی اولیه با انواع کانسارهای روی- مس نشان می‌دهد این کانه‌زایی معادل دگرگون- دگرشکل‌شده بخش‌های لایه‌ای و افشان کانسارهای سولفید توده‌ای آتشفشان‌زاد نوع بشی است. کانه-زایی طلا در ارتباط با یک فاز گرمابی تأخیری در ارتباط با نفوذ فازهای ماگمایی میوسن در پهنه تکاب-تخت‌سلیمان-انگوران می‌باشد. بررسی پهنه‌های دگرسانی در واحدهای دگرگونه پرکامبرین که ارتباط فضایی نزدیکی با فازهای ماگمایی میوسن دارند، کاربرد فراوانی در اکتشاف این تیپ از
کانه‌زایی‌های طلا در پهنه کانه‌دار تکاب-تخت‌سلیمان-انگوران دارد.

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