تحلیل ساختاری کانسار سنگ‌آهن اختاچی با استفاده از روش مغناطیس‌سنجی، باختر همدان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده علوم زمین، گروه زمین شناسی، دانشگاه بوعلی‌‌سینا، همدان، ایران

2 دانشکده علوم زمین، گروه زمین‌شناسی، دانشگاه بوعلی‌‌سینا، همدان، ایران

چکیده

کانسار سنگ‌آهن اختاچی در باختر همدان و در پهنه دگرگونی سنندج - سیرجان واقع شده است. به منظورارتباط کانه‌زایی با زمین‌ساخت و نقش عناصر ساختاری در تمرکز ماده معدنی در این کانسار از مطالعات صحرایی، روش مغناطیس‌سنجی و دورسنجی استفاده شده است. بر این اساس با استفاده از مطالعه تصاویر ماهواره‌‌ای با قدرت تفکیک مکانی بالا دو دسته ساختار خطی با امتداد NE-SW و NW-SE، در محدوده مورد مطالعه شناسایی گردید. سپس یک شبکه برداشت جهت مطالعات مغناطیس‌سنجی انتخاب و نقشه‌های شدت میدان مغناطیسی کل، میدان باقیمانده، مشتقات قائم میدان مغناطیسی، گسترش به بالا در ارتفاعات مختلف، برگردان به قطب برای محدوده‌ مورد مطالعه ترسیم گردید. با طراحی تعدادی پروفیل بر روی آنومالی‌ها و مدل‌سازی معکوس، ابعاد و امتداد محدوده‌های سنگ‌آهن و روند کانی‌زایی به صورت خطی با امتداد NW-SE مشخص شده است. باتوجه به روندهای خطی کانی‌سازی در مطالعات مغناطیس‌سنجی، به نظر می‌رسد که کانی‌سازی بیشتر در راستای شکستگی‌های موجود در منطقه شکل گرفته است. در واقع با شناسایی گسل‌های منطقه مورد مطالعه و به نقشه درآوردن نقاط پرعیار آهن این نتیجه حاصل گردید که تمامی نقاط پرعیار آهن در پهنه‌های گسلی کانسار متمرکز و امتداد ذخایر سنگ‌آهن با گسل‌های فرعی دارای امتداد NW-SE کاملاً مطابقت دارند.

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